CN114825406A - Grid-connected and off-grid type high-power bidirectional converter device - Google Patents
Grid-connected and off-grid type high-power bidirectional converter device Download PDFInfo
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- CN114825406A CN114825406A CN202210530193.6A CN202210530193A CN114825406A CN 114825406 A CN114825406 A CN 114825406A CN 202210530193 A CN202210530193 A CN 202210530193A CN 114825406 A CN114825406 A CN 114825406A
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- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a grid-connected and off-grid type high-power bidirectional converter device which comprises a direct-current side trimming filter circuit, a bidirectional converter circuit, an alternating-current side filter circuit and a signal acquisition and control circuit, wherein the bidirectional converter circuit is used for inverting/rectifying mutual conversion and switching the discharging/charging state of an energy storage battery pack; the signal acquisition and control circuit is used for transmitting the acquired direct-current side electric acquisition signals, the acquired alternating-current side electric acquisition signals and the conversion circuit control communication signals to corresponding interfaces of the central acquisition control unit to form a closed-loop control circuit, so that the energy storage battery pack is charged or is subjected to discharge maintenance, and the discharged electric energy is fed back to the power grid. The invention integrates the functions of DC-DC charging and discharging management, DC-AC inversion, AC-DC bidirectional interconversion and conversion, power quality control monitoring and charging and discharging management of the energy storage battery.
Description
Technical Field
The invention belongs to the technical field of new energy electric power, and relates to a grid-connected off-grid type high-power bidirectional converter device which is suitable for application occasions such as an energy storage system, a storage battery remote maintenance system, a storage battery remote charging and discharging management system, an energy storage grid-connected type micro-grid system and the like.
Background
The power system consists of six parts of development, power generation, transmission, power distribution, consumption, storage and the like. In recent decades, with the continuous advancement of electric energy transformation, the main energy storage technology has received high attention from the industry as a key node for driving renewable energy from replacing traditional energy to new energy. The energy storage system has important significance in realizing functions of personalized electricity demand side energy management of a terminal user, power transmission and transformation support of a power grid of a transformer substation, load balance, renewable energy application and the like. Although the traditional energy storage management system combining split type equipment such as a rectifier, an inverter, an energy storage converter and the like solves the problem of power limitation of new energy, can stabilize power fluctuation, reduce impact on a power grid and the like, the traditional energy storage management system has the defects of multiple equipment types, large volume, heaviness, low integration intelligent degree and difficulty in effectively providing intelligent services such as power peak regulation, frequency modulation, peak clipping and valley filling, electric energy quality control and the like on technical performance.
From the perspective of power supply and distribution application of a user terminal, in order to provide an advanced and complete solution for an energy storage and micro-grid system and meet requirements of different types of application scenes, a grid-connected and off-grid bidirectional converter device which is high in integration, strong in intellectualization and miniaturized is urgently required to be designed and developed.
Disclosure of Invention
In order to solve the problems, the invention provides a grid-connected and off-grid type high-power bidirectional converter device which integrates the functions of DC-DC charging and discharging management, DC-AC inversion, AC-DC bidirectional interconversion and conversion, power quality control monitoring and charging and discharging management of an energy storage battery, and solves the problems in the prior art.
The invention adopts the technical scheme that a grid-connected off-grid high-power bidirectional converter device comprises
The direct-current side trimming filter circuit is connected between the direct-current power supply and the bidirectional converter circuit;
the bidirectional converter circuit is used for inverting/rectifying mutual conversion and switching the discharging/charging state of the energy storage battery pack;
an AC side filter circuit connected between the bidirectional converter circuit and an AC power supply;
and the signal acquisition and control circuit is used for transmitting the acquired direct-current side electric acquisition signals, the acquired alternating-current side electric acquisition signals and the conversion circuit control communication signals to a corresponding interface of the central acquisition control unit to form a closed-loop control circuit, charging the energy storage battery pack, or discharging and maintaining the energy storage battery pack, and feeding back the discharged electric energy to the power grid.
Further, the bidirectional converter circuit comprises a V2 end and a V1 end, a capacitor C1 is connected in parallel between the positive electrode and the negative electrode of V1, a capacitor C2 is connected in parallel between the positive electrode and the negative electrode of V2, a diode D1 and a diode D2 are connected in series, a capacitor Cr1 is connected in parallel between the two ends of diode D1, a capacitor Cr2 is connected in parallel between the two ends of diode D2, the positive electrode of diode D2 is grounded, and the negative electrode of diode D1 is connected with the positive electrode of the V2 end and the capacitor C2; a series node of the diode D1 and the diode D2 is connected with a series node of the inductor Lr1 and the inductor Lr2, the inductor Lr1 is connected with the S pole of the switching tube S1, the D pole of the switching tube S1 is connected with the negative pole of the diode D1, the inductor Lr2 is connected with the D pole of the switching tube S2, and the S pole of the switching tube S2 is grounded; the series node of the inductor Lr1 and the inductor Lr2 is connected with one end of the inductor L, and the other end of the inductor L is connected with the anodes of the capacitors C1 and V1.
Furthermore, the switch tube S2 is controlled to be always kept in an off state, the converter is operated by controlling the on-off of the switch tube S1, the inductor L, the inductor Lr2, the switch tube S2, the diode D1 and the capacitor Cr1 form a boost type complex resonant converter, the whole system energy is transmitted from the V1 end to the V2 end, and at this time, the battery pack connected to the V1 end is in a discharge maintenance state.
Furthermore, the switching tube S2 is controlled to be always kept in an off state, the converter is operated by controlling the on-off of the switching tube S1, the switching tube S1, the inductor Lr1, the inductor L, the diode D2 and the capacitor Cr2 form a buck-type complex resonant converter, the energy of the whole system is transmitted from the V2 end to the V1 end, and at this time, the battery pack connected to the V1 end is in a charging state.
Furthermore, the direct current side trimming filter circuit comprises a direct current voltage transient suppressor, a direct current side switch, a direct current side electromagnetic interference filter and a direct current bus; the direct current power supply is connected with the direct current side switch through the direct current voltage transient suppressor, and forms a direct current bus after being filtered by the direct current side electromagnetic interference filter, and the direct current bus is connected with the V1 end of the bidirectional converter circuit.
Furthermore, the alternating current side filter circuit comprises an isolation transformer, an alternating current side filter, an alternating current side electromagnetic interference filter, an alternating current side switch and an alternating current voltage transient suppressor, wherein the V2 end of the bidirectional converter circuit is connected with the alternating current side filter through the isolation transformer, and is connected with an alternating current power supply end after sequentially passing through the alternating current side switch and the alternating current voltage transient suppressor after being filtered by the alternating current side electromagnetic interference filter.
Further, the bidirectional converter device provides four system operation modes: the system comprises a single machine off-grid operation mode, a single machine grid-connected operation mode, a parallel machine off-grid operation mode and a parallel machine grid-connected operation mode.
Further, the switching tube S1 and the switching tube S2 are N-channel field effect transistors.
Furthermore, a direct current interface, a communication interface, an alternating current interface and heat dissipation holes are arranged on the case; the direct current interface is connected with the direct current power supply end, the communication interface is connected with the communication interface of the central acquisition control unit, and the alternating current interface is connected with the alternating current power supply end.
The invention has the beneficial effects that:
1. the device disclosed by the invention adopts a high-frequency isolation technology, and the independent load capacity and safety of the storage battery pack and the two sides of the power grid are effectively guaranteed.
2. The device has the advantages of single machine conversion power of 6KW, energy conservation, environmental protection, high conversion efficiency and easy parallel machine current sharing expansion. The invention can quickly and conveniently build a new energy storage system, reduce the number of equipment, can replace charging equipment and inverter equipment in the energy storage system based on the equipment, and has convenient wiring, high safety and lower engineering cost.
3. The device is a control core of the whole power grid system, performs data acquisition and control scheduling on other equipment (mainly comprising an inverter, an energy storage converter, an environment detector, an electric energy meter and the like) in the system, coordinates the system to realize the functions of power fluctuation suppression, peak clipping and valley filling, countercurrent prevention, battery management and maintenance and the like according to a prefabricated energy scheduling management algorithm, ensures the stable operation of the system in the whole life cycle, can realize the unattended requirement of a power station, and more effectively saves the manual operation and maintenance cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a diagram of a minimum grid system to which the apparatus of the present invention is applied.
Fig. 2 is an electrical schematic block diagram of an embodiment of the invention.
Fig. 3 is a schematic structural diagram of a chassis according to an embodiment of the present invention.
Fig. 4 is a rear view of fig. 3.
Fig. 5 is a circuit diagram of a bidirectional converter circuit.
FIG. 6 is an equivalent circuit diagram of a V1-V2 boost type complex resonant converter.
FIG. 7 is an equivalent circuit diagram of a voltage-reducing type complex resonant converter from V1 to V2.
In the figure, 1, an energy storage battery pack, 2, a bidirectional converter device, 3, a public power grid, 4, a user load, 5, a direct current side switch, 6, a direct current side electromagnetic interference filter, 7, a direct current bus, 8, a bidirectional converter circuit, 9, an isolation transformer, 10, an alternating current side filter, 11, an alternating current side electromagnetic interference filter, 12, an alternating current side switch, 13, a direct current voltage transient suppressor, 14, an alternating current voltage transient suppressor, 15, a central acquisition control unit, 16, a case, 17, a direct current interface, 18, a communication interface, 19, an alternating current interface and 20 heat dissipation holes are arranged.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the case of the example 1, the following examples are given,
a grid-connected and grid-disconnected high-power bidirectional converter device is shown in figure 1, is applied to a minimum power grid system of the device, is used as an important device in an energy storage system, receives an instruction of an energy management system, and achieves main functions of the system, including power quality monitoring, charging and discharging management of an energy storage battery and the like.
The device can provide two circuit working modes: the power grid can charge the energy storage battery pack 1 through the bidirectional converter device 2; the energy storage battery pack 1 realizes intelligent checking and discharging maintenance through the bidirectional converter device 2, and feeds the discharged electric energy back to a power grid.
The bidirectional converter device 2 can provide four system operation modes: the system comprises a single machine off-grid operation mode, a single machine grid-connected operation mode, a parallel machine off-grid operation mode and a parallel machine grid-connected operation mode. Single off-grid operation mode: the single bidirectional converter device 2 operates independently without being connected to a power grid, and has strong practicability for areas without power grids or areas with frequent power failure. Single machine grid-connected operation mode: the single bidirectional converter device 2 is connected to a power grid and depends on the existing power grid operation mode. And (3) a parallel operation off-grid operation mode: and the plurality of bidirectional converter devices 2 are connected in parallel for capacity expansion, are not connected with a power grid and operate independently. Parallel operation and grid-connected operation mode: and the plurality of bidirectional converter devices 2 are connected in parallel for capacity expansion, then are connected into the existing public power grid, and then are connected into the power grid, and operate depending on the public power grid.
An electrical schematic block diagram of the grid-connected and off-grid type high-power bidirectional converter device 2 in the embodiment of the invention is shown in fig. 2 and comprises a direct-current side trimming filter circuit, a bidirectional converter circuit 8, an alternating-current side filter circuit, a signal acquisition and control circuit and the like.
The direct current power supply is connected with the direct current side switch 5 through the direct current voltage transient suppressor 13, forms a direct current bus 7 after being filtered by the direct current side electromagnetic interference filter 6, the direct current bus 7 is connected with the bidirectional converter circuit 8 for conversion, is isolated by the isolation transformer 9 and then is connected with the alternating current side filter 10, then is connected with the alternating current side electromagnetic interference filter 11, and is connected with the alternating current power supply end after passing through the alternating current side switch 12 and the alternating current voltage transient suppressor 14. The direct current side electrical acquisition signal, the alternating current side electrical acquisition signal and the conversion circuit control communication signal are respectively connected with the corresponding onboard communication interface 18 of the central acquisition control unit 15 to form a closed-loop control circuit, so that effective real-time power quality control and monitoring are realized. The direct current side electric acquisition signal comprises direct current side voltage and current, and is output through a direct current voltage transmitter and a current transmitter; the alternating current side electric acquisition signal comprises alternating current side voltage and current, and is output through an alternating current voltage transformer, a current transformer and a signal acquisition amplifying circuit.
In fig. 2, the dc voltage transient suppressor 13, the dc side switch 5, the dc side electromagnetic interference filter 6, the dc bus 7, the bidirectional converter circuit 8, the isolation transformer 9, the ac side filter 10, the ac side electromagnetic interference filter 11, the ac side switch 12, and the ac voltage transient suppressor 14 have structures known in the art.
As shown in fig. 3, the chassis 16 is a 5U chassis, and the chassis 16 is provided with a dc interface 17, a communication interface 18, an ac interface 19, and heat dissipation holes 20; the direct current interface 17 is connected with the DC terminal, the communication interface 18 is connected with the communication interface of the central acquisition control unit 15, and the alternating current interface 19 is connected with the AC terminal.
The bidirectional converter circuit 8 functions in the present invention to convert AC-DC (i.e., alternating current to direct current) and DC-AC (i.e., direct current to alternating current) electrical energy.
As shown in fig. 5, the bidirectional converter circuit 8 includes a V2 terminal, a V1 terminal, a capacitor C1 connected in parallel between the positive and negative electrodes of V1, a capacitor C2 connected in parallel between the positive and negative electrodes of V2, a diode D1 and a diode D2 connected in series, a capacitor Cr1 connected in parallel between the two ends of diode D1, a capacitor Cr2 connected in parallel between the two ends of diode D2, the positive electrode of diode D2 connected to ground, and the negative electrode of diode D1 connected to the positive electrode of V2 terminal and the capacitor C2; a series node of the diode D1 and the diode D2 is connected with a series node of the inductor Lr1 and the inductor Lr2, the inductor Lr1 is connected with the S pole of the switching tube S1, the D pole of the switching tube S1 is connected with the negative pole of the diode D1, the inductor Lr2 is connected with the D pole of the switching tube S2, and the S pole of the switching tube S2 is grounded; the series node of the inductor Lr1 and the inductor Lr2 is connected with one end of the inductor L, and the other end of the inductor L is connected with the anodes of the capacitors C1 and V1. The G poles of the switch tube S1 and the switch tube S2 are connected with the central acquisition control unit 15, the central acquisition control unit 15 carries out coordination control, and the central acquisition control unit 15 comprises a signal acquisition circuit, an information processing circuit, a control output circuit, a central processing unit, a keyboard liquid crystal display circuit and the like. In the embodiment, the switch tube S1 and the switch tube S2 adopt an IXYS N-channel field effect tube IXFK26N 120P. The switching circuit converter uses electronic switching devices such as transistors, field effect transistors and the like, and makes the electronic switching devices continuously turn on and off through a control circuit, so that the electronic switching devices perform pulse modulation on input voltage, thereby realizing DC/AC and DC/DC voltage conversion, and adjustable and automatic voltage stabilization of output voltage.
The core of the bidirectional converter circuit 8 is a bidirectional DC-DC complex resonance converter based on Boost-Buck, the complex resonance converter is formed by adding a resonance capacitor and a rectifier diode in parallel on the basis of a voltage resonance switch circuit, the parasitic capacitor of a switch, the parasitic capacitor of the diode and the parasitic inductor in the circuit are all used as a part of elements in the resonance circuit, the current passing through the switch and the waveform of the voltage applied to two ends of the switch are all part of a sine wave, the switching loss and the switching surge are small, and the bidirectional DC-DC complex resonance converter can work at high frequency.
As shown in fig. 6, when the converter is in a Boost (Boost) mode, the switching tube S1 is controlled to be always kept in an off state, the converter is operated by controlling the on/off of the switching tube S2, the inductor L, the inductor Lr2, the switching tube S2, the diode D1 and the capacitor Cr1 form a Boost type complex resonant converter, the whole system energy is transferred from left to right (from the V1 end to the V2 end), and at this time, the battery pack connected to the V1 end is in a discharge maintenance state.
As shown in fig. 7, when the converter is in a Buck (Buck) mode, the switching tube S2 is controlled to be always kept in an off state, the converter is operated by controlling the on/off of the switching tube S1, the switching tube S1, the inductor Lr1, the inductor L, the diode D2 and the capacitor Cr2 form a Buck-type complex resonant converter, the whole system energy is transferred from right to left (from the V2 end to the V1 end), and at this time, the battery pack connected to the V1 end is in a charging state.
The bidirectional converter circuit 8 of the embodiment of the invention is additionally provided with the dc-dc complex resonance converting circuit, and when a storage battery pack is charged, the dc-dc converting circuit can be controlled to refine the charging voltage; when discharging and inverting, the dc-dc change circuit is adjusted to enable the direct current voltage to meet the national grid or commercial power voltage standard after inverting so as to be convenient for grid connection. The resonant converter can be switched on and off at zero current or zero voltage, has lower switching loss and switching surge than a PWM converter, and has the advantages of saving energy, reducing consumption and improving power density of a power module.
The working principle of the device of the invention is as follows:
when the grid-connected off-grid type high-power bidirectional converter device 2 needs to work in an inversion mode of direct current to alternating current in an energy storage system, the voltage of an energy storage battery pack 1 is connected with a direct current interface 17 of the bidirectional converter device 2, an alternating current side power grid (namely a public power grid 3) or a user load 4 is connected with an alternating current interface 19 of the bidirectional converter 2, after a direct current side switch 5 and an alternating current side switch 12 are turned on, direct current voltage enters a bidirectional converter circuit 8 after being filtered by a direct current side electromagnetic interference filter 6 and a bus capacitor, and at the moment, the bidirectional converter circuit 8 works in a direct current to alternating current inversion state after being intelligently adjusted by a central acquisition control unit 15 according to the working mode. That is, the central acquisition control unit 15 controls the switching tube S1 in the bidirectional converter circuit 8 to be always kept in an open state, and controls the opening and closing of the switching tube S2 to operate the converter in the energy transfer direction indicated by the arrow, thereby boosting the voltage. The required alternating current is formed after inversion and filtering and is merged into a public power grid 3 for use (namely, a single-machine grid-connected operation mode) or is directly supplied to a user load 4 for use (namely, a single-machine off-grid operation mode); in the process, the central acquisition control unit 15 monitors the battery parameters such as the voltage, the current, the battery temperature, the internal resistance and the like of the energy storage battery pack 1 in real time, knows the state of the energy storage battery pack 1, performs power supply endurance analysis, gives a normal or early warning signal, and intelligently controls and controls the load.
When the bidirectional converter device 2 needs to work in an AC-to-DC rectification mode in an energy storage system, the voltage of an energy storage battery pack 1 is connected with a DC interface 17 of the bidirectional converter device 2, an AC side power grid is connected with an AC interface 19, after a DC side switch 5 and an AC side switch 12 are turned on, an AC power supply is filtered by a filter capacitor of an AC side electromagnetic interference filter 11 and an AC side filter 10, and is connected with a bidirectional conversion circuit 8 after passing through an isolation transformer 9, and at the moment, the bidirectional converter circuit 8 works in an AC-to-DC rectification state after being intelligently adjusted by a central acquisition control unit 15 according to the working mode. That is, the central acquisition control unit 15 controls the switching tube S2 in the bidirectional converter circuit 8 to be always kept in an open state, and controls the opening and closing of the switching tube S1 to operate the converter in the energy transfer direction indicated by the arrow, so as to perform voltage reduction. After the direct current side filtering, stable direct current voltage is formed to be used for charging the energy storage battery pack 1 or other direct current loads; in the process, the central acquisition control unit 15 monitors the battery parameters such as the voltage, the current, the battery temperature, the internal resistance and the like of the energy storage battery pack 1 in real time, knows the state of the energy storage battery pack 1, analyzes the charging state and gives a normal or early warning signal.
The invention integrates the functions of DC-DC charging and discharging management, DC-AC inversion, AC-DC bidirectional interconversion and current transformation, monitoring control and the like; the grid-connected and off-grid bidirectional electric energy conversion device supporting single-phase/three-phase AC-DC can provide two circuit working modes: the power grid can charge the storage battery pack through the device; the storage battery pack realizes intelligent discharge checking maintenance through the device and feeds the discharged electric energy back to a power grid. In the practical use of engineering, various conversion functions can be realized only by using one set of device, the used equipment is less, the realization and the expansion are easy, and the engineering cost is lower.
The DC-AC inverter circuit and the AC-DC rectifier circuit are two independent conversion circuits on the traditional equipment, the control principles are different, the DC-AC inverter circuit and the AC-DC rectifier circuit are combined into one circuit, the unified coordination management is realized, and the topological structure of the conversion circuit is difficult. The DC-AC inverter circuit is actually a direct current boosting process in the middle of circuit conversion, and then is inverted into alternating current to be supplied to alternating current equipment or directly fed back to a power grid, so that the aim of checking, discharging and maintaining the storage battery pack is fulfilled; and the AC-DC rectification is actually a direct current voltage reduction process in the middle process of circuit conversion, so that the storage battery pack is charged. A Boost chopper circuit and a Buck Buck circuit are adopted in the principle of a circuit topological structure, and a bidirectional mutual conversion circuit is realized through a fusion design.
The grid-connected and off-grid type high-power bidirectional converter device 2 can realize a grid-connected and off-grid operation mode, also realize the charging and intelligent checking and discharging maintenance of the energy storage battery pack 1, feed the discharged electric energy back to a power grid, save energy and facilitate the effective maintenance of the energy storage battery pack 1 according to the national storage battery maintenance regulations.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (9)
1. A grid-connected and off-grid high-power bidirectional converter device is characterized by comprising
The direct current side trimming filter circuit is connected between a direct current power supply and the bidirectional converter circuit (8);
the bidirectional converter circuit (8) is used for inverting/rectifying mutual conversion and switching the discharging/charging state of the energy storage battery pack (1);
an AC side filter circuit connected between the bidirectional converter circuit (8) and an AC power supply;
and the signal acquisition and control circuit is used for transmitting the acquired direct-current side electrical acquisition signals, the acquired alternating-current side electrical acquisition signals and the conversion circuit control communication signals to a corresponding interface of the central acquisition control unit (15) to form a closed-loop control circuit, charging the energy storage battery pack (1), or discharging and maintaining the energy storage battery pack (1), and feeding the discharged electric energy back to the power grid.
2. The grid-connected and grid-disconnected high-power bidirectional converter device according to claim 1, wherein the bidirectional converter circuit (8) comprises a V2 end and a V1 end, a capacitor C1 is connected in parallel between the positive pole and the negative pole of V1, a capacitor C2 is connected in parallel between the positive pole and the negative pole of V2, a diode D1 and a diode D2 are connected in series, a capacitor Cr1 is connected in parallel between the two ends of a diode D1, a capacitor Cr2 is connected in parallel between the two ends of a diode D2, the positive pole of a diode D2 is grounded, and the negative pole of a diode D1 is connected with the positive pole of the V2 end and the capacitor C2; a series node of the diode D1 and the diode D2 is connected with a series node of the inductor Lr1 and the inductor Lr2, the inductor Lr1 is connected with the S pole of the switching tube S1, the D pole of the switching tube S1 is connected with the negative pole of the diode D1, the inductor Lr2 is connected with the D pole of the switching tube S2, and the S pole of the switching tube S2 is grounded; the series node of the inductor Lr1 and the inductor Lr2 is connected with one end of the inductor L, and the other end of the inductor L is connected with the anodes of the capacitors C1 and V1.
3. The grid-connected and grid-disconnected high-power bidirectional converter device according to claim 2, characterized in that the switching tube S2 is controlled to be always kept in an off state, the converter is operated by controlling the on/off of the switching tube S1, the inductor L, the inductor Lr2, the switching tube S2, the diode D1 and the capacitor Cr1 form a boost complex resonant converter, the whole system energy is transferred from the V1 end to the V2 end, and at this time, the battery pack connected to the V1 end is in a discharge maintenance state.
4. The grid-connected and off-grid high-power bidirectional converter device as claimed in claim 2, wherein the switching tube S2 is controlled to be always kept in an off state, the converter is operated by controlling the on-off state of the switching tube S1, the switching tube S1, the inductor Lr1, the inductor L, the diode D2 and the capacitor Cr2 form a buck-type complex resonant converter, the whole system energy is transmitted from the V2 end to the V1 end, and the battery pack connected to the V1 end is in a charging state.
5. The grid-connected and off-grid high-power bidirectional converter device according to claim 2, wherein the dc-side trimming filter circuit comprises a dc voltage transient suppressor (13), a dc-side switch (5), a dc-side electromagnetic interference filter (6), and a dc bus (7); the direct current power supply is connected with a direct current side switch (5) through a direct current voltage transient suppressor (13), a direct current bus (7) is formed after filtering through a direct current side electromagnetic interference filter (6), and the direct current bus (7) is connected with the V1 end of a bidirectional converter circuit (8).
6. The grid-connected and grid-disconnected high-power bidirectional converter device according to claim 2, wherein the ac-side filter circuit comprises an isolation transformer (9), an ac-side filter (10), an ac-side electromagnetic interference filter (11), an ac-side switch (12), and an ac voltage transient suppressor (14), wherein a V2 terminal of the bidirectional converter circuit (8) is connected to the ac-side filter (10) through the isolation transformer (9), and is connected to an ac power supply terminal after passing through the ac-side switch (12) and the ac voltage transient suppressor (14) in sequence after being filtered by the ac-side electromagnetic interference filter (11).
7. The grid-connected off-grid high-power bidirectional converter device according to claim 2, wherein the bidirectional converter device (2) provides four system operation modes: the system comprises a single machine off-grid operation mode, a single machine grid-connected operation mode, a parallel machine off-grid operation mode and a parallel machine grid-connected operation mode.
8. The grid-connected and off-grid high-power bidirectional converter device according to claim 2, wherein the switching tubes S1 and S2 are N-channel field effect transistors.
9. The grid-connected and off-grid high-power bidirectional converter device according to claim 1, wherein the chassis (16) is provided with a direct current interface (17), a communication interface (18), an alternating current interface (19) and heat dissipation holes (20); the direct current interface (17) is connected with a direct current power supply end, the communication interface (18) is connected with a communication interface of the central acquisition control unit (15), and the alternating current interface (19) is connected with an alternating current power supply end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210530193.6A CN114825406A (en) | 2022-05-16 | 2022-05-16 | Grid-connected and off-grid type high-power bidirectional converter device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210530193.6A CN114825406A (en) | 2022-05-16 | 2022-05-16 | Grid-connected and off-grid type high-power bidirectional converter device |
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| CN114825406A true CN114825406A (en) | 2022-07-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117977698A (en) * | 2024-04-01 | 2024-05-03 | 深圳市正浩智造科技有限公司 | Control method of bidirectional AC/DC converter and power equipment |
| CN118232385A (en) * | 2024-04-26 | 2024-06-21 | 安徽明生恒卓科技有限公司 | Energy storage converter system applied to intelligent power grid area |
-
2022
- 2022-05-16 CN CN202210530193.6A patent/CN114825406A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117977698A (en) * | 2024-04-01 | 2024-05-03 | 深圳市正浩智造科技有限公司 | Control method of bidirectional AC/DC converter and power equipment |
| CN118232385A (en) * | 2024-04-26 | 2024-06-21 | 安徽明生恒卓科技有限公司 | Energy storage converter system applied to intelligent power grid area |
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