CN118174562A - Switch reluctance motor power converter and control method thereof - Google Patents

Switch reluctance motor power converter and control method thereof Download PDF

Info

Publication number
CN118174562A
CN118174562A CN202410244774.2A CN202410244774A CN118174562A CN 118174562 A CN118174562 A CN 118174562A CN 202410244774 A CN202410244774 A CN 202410244774A CN 118174562 A CN118174562 A CN 118174562A
Authority
CN
China
Prior art keywords
diode
switching tube
capacitor
inductor
phase winding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202410244774.2A
Other languages
Chinese (zh)
Inventor
孙冠群
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CHINA JILIANG UNIVERSITY COLLEGE OF MODERN SCIENCE AND TECHNOLOGY
Original Assignee
CHINA JILIANG UNIVERSITY COLLEGE OF MODERN SCIENCE AND TECHNOLOGY
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CHINA JILIANG UNIVERSITY COLLEGE OF MODERN SCIENCE AND TECHNOLOGY filed Critical CHINA JILIANG UNIVERSITY COLLEGE OF MODERN SCIENCE AND TECHNOLOGY
Priority to CN202410244774.2A priority Critical patent/CN118174562A/en
Publication of CN118174562A publication Critical patent/CN118174562A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H02J1/12—Parallel operation of dc generators with converters, e.g. with mercury-arc rectifier
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
    • H02P25/08—Reluctance motors
    • H02P25/092—Converters specially adapted for controlling reluctance motors
    • H02P25/0925—Converters specially adapted for controlling reluctance motors wherein the converter comprises only one switch per phase
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
    • H02P9/26—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices
    • H02P9/30—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices using semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

The power converter consists of a main circuit and a power circuit, wherein the number of switching tubes of the main circuit is only one more than that of windings, the main circuit can be used as a motor to operate on the basis that the power circuit works forward to provide power, the switching reluctance motor can directly output continuous direct current and high voltage when being used as a generator, the power circuit can provide an adjustable continuous current power supply for the switching reluctance motor as the motor when working forward, the switching reluctance motor as the generator can provide a continuous current power supply with variable exciting voltage, and the storage battery can be automatically and continuously charged, the power circuit can feed back the electric energy of the storage battery to a power grid needing the electric energy in the reverse direction, and the power circuit only has two switching tube switches to operate when working, and the system has no isolation link and is commonly grounded; the method is suitable for being applied as a main motor in the field of local direct current micro-grid mainly comprising clean energy power generation systems such as wind power generation and pumped storage power stations.

Description

Switch reluctance motor power converter and control method thereof
Technical Field
The invention relates to the field of clean energy power generation systems, in particular to a novel multifunctional switch reluctance motor power converter with direct boosting, variable excitation, few switches and double power supply feed and a control method thereof.
Background
Wind energy and solar energy are used as clean energy forms of main force, are widely used all over the world more and more, and are particularly used for power generation; in China, besides the rapid development of wind power generation and solar photovoltaic power generation, in view of the characteristic that the load of an electric power system is unbalanced in power consumption at different times, the pumped storage power station project of a balanced power grid is built by continuous investment in various places in recent years, and the system is also a peak clipping and valley filling form of clean energy.
Because wind energy and solar energy change along with the change of climate, after the wind energy and solar energy are introduced into the pumped storage power station, the stability of the power grid is enhanced in the power grid formed by the wind power generation system and the photovoltaic power generation system.
At present, a direct current micro-grid mainly composed of wind power generation and photovoltaic power generation develops rapidly, and for a wind power generation system, a traditional wind power generator is a permanent magnet synchronous generator or an asynchronous generator, and the traditional wind power generator directly generates alternating current and can be integrated into the grid only through a rectifying link and a boosting link; the power generation/motor system of the pumped storage power station is also an alternating current motor, and the same link before grid connection exists.
The switch reluctance motor is used as a motor type with a special structure, can directly generate direct current, can be used as a motor and a generator for four-quadrant operation, is only different in power-on angle when in different rotor positions, is simple and flexible to control, but the traditional asymmetric half-bridge type converter (power converter) is required to have a large number of switching tubes, and has the problems that the output direct current voltage is low, a boosting link needs to be added and the like.
The field of power converters of switched reluctance motors also has a number of novel topological structure types at present, including adding an excitation circuit link on the basis of a novel main circuit, realizing variable excitation when being used as a generator, and controlling the rotating speed and the power when being used as a motor by adjusting a power supply.
In a switched reluctance motor power converter topology consisting of a main circuit and an auxiliary circuit (e.g., an excitation circuit), the industry often requires isolation links, such as the use of an isolation transformer, which increases the bulk weight and cost of the system, and increases losses.
In a direct current power grid system mainly composed of clean energy, the direct current power grid system is used as a wind power generation and pumped storage power station, the same motor is often required to run in four quadrants, if the same power converter can realize four-quadrant regulation and control application, the utilization rate and the cost performance are improved, and meanwhile, for wind power generation, maximum power tracking (MPPT) control and low voltage ride through, more various and flexible controllable structures and methods are also required.
Disclosure of Invention
According to the background technology, the invention provides a novel power converter which directly outputs direct current, directly increases voltage output, has variable exciting voltage, continuous exciting current, self-starting capability, self-charging of a storage battery, energy feedback of a reverse direct current power grid, no isolation link in common ground, four-quadrant operation, less switching tube consumption and is suitable for a medium-small power switch reluctance motor or a switch reluctance generator, and a control method thereof, and is suitable for the field of direct current power grids represented by grid connection of wind power generation and pumped storage power stations.
The technical scheme of the invention is as follows:
A power converter of a switch reluctance motor is composed of a main circuit and a power circuit, wherein the main circuit outputs electric energy to a direct current power grid, the output two ends of the main circuit are simultaneously used as the input two ends of the power circuit when working positively, and the output two ends of the power circuit working positively are used as the input two ends of the main circuit.
The main circuit is composed of a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a first phase winding, a second phase winding, a third phase winding, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a first capacitor, a second capacitor, a third capacitor, a first inductor, a second inductor and a third inductor, wherein the anode of the first switch tube is connected with the anode of the second switch tube and the anode of the third switch Guan Yangji and is used as an input positive electrode of the main circuit, the cathode of the first switch tube is connected with one end of the first phase winding, the cathode of the second switch tube is connected with one end of the second phase winding, the cathode of the third switch tube is connected with one end of the third phase winding, the other end of the first phase winding is connected with the other end of the second phase winding, the other end of the third diode, the anode of the first diode and the anode of the second diode, the first diode cathode is connected with one end of the first capacitor and one end of the first inductor, the cathode of the second diode is connected with the other end of the second inductor, the anode of the fourth switch tube and the anode of the fifth diode, the cathode of the fifth diode is connected with the other end of the second inductor, the third diode is connected with the third inductor, the third end of the third inductor and the third diode is connected with the other end of the third inductor and the third end of the third diode, the third diode is connected with the third end of the third inductor and the third diode and the third end of the third diode is connected with the positive end of the third end of the main circuit.
The power supply circuit comprises a fifth switch tube, a sixth switch tube, a seventh switch tube, an eighth switch tube, a ninth switch tube, a sixth diode, a seventh diode, an eighth diode, a ninth diode, a tenth diode, a fourth capacitor, a fifth capacitor, a sixth capacitor, a fourth inductor, a fifth inductor and a storage battery, wherein one end of the fourth capacitor is connected with the eighth switch Guan Yangji and the cathode of the ninth diode and is used as the positive input positive terminal of the power supply circuit to be connected with the positive output terminal of the main circuit, the cathode of the eighth switch tube is connected with the anode of the ninth diode, the cathode of the sixth switch Guan Yangji, the cathode of the seventh diode and one end of the fifth inductor, the other end of the fifth inductor is connected with the anode of the seventh switch Guan Yangji, the cathode of the eighth diode and one end of the fifth capacitor, the other end of the fifth capacitor is connected with a cathode of a fifth switch tube, an anode of a sixth diode and one end of a fourth inductor, the anode of the fifth switch tube is connected with the cathode of the sixth diode, one end of the sixth capacitor, the cathode of the seventh switch tube, the anode of the eighth diode, the cathode of the ninth switch tube and the anode of the tenth diode, and is used as a positive output positive end of a power circuit to be connected with an input positive end of a main circuit, the anode of the ninth switch tube is connected with the cathode of the tenth diode and the anode of a storage battery, the cathode of the storage battery is connected with the other end of the sixth capacitor, the other end of the fourth inductor, the cathode of the sixth switch tube, the anode of the seventh diode and the other end of the fourth capacitor, and is used as a positive input negative end and an output negative end of the power circuit to be connected with the input negative end and the output negative end of the main circuit, and the fourth inductor is magnetically coupled with the fifth inductor; the positive output end of the power circuit in the reverse operation is the positive input end in the positive operation, the positive input end in the reverse operation is the positive output end in the positive operation, the negative output end in the reverse operation is the positive input end in the positive operation, and all the negative terminals are short-circuited.
According to the control method of the power converter of the switched reluctance motor, when the switched reluctance motor is operated as a motor, a power circuit positively works to provide power, and the motor of the switched reluctance motor works in the process of: according to the basic theory of a switched reluctance motor, when a first phase winding needs to be put into operation according to rotor position information, a first switching tube and a fourth switching tube are simultaneously closed and conducted, a first diode, a fourth diode and a fifth diode are cut off, a power supply circuit outputs electric energy positively to supply power to the first phase winding through the first switching tube, the second diode and the fourth switching tube, energy stored by a first capacitor is released to a first inductor and is charged to a second capacitor through a second inductor, when the operation of the first phase winding needs to be finished according to rotor position information, the fourth switching tube is firstly disconnected, the second diode and a third diode are cut off, residual energy stored by the first phase winding is charged to the first capacitor, the first inductor and the third capacitor are charged simultaneously, the second capacitor is charged through the third inductor, and when the current of the first phase winding is reduced to zero, the first switching tube is disconnected, and the operation of the first phase winding is finished; when the second phase winding needs to be put into operation according to rotor position information, the second switching tube and the fourth switching tube are simultaneously closed and conducted, the first diode, the fourth diode and the fifth diode are cut off, the power supply circuit outputs electric energy positively to supply power to the second phase winding through the second switching tube, the second diode and the fourth switching tube, the first capacitor stores energy to be released to the first inductor and charges the second capacitor through the second inductor, when the second phase winding needs to be finished according to rotor position information, the fourth switching tube is firstly disconnected, the second diode and the third diode are cut off, the residual energy of the second phase winding charges the first capacitor and charges the first inductor and the third capacitor simultaneously, and charges the second capacitor through the third inductor, and when the second phase winding current is reduced to zero, the second switching tube is disconnected, and the second phase winding is finished; when the third phase winding needs to be put into operation according to the rotor position information, the third switching tube and the fourth switching tube are simultaneously closed and conducted, the first diode, the fourth diode and the fifth diode are cut off, the power supply circuit outputs electric energy positively to supply power to the third phase winding through the third switching tube, the second diode and the fourth switching tube, the first capacitor stores energy to be released to the first inductor and charges to the second capacitor through the second inductor, when the third phase winding needs to be operated according to the rotor position information, the fourth switching tube is firstly disconnected, the second diode and the third diode are cut off, the residual energy of the third phase winding charges to the first capacitor and charges to the first inductor and the third capacitor simultaneously, and charges to the second capacitor through the third inductor, and when the current of the third phase winding is reduced to zero, the third switching tube is disconnected, and the third phase winding is operated.
When the switch reluctance motor operates as a generator, the power circuit positively works to provide exciting power, and the generator of the switch reluctance motor works in the process: according to the basic theory of the switch reluctance generator, when the first phase winding needs to be put into operation according to the rotor position information, the first switch tube and the fourth switch tube are simultaneously closed and conducted, the first diode, the fourth diode and the fifth diode are cut off, electric energy positively output by the power supply circuit is excited and supplied to the first phase winding through the first switch tube, the second diode and the fourth switch tube, the excitation phase is entered, the energy stored in the first capacitor is released to the first inductor through the fourth switch tube, and the second capacitor is charged and output through the second inductor, when the excitation phase is needed to be ended according to the rotor position information, the fourth switching tube is disconnected, the power generation phase of the first phase winding is started, at the moment, the second diode and the third diode bear back pressure to cut off, the first phase winding, the first inductor and the excitation power supply at the input end are connected in series to charge the third capacitor together through the first switching tube, the first diode and the fifth diode, and simultaneously output electric energy, in addition, the excitation power supply and the first phase winding are connected in series to charge the first capacitor through the first switching tube and the first diode, the third inductor is connected to charge the second capacitor through the fourth diode and output, when the working of the first phase winding is needed to be ended according to the rotor position information, the first switching tube is disconnected, and the work of the first phase winding is finished; when the second phase winding needs to be put into operation according to the rotor position information, the second switching tube and the fourth switching tube are simultaneously closed and conducted, the first diode, the fourth diode and the fifth diode are cut off, electric energy positively output by the power supply circuit is excited and supplied to the second phase winding through the second switching tube, the second diode and the fourth switching tube and enters an excitation stage, at the moment, energy stored in the first capacitor is released to the first inductor through the fourth switching tube, and is charged and output to the second capacitor through the second inductor, when the excitation stage needs to be finished according to the rotor position information, the fourth switching tube is opened, the power generation stage of the second phase winding is started, at the moment, the second diode and the third diode bear back pressure and are cut off, the second phase winding, the first inductor and the exciting power supply at the input end are connected in series to charge the third capacitor through the second switching tube, the first diode and the fifth diode together, and simultaneously output electric energy; when the third phase winding needs to be put into operation according to the rotor position information, the third switching tube and the fourth switching tube are simultaneously closed and conducted, the first diode, the fourth diode and the fifth diode are cut off, electric energy positively output by the power supply circuit is excited and supplied to the third phase winding through the third switching tube, the second diode and the fourth switching tube and enters an excitation stage, at the moment, energy stored in the first capacitor is released to the first inductor through the fourth switching tube, and is charged and output to the second capacitor through the second inductor, when the excitation stage needs to be finished according to the rotor position information, the fourth switching tube is opened, the power generation stage of the third phase winding is entered, at the moment, the second diode and the third diode bear back pressure and are cut off, the third phase winding, the first inductor and the exciting power supply at the input end are connected in series to charge the third capacitor through the third switching tube, the first diode and the fifth diode together, and simultaneously output electric energy.
The storage battery is automatically charged through the tenth diode at the same time as long as the power supply circuit absorbs the electric energy of the power grid to work in the forward direction no matter the switch reluctance motor is used as a generator or a motor to operate.
The control process of the power supply circuit when the power supply circuit absorbs the electric energy of the output end of the main circuit, namely the direct current power grid, as input in the forward working is as follows: the fifth switching tube and the sixth switching tube are always in an off state, the seventh switching tube and the eighth switching tube synchronously switch according to a PWM mode, the duty ratio is alpha Z, when the seventh switching tube and the eighth switching tube are closed and conducted, the sixth diode, the seventh diode, the eighth diode and the ninth diode are cut off, the electric energy of the power grid charges and outputs the fifth inductor and the storage battery through the seventh switching tube and the eighth switching tube, and meanwhile, the fifth capacitor discharges and charges and outputs the storage battery through the fourth inductor; when the seventh switching tube and the eighth switching tube are disconnected, the eighth diode and the ninth diode are continuously turned off, the sixth diode and the seventh diode are turned on, the fifth inductor charges the fifth capacitor and simultaneously outputs the output end and charges the storage battery, and the fourth inductor also outputs the output end and charges the storage battery; according to the principle of volt-second balance of inductance, the relation between the output end voltage U L and the input end voltage U F when the power supply circuit works in the forward direction can be deduced as follows:
By adjusting alpha Z, the U L value can be changed, and when the switch reluctance motor is used as a generator, U L is exciting voltage, so that variable excitation control can be realized; when the switched reluctance motor operates as a motor, U L is the power supply voltage, and the control of the rotating speed and the power of the switched reluctance motor can be realized by changing U L.
The power supply circuit can work reversely, the electric energy feedback of the storage battery is provided for the power grid, and the control process of the energy feedback work of the power supply circuit is as follows: the ninth switching tube is always in a closed and conducting state, the seventh switching tube and the eighth switching tube are always in an open state, the fifth switching tube and the sixth switching tube synchronously switch according to a PWM mode, the duty ratio is alpha F, when the fifth switching tube and the sixth switching tube are closed and conducted, the sixth diode, the seventh diode, the eighth diode, the ninth diode and the twelfth diode are cut off, and the storage battery and the fifth capacitor are connected in series to charge the fifth inductor; when the fifth switching tube and the sixth switching tube are turned off, the sixth diode, the seventh diode and the twelfth diode are still turned off, the eighth diode and the ninth diode are turned on, the storage battery and the fifth inductor are connected in series to charge the fourth capacitor and output the fourth capacitor to the power grid, and the storage battery also charges the fifth capacitor; according to the volt-second balance principle of the fifth inductor and the charge-discharge balance relation of the fifth capacitor, the relation between the output terminal voltage U F and the input terminal voltage U L when the power circuit works reversely can be deduced as follows:
The duty cycle alpha F can be adjusted to suit the requirements.
The invention has the technical effects that:
When the main circuit of the invention operates as a switched reluctance generator, the main circuit directly generates direct current, directly outputs high voltage relative to exciting voltage, omits a rectifying link and reduces a boosting link before being integrated into a direct current power grid.
The number of switching tubes needed by the main circuit is the number of windings plus 1, and the power circuit has five switching tubes, but only two switching tubes perform switching operation during operation, so the total switching loss is not high.
The main circuit and the power circuit are grounded together, and an isolation link is omitted, so that the volume, the weight and the cost are saved, and loss caused by the isolation link is avoided.
When the main circuit works, output is carried out at two stages, the output electric energy quality is higher, the pressure of a filtering link is reduced, and the stability of a power grid is facilitated; when the power supply circuit works in the forward direction, the variable voltage is output, the current is continuous, the quality is high, and the stable power supply for the switched reluctance motor and the charging for the storage battery are facilitated.
Under the support of the power converter structure and the control method, the switch reluctance motor (1) can be used as a motor, can be operated by double-guarantee power supply of a power grid or a storage battery, especially can be used as an energy consumption equipment motor of a pumped storage power station, or has low power grid load and needs to be discharged when in wind power driving, and can be used as a generator to be powered by the storage battery or the power grid when in starting; (2) The switch reluctance motor can be used as a generator to operate, and the exciting power supply can be from the power grid, namely the electric energy output by the main circuit, can be excited by the storage battery, and can be supplied by the storage battery during starting; (3) The power supply circuit can utilize the electric energy in the storage battery to reversely work to feed energy to the power grid, so that the stability of the power grid is improved.
Drawings
Fig. 1 is a circuit diagram of a switched reluctance motor power converter according to the present invention.
Fig. 2 shows a first main circuit operation.
Fig. 3 shows a second operation of the main circuit.
Fig. 4 shows a first forward operating state of the power supply circuit.
Fig. 5 shows a second forward operating state of the power supply circuit.
Fig. 6 shows a reverse operation state of the power supply circuit.
Fig. 7 shows a second reverse operation state of the power supply circuit.
In fig. 1, 1: a main circuit; 2: a power supply circuit.
Detailed Description
The circuit structure of the switched reluctance motor power converter is shown in fig. 1, the switched reluctance motor is in a three-phase winding and 6/4 pole structure, the three-phase windings are M, N, P respectively, the power converter is composed of a main circuit 1 and a power circuit 2, the main circuit 1 outputs electric energy to a direct current power grid, the output two ends of the power circuit 1 are simultaneously used as the input two ends of the power circuit 2 when working positively, and the output two ends of the power circuit 2 working positively are used as the input two ends of the main circuit 1.
The main circuit 1 is composed of a first switch tube K1, a second switch tube K2, a third switch tube K3, a fourth switch tube K4, a first phase winding M, a second phase winding N, a third phase winding P, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first inductor L1, a second inductor L2 and a third inductor L3, wherein the anode of the first switch tube K1 is connected with the anode of the second switch tube K2 and the anode of the third switch tube K3 and serves as the input positive end of the main circuit 1, the cathode of the first switch tube K1 is connected with one end of the first phase winding M, the cathode of the second switch tube K2 is connected with one end of the second phase winding N, the cathode of the third switch tube K3 is connected with one end of the third phase winding P, the other end of the first phase winding M is connected with the other end of the second phase winding N, the other end of the third phase winding P, the anode of the third phase winding P is connected with the anode of the first diode D1 and the second diode D2, the cathode of the first diode D1 is connected with one end of the first capacitor C1 and one end of the first inductor L1, the cathode of the second diode D2 is connected with the other end of the first inductor L1, the anode of the fourth switch tube K4 and the anode of the fifth diode D5, the cathode of the fifth diode D5 is connected with one end of the second capacitor C2, one end of the third capacitor C3, one end of the second inductor L2 and one end of the third inductor L3, the other end of the second inductor L2 is connected with the anode of the third diode D3, the cathode of the third diode D3 is connected with the other end of the second capacitor C2 and the cathode of the fourth diode D4 and serves as the output positive end of the main circuit 1, the anode of the fourth diode D4 is connected with the other end of the third inductor L3, the other end of the first capacitor C1 is connected with the cathode of the fourth switch tube K4 and the other end of the third capacitor C3 and serves as the output negative end and input negative end of the main circuit 1, the first inductor L1 is magnetically coupled with the second inductor L2 and the third inductor L3.
The power supply circuit 2 is composed of a fifth switch tube K5, a sixth switch tube K6, a seventh switch tube K7, an eighth switch tube K8, a ninth switch tube K9, a sixth diode D6, a seventh diode D7, an eighth diode D8, a ninth diode D9, a tenth diode D10, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a fourth inductor L4, a fifth inductor L5 and a storage battery X, wherein one end of the fourth capacitor C4 is connected with an anode of the eighth switch tube K8 and a cathode of the ninth diode D9 and is used as a positive input end of the power supply circuit 2 to be connected with an output positive end of the main circuit 1, the cathode of the eighth switch tube K8 is connected with an anode of the ninth diode D9, an anode of the sixth switch tube K6, a cathode of the seventh diode D7, one end of the fifth inductor L5, the other end of the fifth inductor L5 is connected with an anode of the seventh switch tube K7, an cathode of the eighth diode D8, and one end of the fifth capacitor C5, the other end of the fifth capacitor C5 is connected with the cathode of the fifth switch tube K5, the anode of the sixth diode D6 and one end of the fourth inductor L4, the anode of the fifth switch tube K5 is connected with the cathode of the sixth diode D6, one end of the sixth capacitor C6, the cathode of the seventh switch tube K7, the anode of the eighth diode D8, the cathode of the ninth switch tube K9 and the anode of the twelfth switch tube D10, and is connected with the input positive terminal of the main circuit 1 as the positive output positive terminal of the power circuit 2, the anode of the ninth switch tube K9 is connected with the cathode of the twelfth switch tube D10 and the positive electrode of the storage battery X, the negative electrode of the storage battery X is connected with the other end of the sixth capacitor C6, the other end of the fourth inductor L4, the cathode of the sixth switch tube K6, the anode of the seventh diode D7 and the other end of the fourth capacitor C4 as the positive input and output negative terminals of the power circuit 2 and is connected with the input positive and output negative terminals of the main circuit 1, the fourth inductor L4 is magnetically coupled with the fifth inductor L5; the positive output terminal of the power circuit 2 in the reverse operation is the positive input terminal in the forward operation, the positive input terminal in the reverse operation is the positive output terminal in the forward operation, the negative output terminal in the reverse operation is the positive input terminal in the forward operation, and all the negative terminals are short-circuited.
All the switching tubes are fully-controlled power electronic switching devices.
In the control method of the switched reluctance motor power converter of the embodiment, when the switched reluctance motor is operated as a motor, for example, when the pumped storage power station main motor as a power grid is connected to pump water to an upstream reservoir as energy consumption equipment at night, or the switched reluctance motor is operated as a generator during the starting period of the switched reluctance motor, the switched reluctance motor operates according to a motor mode, the power supply circuit 2 is operated positively to supply power, and the method also comprises the following steps that when necessary, the ninth switch tube K9 is closed and conducted, and is powered by the storage battery X as a positive output power supply of the power supply circuit 2, the motor operation process of the switched reluctance motor is as follows: according to the basic theory of operation of the switched reluctance motor, the power supply circuit 2 operates in the forward direction to output dc power, when the first phase winding M needs to be put into operation according to the rotor position information, the first switching tube K1 and the fourth switching tube K4 are simultaneously closed and turned on, as shown in fig. 2, the first diode D1, the fourth diode D4 and the fifth diode D5 are turned off, the power supply circuit 2 outputs electric energy forward to supply power to the first phase winding M through the first switching tube K1, the second diode D2 and the fourth switching tube K4, the first capacitor C1 stores energy to the first inductor L1 and charges the second capacitor C2 through the coupling inductor, namely the second inductor L2, when the first phase winding M needs to be operated according to the rotor position information, the fourth switching tube K4 is turned off first, as shown in fig. 3, the second diode D2 and the third diode D3 are turned off, the remaining energy stored in the first phase winding M charges the first capacitor C1, and simultaneously charges the first inductor L1 and the third capacitor C3, and charges the second capacitor C2 through the coupling inductance of the first inductor L1, that is, the third inductor L3, and when the current of the first phase winding M drops to zero, the first switching tube K1 is turned off, and the operation of the first phase winding M is ended; when the second phase winding N needs to be put into operation according to the rotor position information, the second switching tube K2 and the fourth switching tube K4 are simultaneously closed and conducted, the first diode D1, the fourth diode D4 and the fifth diode D5 are cut off, the power supply circuit 2 outputs electric energy in the forward direction to supply power to the second phase winding N through the second switching tube K2, the second diode D2 and the fourth switching tube K4, the first capacitor C1 stores energy to the first inductor L1 and charges the second capacitor C2 through the coupling inductor, namely the second inductor L2, when the second phase winding N needs to be operated according to the rotor position information, the fourth switching tube K4 is firstly cut off, the second diode D2 and the third diode D3 are cut off, the residual energy storage of the second phase winding N charges the first capacitor C1, simultaneously charges the first inductor L1 and the third capacitor C3, and charges the second capacitor C2 through the coupling inductance of the first inductor L1, namely the third inductor L3, when the current of the second phase winding N is reduced to zero, the second switching tube K2 is disconnected, and the second phase winding N is finished; when the third phase winding P needs to be put into operation according to the rotor position information, the third switching tube K3 and the fourth switching tube K4 are simultaneously closed and conducted, the first diode D1, the fourth diode D4 and the fifth diode D5 are cut off, the power supply circuit 2 outputs electric energy positively to supply power to the third phase winding P through the third switching tube K3, the second diode D2 and the fourth switching tube K4, the first capacitor C1 stores energy to be released to the first inductor L1 and charges to the second capacitor C2 through the coupling inductor, namely the second inductor L2, when the third phase winding P needs to be finished according to the rotor position information, the fourth switching tube K4 is firstly opened, the second diode D2 and the third diode D3 are cut off, the residual energy storage of the third phase winding P charges the first capacitor C1, simultaneously charges the first inductor L1 and the third capacitor C3, and charges the second capacitor C2 through the coupling inductance of the first inductor L1, namely the third inductor L3, when the current of the third phase winding P is reduced to zero, the third switching tube K3 is disconnected, and the work of the third phase winding P is ended.
When the switched reluctance motor is operated as a generator, for example, when the main motor of a pumped storage power station connected with a power grid is driven by upstream hydraulic potential energy as power generation equipment in the daytime power grid high load or is used as power generation equipment in the power grid such as a wind driven generator, the power circuit 2 is operated positively to provide exciting power, and the power supply circuit also comprises a ninth switch tube K9 which is closed and conducted by a storage battery X as the forward output exciting power of the power circuit 2 for supplying power when necessary, and the generator of the switched reluctance motor is operated as follows: according to the basic theory of operation of the switched reluctance generator, the power supply circuit 2 is operated in the forward direction to output direct current power for excitation, and when the first phase winding M needs to be put into operation according to the rotor position information, the first switching tube K1 and the fourth switching tube K4 are simultaneously closed and turned on, as shown in fig. 2, the first diode D1, the fourth diode D4 and the fifth diode D5 are turned off, the electric energy output in the forward direction by the power supply circuit 2 is excited and supplied to the first phase winding M through the first switching tube K1, the second diode D2 and the fourth switching tube K4, the excitation phase is entered, the stored energy of the first capacitor C1 is released to the first inductor L1 through the fourth switching tube K4, the second capacitor C2 is charged and output through the coupled inductor, and the fourth switching tube K4 is turned off when the excitation phase is required to be finished according to the rotor position information, the phase of generating the first phase winding M is entered, the second diode D2 and the third diode D3 are turned off under the back voltage, as shown in fig. 3, the first phase winding M, the first inductor L1, and the exciting power supply at the input end are connected in series to charge the third capacitor C3 via the first switching tube K1, the first diode D1, and the fifth diode D5, and output the electric energy, and the voltage at both ends of the third capacitor C3 is used as a part of the generated voltage output by the main circuit 1 and is far higher than the exciting voltage output by the power supply circuit 2 at the input end, thereby achieving the effect of direct high voltage output, in addition, the exciting power supply and the first phase winding M are connected in series to charge the first capacitor C1 via the first switching tube K1 and the first diode D1, the third inductor L3 charges and outputs the second capacitor C2 through the fourth diode D4 in a coupling relation with the first inductor L1, so that the total power generation voltage is further raised, when the first phase winding M is required to be finished according to the rotor position information, the first switching tube K1 is disconnected, and the first phase winding M is finished; when the second phase winding N needs to be put into operation according to the rotor position information, the second switching tube K2 and the fourth switching tube K4 are simultaneously closed and conducted, the first diode D1, the fourth diode D4 and the fifth diode D5 are cut off, the electric energy output by the power circuit 2 in the forward direction is excited and supplied to the second phase winding N through the second switching tube K2, the second diode D2 and the fourth switching tube K4 to enter an excitation stage, at the moment, the energy stored in the first capacitor C1 is released to the first inductor L1 through the fourth switching tube K4, and is charged and output to the second capacitor C2 through the coupling inductor, namely the second inductor L2, when the excitation phase is needed to be ended according to the rotor position information, the fourth switching tube K4 is disconnected, the second phase winding N enters the power generation phase, the second diode D2 and the third diode D3 bear back pressure to cut off, the second phase winding N, the first inductor L1 and the excitation power supply at the input end are connected in series to charge the third capacitor C3 together through the second switching tube K2, the first diode D1 and the fifth diode D5, and simultaneously output electric energy, in addition, the excitation power supply and the second phase winding N are connected in series to charge the first capacitor C1 through the second switching tube K2 and the first diode D1, the third inductor L3 is connected with the first inductor L1 in a coupling relation, charging and outputting the second capacitor C2 through the fourth diode D4, and switching off the second switching tube K2 when the second phase winding N is required to be finished according to the rotor position information, wherein the second phase winding N is finished; when the third phase winding P needs to be put into operation according to the rotor position information, the third switching tube K3 and the fourth switching tube K4 are simultaneously closed and conducted, the first diode D1, the fourth diode D4 and the fifth diode D5 are cut off, the electric energy positively output by the power circuit 2 is excited and supplied to the third phase winding P through the third switching tube K3, the second diode D2 and the fourth switching tube K4 and enters an excitation stage, at the moment, the energy stored in the first capacitor C1 is released to the first inductor L1 through the fourth switching tube K4, and is charged and output to the second capacitor C2 through the coupling inductor, namely the second inductor L2, when the excitation phase is needed to be ended according to the rotor position information, the fourth switching tube K4 is disconnected, the power generation phase of the third phase winding P is entered, at the moment, the second diode D2 and the third diode D3 bear back pressure to cut off, the third phase winding P, the first inductor L1 and the excitation power supply at the input end are connected in series to charge the third capacitor C3 together through the third switching tube K3, the first diode D1 and the fifth diode D5, and simultaneously output electric energy, in addition, the excitation power supply and the third phase winding P are connected in series to charge the first capacitor C1 through the third switching tube K3 and the first diode D1, the third inductor L3 is connected in series to charge the first capacitor C1 through the coupling relation with the first inductor L1, and the fourth diode D4 charges and outputs the second capacitor C2, and when the work of the third phase winding P is required to be finished according to the rotor position information, the third switching tube K3 is turned off, and the work of the third phase winding P is finished.
Because the switch reluctance motor is used as a motor and a generator, the winding electrifying positions are completely different, the proportion of the absorbed and released electric energy is completely different, and according to the basic theory of the switch reluctance motor, when the switch reluctance motor is used as a motor, the electric energy provided by the power supply circuit 2 to the phase winding is mainly converted into mechanical energy to generate power, a small amount of residual magnetic energy charges the first capacitor C1, the second capacitor C2 and the third capacitor C3, and the electric energy is output to a power grid, and the electric energy output by the power supply circuit 2 is far greater than the electric energy output by the main circuit 1; when the generator is operated, in the excitation stage of providing electric energy by the power circuit 2, the phase winding can directly store magnetic energy, and simultaneously can convert mechanical energy generated by negative torque into magnetic energy for storage when the inductance of the phase winding is reduced, and release and output the magnetic energy when the phase winding reaches the power generation stage, wherein the output electric energy is obviously larger than the absorbed excitation electric energy from the power circuit 2.
Whether the switched reluctance motor operates as a generator or a motor, the battery X is automatically charged at the same time through the tenth diode 10 as long as the power supply circuit 2 absorbs the electric power of the power grid to operate in the forward direction.
The power supply circuit 2 absorbs the electric energy output from the direct current power grid or the main circuit 1 as input, and the control process during the forward operation is as follows: the fifth switching tube K5 and the sixth switching tube K6 are not required to be controlled and are always in an open state, the seventh switching tube K7 and the eighth switching tube K8 are synchronously switched according to a PWM mode, the duty ratio is α Z, when the seventh switching tube K7 and the eighth switching tube K8 are closed and turned on, the sixth diode D6, the seventh diode D7, the eighth diode D8 and the ninth diode D9 are turned off, as shown in fig. 4, the electric power from the positive input end of the power supply circuit 2 is charged and output to the fifth inductor L5 and the storage battery X through the seventh switching tube K7 and the eighth switching tube K8, and simultaneously, the fifth capacitor C5 is discharged and is also charged and output to the storage battery X through the fourth inductor L4; when the seventh switching tube K7 and the eighth switching tube K8 are turned off, as shown in fig. 5, the eighth diode D8 and the ninth diode D9 are turned on, the sixth diode D6 and the seventh diode D7 are turned on, the fifth inductor L5 charges the fifth capacitor C5 and simultaneously outputs to the output terminal and charges the battery X, and the fourth inductor L4 coupled with the fifth inductor L5 also outputs to the output terminal and charges the battery X; therefore, no matter what the switching states of the seventh switching tube K7 and the eighth switching tube K8 are, the output end can always output continuous current in work; according to the volt-second balance principle of the fifth inductance L5, it can be deduced that the relation between the output terminal voltage U L and the input terminal voltage U F when the power supply circuit 2 is operated in the forward direction is:
According to the analysis of the working process of the main circuit 1, the voltage of the output end, namely U F, is obviously larger than the voltage of the input end, namely U L, and the formula (1) shows that the alpha Z is always smaller than 1, so that U L<UF is matched with the working of the main circuit; in addition, the U L value can be changed by adjusting alpha Z, when the switch reluctance motor is used as a generator, U L is exciting voltage, variable excitation control can be realized, such as the requirement of tracking control of the maximum power point of assistance in the case of a wind driven switch reluctance generator under the working condition of variable speed wind power, the requirement of control of the maximum power efficiency of assistance, or the improvement of the power efficiency of assistance in the working condition of a pumped storage power station switch reluctance generator, and the like, namely, the output performance of various switch reluctance generator systems can be improved after the exciting voltage is changed; when the switched reluctance motor is used as a motor to run, the U L is the power supply voltage, and the control of the rotating speed and the power of the switched reluctance motor can be realized by changing the U L, which is equivalent to the functions of a converter and a controller of other variable-speed alternating current/direct current motors.
When the power grid load is overlarge or faults cause factors such as voltage dip and the like, and more electric energy is needed to be provided for the power grid, the ninth switch tube K9 is closed and conducted, the power circuit 2 can work reversely except that the storage battery X provides exciting electric energy when the switch reluctance motor is used as a generator, the electric energy feedback of the storage battery X is provided for the power grid, and the control process of the energy feedback work of the power circuit 2 is as follows: the ninth switching tube K9 is always in a closed and conductive state, the seventh switching tube K7 and the eighth switching tube K8 are not required to be controlled, and are always in an open state, the fifth switching tube K5 and the sixth switching tube K6 synchronously switch according to the PWM mode, the duty ratio is α F, when the fifth switching tube K5 and the sixth switching tube K6 are closed and conductive, as shown in fig. 6, the sixth diode D6, the seventh diode D7, the eighth diode D8, the ninth diode D9 and the twelfth diode D10 are turned off, and the battery X and the fifth capacitor C5 are serially connected together to charge the fifth inductor L5; when the fifth switching tube K5 and the sixth switching tube K6 are turned off, as shown in fig. 7, the sixth diode D6, the seventh diode D7, and the tenth diode D10 are still turned off, the eighth diode D8 and the ninth diode D9 are turned on, the battery X and the fifth inductor L5 are connected in series together to charge the fourth capacitor C4, and simultaneously supply power to the grid output, and the battery X also charges the fifth capacitor C5; according to the volt-second balance principle of the fifth inductor L5 and the charge-discharge balance relation of the fifth capacitor C5, the relation between the output terminal voltage U F and the input terminal voltage U L when the power supply circuit 2 works in the reverse direction can be deduced as follows:
The duty ratio α F <1, as can be seen from equation (2), the grid terminal voltage U F is significantly larger than the input voltage U L when the power supply circuit 2 is operating in reverse, matching the foregoing relationship, when a fault such as wind driven generator operation, grid voltage dip, etc., the boost power can be applied to the low voltage ride through, or the grid load is too large, the battery X helps to increase the power supply, etc., and the duty ratio α F can be flexibly adjusted to adapt to the best demands.
Although the power supply circuit 2 has four switching tubes, only two switching tubes are switched when the power supply circuit works in any direction, and the power supply circuit is synchronously switched, so that the power supply circuit has a certain significance in reducing switching loss and control complexity.

Claims (8)

1. The power converter of the switch reluctance motor consists of a main circuit and a power circuit, and is technically characterized in that the main circuit outputs electric energy to a direct current power grid, the output two ends of the main circuit are simultaneously used as the input two ends of the power circuit when working positively, and the output two ends of the power circuit working positively are used as the input two ends of the main circuit.
2. A switched reluctance motor power converter according to claim 1, characterized in that the main circuit consists of a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a first phase winding, a second phase winding, a third phase winding, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a first capacitor, a second capacitor, a third capacitor, a first inductance, a second inductance, and a third inductance, wherein the first switch tube anode is connected to the second switch tube anode and the third switch tube anode as the main circuit input positive terminal, the first switch tube cathode is connected to one end of the first phase winding, the second switch tube cathode is connected to one end of the second phase winding, the third switch tube cathode is connected to one end of the third phase winding, the other end of the first phase winding is connected to the other end of the second phase winding, the other end of the third phase winding, the first diode anode, and the second diode anode, the first diode cathode is connected to one end of the first inductance and the third inductance, the second diode anode is connected to the other end of the second inductance, the third diode anode is connected to the other end of the third diode anode, the third diode cathode is connected to the other end of the third inductance, the fourth diode cathode is connected to the other end of the third diode anode, the third diode anode is connected to the other end of the third inductance, the third diode anode is connected to the other end of the third diode anode, the third diode cathode is connected to the third end of the third inductance, the third diode anode is connected to the third end of the third diode and the third diode anode, and acts as an output negative terminal and an input negative terminal of the main circuit, and the first inductor is magnetically coupled with the second inductor and the third inductor.
3. The switched reluctance motor power converter according to claim 1, wherein the power supply circuit is composed of a fifth switching tube, a sixth switching tube, a seventh switching tube, an eighth switching tube, a ninth switching tube, a sixth diode, a seventh diode, an eighth diode, a ninth diode, a tenth diode, a fourth capacitor, a fifth capacitor, a sixth capacitor, a fourth inductor, a fifth inductor, and a battery, wherein one end of the fourth capacitor is connected to the eighth switching tube anode and the ninth diode cathode, and is connected as a positive input end of the power supply circuit to an output positive end of the main circuit, the eighth switching tube cathode is connected to the ninth diode anode, the sixth switching tube anode, the seventh diode cathode, and one end of the fifth inductor, the other end of the fifth inductor is connected to the seventh switching tube anode, the eighth diode cathode, and one end of the fifth capacitor, the other end of the fifth capacitor is connected with the cathode of the fifth switch tube, the anode of the sixth diode and one end of the fourth inductor, the anode of the fifth switch tube is connected with the cathode of the sixth diode, one end of the sixth capacitor, the cathode of the seventh switch tube, the anode of the eighth diode, the cathode of the ninth switch tube and the anode of the tenth diode, and is used as the positive output positive end of the power circuit to be connected with the input positive end of the main circuit, the anode of the ninth switch tube is connected with the cathode of the tenth diode and the positive electrode of the storage battery, the cathode of the storage battery is connected with the other end of the sixth capacitor, the other end of the fourth inductor, the cathode of the sixth switch tube, the anode of the seventh diode and the other end of the fourth capacitor, and is used as the positive input negative end and the output negative end of the power circuit to be connected with the input negative end and the output negative end of the main circuit, the fourth inductor is magnetically coupled with the fifth inductor; the positive output end of the power circuit in the reverse operation is the positive input end in the positive operation, the positive input end in the reverse operation is the positive output end in the positive operation, the negative output end in the reverse operation is the positive input end in the positive operation, and all the negative terminals are short-circuited.
4. A control method of a power converter of a switched reluctance motor according to claim 1 or 2, wherein the power supply circuit is operative to supply power to the motor when the switched reluctance motor is operated as a motor, and the motor of the switched reluctance motor is operative to: according to the basic theory of a switched reluctance motor, when a first phase winding needs to be put into operation according to rotor position information, a first switching tube and a fourth switching tube are simultaneously closed and conducted, a first diode, a fourth diode and a fifth diode are cut off, a power supply circuit outputs electric energy positively to supply power to the first phase winding through the first switching tube, the second diode and the fourth switching tube, energy stored by a first capacitor is released to a first inductor and is charged to a second capacitor through a second inductor, when the operation of the first phase winding needs to be finished according to rotor position information, the fourth switching tube is firstly disconnected, the second diode and a third diode are cut off, residual energy stored by the first phase winding is charged to the first capacitor, the first inductor and the third capacitor are charged simultaneously, the second capacitor is charged through the third inductor, and when the current of the first phase winding is reduced to zero, the first switching tube is disconnected, and the operation of the first phase winding is finished; when the second phase winding needs to be put into operation according to rotor position information, the second switching tube and the fourth switching tube are simultaneously closed and conducted, the first diode, the fourth diode and the fifth diode are cut off, the power supply circuit outputs electric energy positively to supply power to the second phase winding through the second switching tube, the second diode and the fourth switching tube, the first capacitor stores energy to be released to the first inductor and charges the second capacitor through the second inductor, when the second phase winding needs to be finished according to rotor position information, the fourth switching tube is firstly disconnected, the second diode and the third diode are cut off, the residual energy of the second phase winding charges the first capacitor and charges the first inductor and the third capacitor simultaneously, and charges the second capacitor through the third inductor, and when the second phase winding current is reduced to zero, the second switching tube is disconnected, and the second phase winding is finished; when the third phase winding needs to be put into operation according to the rotor position information, the third switching tube and the fourth switching tube are simultaneously closed and conducted, the first diode, the fourth diode and the fifth diode are cut off, the power supply circuit outputs electric energy positively to supply power to the third phase winding through the third switching tube, the second diode and the fourth switching tube, the first capacitor stores energy to be released to the first inductor and charges to the second capacitor through the second inductor, when the third phase winding needs to be operated according to the rotor position information, the fourth switching tube is firstly disconnected, the second diode and the third diode are cut off, the residual energy of the third phase winding charges to the first capacitor and charges to the first inductor and the third capacitor simultaneously, and charges to the second capacitor through the third inductor, and when the current of the third phase winding is reduced to zero, the third switching tube is disconnected, and the third phase winding is operated.
5. The control method of a power converter of a switched reluctance motor according to claim 1 or 2, wherein when the switched reluctance motor operates as a generator, the power supply circuit is operated in a forward direction to supply exciting power, and the generator of the switched reluctance motor is operated in a process of: according to the basic theory of the switched reluctance generator, when the first phase winding needs to be put into operation according to the rotor position information, the first switching tube and the fourth switching tube are simultaneously closed and conducted, the first diode, the fourth diode and the fifth diode are cut off, the electric energy positively output by the power supply circuit is used for supplying power to the first phase winding through the first switching tube, the second diode and the fourth switching tube, the excitation stage is entered, the energy stored in the first capacitor is released to the first inductor through the fourth switch tube, and the second capacitor is charged and output through the second inductor, when the excitation stage is needed to be finished according to the rotor position information, the fourth switch tube is disconnected, the first phase winding power generation stage is entered, the second diode and the third diode bear back pressure to cut off, the first phase winding, the first inductor and the exciting power supply at the input end are connected in series to charge the third capacitor together through the first switch tube, the first diode and the fifth diode, and simultaneously output electric energy, in addition, the exciting power supply and the first phase winding are connected in series to charge the first capacitor through the first switch tube and the first diode, the third inductor charges and outputs the second capacitor through the fourth diode, and when the work of the first phase winding is required to be finished according to the rotor position information, the first switching tube is disconnected, and the work of the first phase winding is finished; when the second phase winding needs to be put into operation according to the rotor position information, the second switching tube and the fourth switching tube are simultaneously closed and conducted, the first diode, the fourth diode and the fifth diode are cut off, electric energy positively output by the power supply circuit is excited and supplied to the second phase winding through the second switching tube, the second diode and the fourth switching tube and enters an excitation stage, at the moment, energy stored in the first capacitor is released to the first inductor through the fourth switching tube, and is charged and output to the second capacitor through the second inductor, when the excitation stage needs to be finished according to the rotor position information, the fourth switching tube is opened, the power generation stage of the second phase winding is started, at the moment, the second diode and the third diode bear back pressure and are cut off, the second phase winding, the first inductor and the exciting power supply at the input end are connected in series to charge the third capacitor through the second switching tube, the first diode and the fifth diode together, and simultaneously output electric energy; when the third phase winding needs to be put into operation according to the rotor position information, the third switching tube and the fourth switching tube are simultaneously closed and conducted, the first diode, the fourth diode and the fifth diode are cut off, electric energy positively output by the power supply circuit is excited and supplied to the third phase winding through the third switching tube, the second diode and the fourth switching tube and enters an excitation stage, at the moment, energy stored in the first capacitor is released to the first inductor through the fourth switching tube, and is charged and output to the second capacitor through the second inductor, when the excitation stage needs to be finished according to the rotor position information, the fourth switching tube is opened, the power generation stage of the third phase winding is entered, at the moment, the second diode and the third diode bear back pressure and are cut off, the third phase winding, the first inductor and the exciting power supply at the input end are connected in series to charge the third capacitor through the third switching tube, the first diode and the fifth diode together, and simultaneously output electric energy.
6. The control method of a switched reluctance motor power converter according to claim 4 and 5, wherein the power supply circuit is capable of simultaneously and automatically charging the storage battery through the tenth diode whenever the power supply circuit absorbs the power of the power grid to operate in the forward direction, regardless of whether the switched reluctance motor operates as a generator or a motor.
7. A control method of a switched reluctance motor power converter according to claims 1 and 3, characterized in that the power supply circuit absorbs the power of the main circuit output, i.e. the dc network, as input during the control process in forward operation: the fifth switching tube and the sixth switching tube are always in an off state, the seventh switching tube and the eighth switching tube synchronously switch according to a PWM mode, the duty ratio is alpha Z, when the seventh switching tube and the eighth switching tube are closed and conducted, the sixth diode, the seventh diode, the eighth diode and the ninth diode are cut off, the electric energy of the power grid charges and outputs the fifth inductor and the storage battery through the seventh switching tube and the eighth switching tube, and meanwhile, the fifth capacitor discharges and charges and outputs the storage battery through the fourth inductor; when the seventh switching tube and the eighth switching tube are disconnected, the eighth diode and the ninth diode are continuously turned off, the sixth diode and the seventh diode are turned on, the fifth inductor charges the fifth capacitor and simultaneously outputs the output end and charges the storage battery, and the fourth inductor also outputs the output end and charges the storage battery; according to the principle of volt-second balance of inductance, the relation between the output end voltage U L and the input end voltage U F when the power supply circuit works in the forward direction can be deduced as follows:
By adjusting alpha Z, the U L value can be changed, and when the switch reluctance motor is used as a generator, U L is exciting voltage, so that variable excitation control can be realized; when the switched reluctance motor operates as a motor, U L is the power supply voltage, and the control of the rotating speed and the power of the switched reluctance motor can be realized by changing U L.
8. A control method of a switched reluctance motor power converter according to claims 1 and 3, characterized in that the power supply circuit is operable in reverse, the power feedback of the battery is provided to the power grid, and the power supply circuit is operable in reverse-fed control: the ninth switching tube is always in a closed and conducting state, the seventh switching tube and the eighth switching tube are always in an open state, the fifth switching tube and the sixth switching tube synchronously switch according to a PWM mode, the duty ratio is alpha F, when the fifth switching tube and the sixth switching tube are closed and conducted, the sixth diode, the seventh diode, the eighth diode, the ninth diode and the twelfth diode are cut off, and the storage battery and the fifth capacitor are connected in series to charge the fifth inductor; when the fifth switching tube and the sixth switching tube are turned off, the sixth diode, the seventh diode and the twelfth diode are still turned off, the eighth diode and the ninth diode are turned on, the storage battery and the fifth inductor are connected in series to charge the fourth capacitor and output the fourth capacitor to the power grid, and the storage battery also charges the fifth capacitor; according to the volt-second balance principle of the fifth inductor and the charge-discharge balance relation of the fifth capacitor, the relation between the output terminal voltage U F and the input terminal voltage U L when the power circuit works reversely can be deduced as follows:
the magnitude of the duty cycle alpha F can be adjusted to suit the system requirements.
CN202410244774.2A 2024-03-05 2024-03-05 Switch reluctance motor power converter and control method thereof Pending CN118174562A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202410244774.2A CN118174562A (en) 2024-03-05 2024-03-05 Switch reluctance motor power converter and control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202410244774.2A CN118174562A (en) 2024-03-05 2024-03-05 Switch reluctance motor power converter and control method thereof

Publications (1)

Publication Number Publication Date
CN118174562A true CN118174562A (en) 2024-06-11

Family

ID=91346519

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202410244774.2A Pending CN118174562A (en) 2024-03-05 2024-03-05 Switch reluctance motor power converter and control method thereof

Country Status (1)

Country Link
CN (1) CN118174562A (en)

Similar Documents

Publication Publication Date Title
CN110061678B (en) Electro-magnetic doubly salient motor driving and charging integrated system
CN109921704B (en) Switch reluctance generator converter and control method thereof
CN110011580B (en) Switched reluctance generator current transformation system
CN109995284B (en) Self-charging switched reluctance generator current transformation system
CN107046385A (en) From reinforcing self-charging separate excitation switch reluctance generator current transformer and its control method
CN118174562A (en) Switch reluctance motor power converter and control method thereof
CN110829916B (en) Direct-boosting continuous-power-generation double-fed switched reluctance generator current conversion system
CN110729932B (en) Multi-mode voltage transformation switched reluctance generator current transformation system and regulation and control method thereof
CN110677083B (en) Direct-boost excitation switched reluctance generator current conversion system
CN110212824A (en) A kind of direct high voltage output double-fed switch reluctance generator converter system
CN110677085B (en) Variable excitation doubly-fed switched reluctance generator current transformation system
CN110212826B (en) Converter system of direct-boost double-fed switched reluctance generator
CN100355194C (en) Topological structure of switch power supply changer
CN110460275B (en) Converter system of direct-boost double-fed switched reluctance generator
CN110829915B (en) Variable excitation direct-boost switch reluctance generator current conversion system
CN113890435B (en) Four-phase switch reluctance generator converter and control method thereof
CN110429880B (en) Double-excitation double-fed mutual charging high-speed switch reluctance generator current conversion system
CN118199449A (en) Direct-boosting doubly-fed switched reluctance motor power converter and control method thereof
CN110474582B (en) Reverse polarity direct voltage-boosting self-excitation switched reluctance generator current conversion system
CN110535383B (en) Switched reluctance generator current conversion system with capacitor direct-voltage boosting self-charging excitation and control method thereof
CN110535384B (en) Converter system of direct-boost double-fed switched reluctance generator
CN116015127A (en) High-speed switch reluctance motor power converter and regulation and control method
CN110784137B (en) Boost double-fed switch reluctance generator current transformation system
CN118100125A (en) Switch reluctance wind driven generator power converter and control method thereof
CN118449404A (en) Variable excitation continuous switch reluctance generator power converter and control method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination