CN103010868B - Elevator energy-saving system and control method thereof - Google Patents
Elevator energy-saving system and control method thereof Download PDFInfo
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- CN103010868B CN103010868B CN201110288745.9A CN201110288745A CN103010868B CN 103010868 B CN103010868 B CN 103010868B CN 201110288745 A CN201110288745 A CN 201110288745A CN 103010868 B CN103010868 B CN 103010868B
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Abstract
The invention discloses an elevator energy-saving system, which comprises an energy storage device, a charging and discharging controller and a rectification circuit, wherein an alternating current side of the rectification circuit is electrically connected with an external power source, or is electrically connected with the other alternating current power source independent from the external power source; a switch controller is respectively connected with a bus voltage detector, a current detector and a power switch through signal lines; and turning on and off of the power switch are controlled by the switch controller, so that transmission of regenerated energy to a second direct current bus can be realized, so as to supply power to non-motor load of an elevator. With the adoption of the elevator energy-saving system and the control method thereof, not only can the regenerated energy be stored when a motor of the elevator is in a regenerated state, and is the stored energy released to the first direct current bus to provide electric energy for the motor of the elevator, so as to realize energy saving of the elevator when the motor of the elevator is in an electrical state, but also the regenerated energy is preferentially provided to the non-motor load of the elevator, so as to improve the ability of continuously regenerating of the energy storage device corresponding to the elevator. The elevator energy-saving system also discloses a control method of the elevator energy-saving system.
Description
Technical field
The present invention relates to a kind of energy saving system of elevator, particularly relate to a kind of energy saving system of elevator that utilizes closed-center system to realize elevator energy-saving.The invention still further relates to the control method of this energy saving system of elevator.
Background technology
In recent years, utilize closed-center system to solve the processing problem of the regenerated energy of elevator motor generation in service, realize elevator energy-saving has become the study hotspot of elevator industry simultaneously.Because elevator in some special occasions there will be the situation of cyclic regeneration operation.In this case, if the capacity of energy storing device of elevator arrangement is less, can occur to cause because of the capacity limit of closed-center system the problem that cannot the regenerated energy producing after closed-center system full charge be stored and be recycled.Can address the above problem by the memory capacity that increases closed-center system, but can cause cost to increase.
Japanese Patent Laid-Open 2005-343574 discloses the changer that a kind of utilization sets up and will exceed the Way of Regenerating Energy Feedback of closed-center system storage to the method for electrical network, but the method has increased cost, and the electric energy of feedback many times can not, for client brings income, also may served potential adverse effect to electrical network band.It is that closed-center system is set different charging expected values that Chinese invention patent specification sheets CN1197753C proposes in different time sections, but its charging expected value is for presetting, cannot tackle flexibly the variation of elevator environment for use, and its closed-center system is configured to discharge in the time that charge volume exceedes the electric operation of the expected value of charging, thereby the problem that closed-center system cannot discharge while there will be elevator out of service.
Chinese invention patent application Publication Specification CN102101615A (application number: 201010258222.5, open day: on June 22nd, 2011) according to through infer obtain future energy savings amount and its specified value between magnitude relationship, in the time that energy savings in future amount exceedes its specified value, make closed-center system discharge and prepare in advance storage space for coming elevator cyclic regeneration.But in this scheme, 1) inferring of energy savings amount is very complicated in the future; 2) be converted to electronic instantaneously by regeneration at elevator motor, owing to cannot guaranteeing that vdc command value is necessarily greater than the actual value of vdc, therefore may occur the phenomenon that closed-center system can not discharge in time; 3) although future time point has material impact to energy savings in future amount definite, but this patent is only mentioned " can be the measurement interval of described consumption of current; can be also the predefined interval such as hour ", lacks clear and definite, perfect future time point and determines method; 4) closed-center system only discharges in the time that energy savings in future amount exceedes its specified value, if now elevator car lighting and/or control setup are because elevator is in the time that energy-saving mode power is very low, and the phenomenon that there will be closed-center system to discharge rapidly; 5) do not illustrate all or part of elevator car lighting and/or the control setup of offering of the regenerated energy how only by " the second inverter ", closed-center system being discharged.
Chinese invention patent application Publication Specification CN1696036A (application number: CN200410068510.9, open day: on November 16th, 2005) utilize shifter in the time that power supply has a power failure, by power-converting device, electrical storage device is connected to supply unit, by power-converting device, electrical storage device is only connected to the car intraoral illumination of elevator electrical equipment simultaneously.Arranging of shifter can increase system cost and complexity, and because shifter is to complete switching according to the check result of the detector that stops sending a telegram in reply, like this by power supply have a power failure → detect result → transmission testing result → switch, unavoidably there will be long or short interval, obviously can have a negative impact to elevator device performance.
Therefore, develop a kind of energy saving system of elevator without increase the memory capacity of closed-center system and just can effectively utilize regenerated energy, overcome the shortcoming of existing public technology simultaneously, just become and utilize closed-center system to process elevator regenerated energy, realize of elevator energy-saving and have important topic to be solved.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of energy saving system of elevator that just can carry out to regenerated energy effective utilization without the memory capacity that increases closed-center system, overcome existing public technology simultaneously and cause cost to increase because setting up changer, cannot tackle flexibly that elevator environment for use changes and elevator time out of service closed-center system cannot discharge and closed-center system cannot be in time, rapidly, the problem such as reliable electric discharge, time gap setting complexity.
For solving the problems of the technologies described above, the technical solution of energy saving system of elevator of the present invention is:
Comprise closed-center system, charging-discharging controller, charge-discharge circuit, closed-center system state detector, energy consumption circuit, energy consumption controller, bus voltage detector; External power supply is connected with the three-phase alternating current side of rectifier, and the DC side of rectifier is connected with the DC side input end of inverter through the first DC bus; Smooth direct current electric capacity and energy consumption circuit are connected across respectively the first DC bus two ends, and bus voltage detector is arranged on the two ends of smooth direct current electric capacity; Energy consumption controller is controlled energy consumption circuit; The three-phase alternating current side of inverter is connected with elevator motor through current probe; Elevator driving controller is controlled inverter, makes elevator motor drag car and moves in hoistway; Closed-center system is connected across the first DC bus two ends through charge-discharge circuit; Closed-center system is connected with charging-discharging controller through closed-center system state detector by signal wire (SW); Charging-discharging controller is connected with bus voltage detector and charge-discharge circuit respectively by signal wire (SW); Also comprise rectifying circuit, the AC of rectifying circuit is electrically connected with external power supply or is electrically connected with another source of AC that is independent of external power supply, the DC side of rectifying circuit is electrically connected with the DC side of power-converting device through the second DC bus, and the AC of power-converting device is electrically connected with the non-motor load of elevator; DC capacitor is connected across the second DC bus two ends; The anode of the first DC bus is electrically connected with the anode of the second DC bus through power switch, reactor, current probe; On off controller is connected with bus voltage detector, current probe, power switch respectively by signal wire (SW); Described charging-discharging controller is controlled described charge-discharge circuit; Described on off controller is controlled the opening with shutoff of power switch being arranged between the first DC bus and the second DC bus, realizes by this transmission of regenerated energy to the second DC bus, and then to the non-motor load power supply of elevator.
The present invention also provides a kind of control method of energy saving system of elevator, and its technical solution is:
The bus voltage V at the first DC bus two ends that described energy consumption controller detects according to bus voltage detector
dcon-off element in energy consumption circuit is opened and turn-offed control; The bus voltage V of the first DC bus that described charging-discharging controller detects according to bus voltage detector
dcand command value V
scdcrefto bus voltage V
dccarry out closed loop control; The bus voltage V of the first DC bus that described on off controller detects according to bus voltage detector
dcand command value V
dcrefto bus voltage V
dccarry out closed loop control; The first DC bus-bar voltage command value V in described charging-discharging controller
scdcrefwith the first DC bus-bar voltage command value V on off controller
dcrefmeet following relation:
V
dcrecmax＜V
dcpre＜V
dcref＜V
scdcref＜V
dcnhmin
Or V
dcrecmax< V
dcref< V
scdcref< V
dcnhmin;
Wherein, V
dcprethe pre-charge voltage at the first DC bus two ends, V
dcrecmaxthe maximum vdc of rectifier output, V
dcnhminthe voltage that quits work of energy consumption circuit.
The present invention also provides another kind of energy saving system of elevator, and its technical solution is:
Also comprise elevator motor state identification device, described elevator driving controller is connected with elevator motor state identification device by signal wire (SW), and elevator motor state identification device is connected with charging-discharging controller, on off controller by signal wire (SW); Described elevator motor state identification device according to one or more in the electric current of the weighing result from elevator driving controller, speed, acceleration/accel, service direction, elevator motor or its command value determine described elevator motor in stopping, electronic, wherein a kind of state in regenerating; Described charging-discharging controller is controlled described charge-discharge circuit; Described on off controller is controlled opening with shutoff of described power switch.
The present invention also provides the control method of another kind of energy saving system of elevator, and its technical solution is:
The bus voltage V at the first DC bus two ends that described energy consumption controller detects according to bus voltage detector
dcon-off element in energy consumption circuit is opened and turn-offed control; The bus voltage V at the first DC bus two ends that described charging-discharging controller detects according to bus voltage detector
dcand command value V
scdcref, the closed-center system that detects of closed-center system state detector charge condition SOC and charging and discharging currents i
sc, the elevator motor that detects of elevator motor state identification device mode of operation, described charge-discharge circuit is controlled; The bus voltage V at the first DC bus two ends that described on off controller detects according to bus voltage detector
dcand command value V
dcref, current i between current probe the first DC bus and the second DC bus that detect
load, the elevator motor that detects of elevator motor state identification device mode of operation, opening with shutoff of described power switch controlled.
The method that described charging-discharging controller is controlled described charge-discharge circuit is:
When elevator motor is during in halted state, described charging-discharging controller adopts charge condition and charging and discharging currents double circle structure to control charge-discharge circuit, and charge condition command value SOC
ref=SOC
min; Described on off controller adopts voltage and current double closed-loop structure to control power switch, and bus voltage command value V in voltage control
dcref> V
dcpre> V
dcrecmax, as the current instruction value i of Voltage loop output
loadreffor timing, by its zero setting, when it is when negative, do not deal with, wherein: it is positive dirction that electric current flows to the first DC bus by the second DC bus;
When elevator motor is during in motoring condition, described charging-discharging controller adopts charge condition and charging and discharging currents double circle structure to control charge-discharge circuit, and charge condition command value SOC
ref=SOC
min; Described on off controller adopts voltage and current double closed-loop structure to control power switch, and bus voltage command value V in voltage control
dcref> V
dcrecmax, as the current instruction value i of Voltage loop output
loadreffor timing, by its zero setting, when it is when negative, do not deal with, wherein: it is positive dirction that electric current flows to the first DC bus by the second DC bus;
When elevator motor is during in reproduced state, described charging-discharging controller adopts voltage and current double closed-loop structure to bus voltage V
dccarry out closed loop control, and if SOC
ref=SOC
max, by current instruction value i
screfzero setting, V
scdcref> V
dcrecmax; Described on off controller adopts voltage and current double closed-loop structure to control power switch (23), and bus voltage command value V in voltage control
dcref> V
dcrecmax, as the current instruction value i of Voltage loop output
loadreffor timing, by its zero setting, when it is when negative, do not deal with, wherein: it is positive dirction that electric current flows to the first DC bus by the second DC bus.
The present invention also provides the third energy saving system of elevator, and its technical solution is:
Also comprise the detector of sending a telegram in reply that stops for detection of the power supply state of external power supply, the detector that stops sending a telegram in reply is connected with described external power supply and described on off controller by signal wire (SW); Described on off controller has two kinds of master modes: normal master mode and power failure master mode; The power supply state of the external power supply that described on off controller detects according to the detector that stops sending a telegram in reply, controls power switch.
The present invention also provides the control method of the third energy saving system of elevator, and its technical solution is:
The bus voltage V at the first DC bus two ends that described energy consumption controller detects according to bus voltage detector
dcon-off element in energy consumption circuit is opened and turn-offed control; The bus voltage V of the first DC bus that described charging-discharging controller detects according to bus voltage detector
dcand command value V
scdcrefto bus voltage V
dccarry out closed loop control;
The first DC bus-bar voltage command value V in described charging-discharging controller
scdcrefwith the first DC bus-bar voltage command value V on off controller
dcrefmeet following relation:
V
dcrecmax＜V
dcpre＜V
dcref＜V
scdcref＜V
dcnhmin
Or V
dcrecmax< V
dcref< V
scdcref< V
dcnhmin;
Wherein, V
dcprethe pre-charge voltage at the first DC bus two ends, V
dcrecmaxthe maximum vdc of rectifier output, V
dcnhminthe voltage that quits work of energy consumption circuit;
Described on off controller to the control method of power switch is:
In the time that the detector that stops sending a telegram in reply detects external power supply supply regular power, the bus voltage V at the first DC bus two ends that described on off controller detects according to bus voltage detector
dcand command value V
dcref, current i between current probe the first DC bus and the second DC bus that detect
load, adopt voltage and current double closed-loop structure to control opening with shutoff of power switch;
In the time that the detector that stops sending a telegram in reply detects that external power supply has a power failure, the bus voltage V at the second DC bus two ends that described on off controller detects according to the second bus voltage detector
loaddcand command value V
loaddcref, current i between current probe the first DC bus and the second DC bus that detect
load, adopt voltage and current double closed-loop structure to control opening with shutoff of power switch.
The beneficial effect that the present invention can reach is:
1) thus stored energy being released into DC bus during at elevator motor when operation regeneration storing, regenerating energy, at elevator motor electric operation offers elevator motor for its electric operation, therefore can realize elevator energy-saving;
2) power to improve the ability of closed-center system reply elevator cyclic regeneration by as much as possible closed-center system being maintained to its minimum charge condition and maximally utilising regenerated energy for the non-motor load of elevator, thereby in the case of not increasing the memory capacity of closed-center system, realize the effective utilization to regenerated energy;
3) can discharge at any time, make the charge condition of closed-center system reach as early as possible its lower limit SOC
min;
4) feed circuit and the control method thereof that provide non-elevator motor to load;
5) in the time that having a power failure, realized power supply the seamless switching to closed-center system power supply by Power supply;
6) overcome that existing public technology cannot tackle that elevator environment for use changes flexibly and elevator time out of service closed-center system cannot discharge and closed-center system cannot reliably discharge, time gap is set the problems such as complexity.
The present invention not only can be in the time that elevator motor be reproduced state storing, regenerating energy, thereby stored energy is released into the first DC bus at elevator motor during for motoring condition and realizes elevator energy-saving for elevator motor provides electric energy, and improve the ability of the corresponding elevator cyclic regeneration of closed-center system by preferentially regenerated energy being offered to the non-motor load of elevator.
Brief description of the drawings
Fig. 1 is the overall structure schematic diagram of the embodiment mono-of energy saving system of elevator of the present invention;
Fig. 2 is the charging-discharging controller schematic diagram of the embodiment mono-of energy saving system of elevator control method of the present invention;
Fig. 3 is the on off controller schematic diagram of the embodiment mono-of energy saving system of elevator control method of the present invention;
Fig. 4 is the overall structure schematic diagram of the embodiment bis-of energy saving system of elevator of the present invention;
Fig. 5 is the charging-discharging controller schematic diagram of the embodiment bis-of energy saving system of elevator control method of the present invention;
Fig. 6 is the overall structure schematic diagram of the embodiment tri-of energy saving system of elevator of the present invention.
Nomenclature in figure:
1, external power supply 2, rectifier 3, smooth direct current electric capacity
4, bus voltage detector 5, energy consumption circuit 6, the first DC bus
7, inverter 8, current probe 9, elevator motor
10, traction sheave 11, track adjusting wheel 12, counterweight
13, car 14, speed detector 15, elevator driving controller
16, energy consumption controller 17, closed-center system state detector
18, charging-discharging controller 19, charge-discharge circuit 20, closed-center system
21, on off controller 23, power switch 24, reactor
25, rectifying circuit 26, DC capacitor 27, power-converting device
28, the non-motor load 29 of elevator, the second DC bus 30, current probe
31 elevator motor state identification devices 32, bus voltage detector
33, stop the detector of sending a telegram in reply
V
dcit is the bus voltage at the first DC bus two ends
V
scdcreffor the first DC bus-bar voltage command value in charging-discharging controller
V
dcreffor the first DC bus-bar voltage command value on off controller
V
dcpreit is the pre-charge voltage at the first DC bus two ends
V
dcnhmaxfor the trigger voltage of energy consumption circuit
V
dcnhminfor the voltage that quits work of energy consumption circuit
V
loaddcit is the bus voltage at the second DC bus two ends
V
loaddcrefit is the second DC bus-bar voltage command value
V
dcrecmaxfor the maximum vdc of rectifier output
I
scref0for the primary current command value in charging-discharging controller
I
screffor the ultimate current command value in charging-discharging controller
I
loadref0for the primary current command value on off controller
I
loadreffor the ultimate current command value on off controller
I
loaddC current between the first DC bus and the second DC bus detecting for current probe
I
scfor the charging and discharging currents of closed-center system
SOC is the charge condition of the closed-center system that detects of closed-center system state detector
SOC
minfor the minimum value of the charge condition of closed-center system
SOC
maxfor the maxim of the charge condition of closed-center system
SOC
reffor the charge condition command value of closed-center system
P
scmaxfor the maximum of closed-center system discharges and recharges power
P
motorfor the power of elevator motor
P
loadfor the power of the non-motor load of elevator
P
loadmaxfor the maximum power of the non-motor load of elevator
Below in conjunction with accompanying drawing and detailed description of the invention, the present invention is further detailed explanation:
Detailed description of the invention
Embodiment mono-
Referring to Fig. 1, in the embodiment mono-of described energy saving system of elevator, external power supply 1 is connected with the three-phase alternating current side of rectifier 2, the DC side of rectifier 2 is connected with the DC side input end of inverter 7 through the first DC bus 6, smooth direct current electric capacity 3 and energy consumption circuit 5 are connected across respectively the first DC bus 6 two ends, bus voltage detector 4 is arranged on the two ends of smooth direct current electric capacity 3, the three-phase alternating current side of inverter 7 is connected with elevator motor 9 through current probe 8, elevator motor 9 is connected with traction sheave 10 through ad hoc structure, car 13 with counterweight 12 by rope hanging in the both sides of traction sheave 10 and track adjusting wheel 11.Elevator driving controller 15 generates the control signal to inverter 7 according to the allotment order of instruction or group control system in floor call, sedan-chair and the actual speed of the detected elevator motor 9 of speed detector 14 and the current detecting result of current probe 8, makes elevator motor 9 drag car 13 and moves in hoistway.Energy consumption controller 16 is at the bus voltage V at the first DC bus 6 two ends
dchigher than the trigger voltage V of energy consumption circuit
dcnhmaxin time, enables power consumption road 5 and is converted into heat energy and consumes being accumulated in regenerated energy in the first DC bus 6 with turn-offing by controlling opening of on-off element in energy consumption circuit 5.
For storing the regenerated energy producing when elevator motor regeneration moves, and the elevator closed-center system 20 that stored energy is released into the first DC bus 6 in suitable situation is connected across the two ends of the first DC bus 6 through charge-discharge circuit 19, by detecting the terminal voltage of described closed-center system 20, the closed-center system state detector 17 that the combination of one or more characteristics of charging and discharging currents and temperature realizes the detection to the charge condition of described closed-center system 20 and charging and discharging currents is connected with closed-center system 20 and charging-discharging controller 18 by signal wire (SW), the charging-discharging controller 18 that is used for controlling the energy flow between the first DC bus 6 and described closed-center system 20 is by signal wire (SW) and closed-center system state detector 17, bus voltage detector 4 is connected with charge-discharge circuit 19.The AC of rectifying circuit 25 is electrically connected with external power supply 1, DC side is electrically connected with the DC side of power-converting device 27 through the second DC bus 29, and the AC of power-converting device 27 is electrically connected with the non-motor load 28 of elevator; DC capacitor 26 is connected across the second DC bus 29 two ends; The anode of the first DC bus 6 is electrically connected with the anode of the second DC bus 29 through power switch 23, reactor 24, current probe 30, and current probe 30 is for detection of the electric current that is flowed to the second DC bus 29 by the anode of the first DC bus 6; The on off controller of opening with turn-offing 21 for power ratio control switch 23 is connected with bus voltage detector 4 and power switch 23 by signal wire (SW).
The bus voltage at the first DC bus 6 two ends that energy consumption controller 16 detects according to bus voltage detector 4 is opened the on-off element in energy consumption circuit 5 and is turn-offed control.
Energy consumption controller 16 is controlled energy consumption circuit 5 in the following way: as the bus voltage V at the first DC bus 6 two ends
dchigher than the trigger voltage V of energy consumption circuit
dcnhmaxtime, start energy consumption circuit 5 by the on-off element of opening in energy consumption circuit 5; As the bus voltage V at the first DC bus 6 two ends
dclower than the voltage V that quits work of energy consumption circuit
dcnhmintime, stop energy consumption circuit 5 by the on-off element disconnecting in energy consumption circuit 5.
The bus voltage V at the first DC bus (6) two ends that described charging-discharging controller 18 detects according to bus voltage detector 4
dcand command value V
scdcrefto bus voltage V
dccarry out closed loop control, specifically as shown in Figure 2, the first DC bus-bar voltage command value V
scdcrefthe the first DC bus-bar voltage V detecting with bus voltage detector 4
dcbe admitted to a subtracter as incoming signal together, the difference obtaining after subtraction is admitted to a voltage controller, and the output of voltage controller directly or after the processing such as amplitude limit and/or filtering, be the primary current command value i of current control unit
scref0;
Primary current command value i
scref0be admitted to a current instruction value amending unit as incoming signal, the primary current command value i of the charge condition (State Of Charge, SOC) of the closed-center system 20 that current instruction value amending unit detects according to closed-center system state detector 17 to input
scref0do following correction:
As SOC≤SOC
mintime,
If i
scref0> 0, makes i
scref=0; If i
scref0≤ 0, make i
scref=i
scref0
Work as SOC
min≤ SOC≤SOC
maxtime, i
scref=i
scref0
As SOC>=SOC
maxtime,
If i
scref0≤ 0, make i
scref=0; If i
scref0> 0, makes i
scref=i
scref0regulation: electric current flows to the first DC bus 6 for positive dirction by closed-center system 20.
Certainly, current instruction value amending unit can also take alternate manner to primary current command value i
scref0revise, as: SOC closed on
minand SOC
maxeach selected certain limit, in the time that the SOC of closed-center system 20 is not in above-mentioned scope according to above-mentioned rule to primary current command value i
scref0revise, in the time that the SOC of closed-center system 20 is positioned at above-mentioned selected scope, further to primary current command value i
scref0carry out amplitude limit, SOC and the SOC of amplitude limit value size and closed-center system 20
minor SOC
maxbetween the absolute value of difference be directly proportional.
The current instruction value i of current instruction value amending unit output
screfthe charging and discharging currents i of the closed-center system 20 detecting with closed-center system state detector 17
scbe admitted to another subtracter as incoming signal together, the difference obtaining after subtraction is admitted to a current controller, the output of current controller is admitted to charge-discharge circuit 19 as the control signal of charging-discharging controller 18, by the device for power switching in charge-discharge circuit 19 being turned on and off to the control of controlling to realize the charging and discharging currents to closed-center system 20, realize by this transmission of electric energy between closed-center system 20 and the first DC bus 6.
As shown in the above description, the bus voltage V of charging-discharging controller 18 to the first DC bus 6 two ends
dccontrol method comprise the following steps:
The bus voltage V at step 1, the first DC bus 6 two ends of being detected according to bus voltage detector 4 by voltage control unit
dcand command value V
scdcrefgenerate the primary current command value i of current control unit
scref0;
Step 2, primary current command value i step 1 being obtained by current instruction value pretreatment unit
scref0carry out amplitude limit and filtering processing; (note: this step also can be omitted)
Step 3, primary current command value i step 2 being obtained by current instruction value amending unit
scref0revise and obtain ultimate current command value i
scref;
Step 4, the ultimate current command value i being exported according to current instruction value amending unit by current control unit
screfcharging and discharging currents to closed-center system 20 is controlled, and makes its follow current command value.
The bus voltage V at the first DC bus 6 two ends that described on off controller 21 detects according to bus voltage detector 4
dcand command value V
dcrefto bus voltage V
dccarry out closed loop control, specifically as shown in Figure 3, the first DC bus-bar voltage command value V on off controller 21
dcrefthe bus voltage V at the first DC bus 6 two ends that detect with bus voltage detector 4
dcbe admitted to a subtracter as incoming signal together, the difference obtaining after subtraction is admitted to a voltage controller, and the output of voltage controller directly or after the processing such as amplitude limit and/or filtering, be the primary current command value i of current control unit
loadref0;
Primary current command value i
loadref0be admitted to a current instruction value amending unit as incoming signal, the primary current command value i of current instruction value amending unit to input
loadref0revise, make to work as i
loadref0when > 0, make i
loadref=0, work as i
loadref0≤ 0, make i
loadref=i
loadref0, regulation: electric current flows to the first DC bus 6 for positive dirction by the second DC bus 29;
The current instruction value i of current instruction value amending unit output
loadrefthe current i detecting with current probe 30
loadbe admitted to another subtracter as incoming signal together, the difference obtaining after subtraction is admitted to a current controller, the output of current controller is admitted to power switch 23 as the control signal of on off controller 21, control to realize the control to the electric current between the second DC bus 29 and the first DC bus 6 by power switch 23 is turned on and off, realize by this electric energy transmission to the second DC bus 29 at the first DC bus 6.
The bus voltage V of described on off controller 21 to the first DC bus 6 two ends
dccontrol method comprise the following steps:
The bus voltage V at step 1, the first DC bus 6 two ends of being detected according to bus voltage detector 4 by voltage control unit
dcand command value V
dcrefgenerate the primary current command value i of current control unit
loadref0;
Step 2, primary current command value step 1 being obtained by current instruction value pretreatment unit are carried out amplitude limit and filtering processing; (note: this step also can be omitted)
Step 3, primary current command value i step 2 being obtained by current instruction value amending unit
loadref0revise and obtain ultimate current command value i
loadref;
Step 4, the ultimate current command value i being exported according to current instruction value amending unit by current control unit
loadrefelectric current to the power switch 23 of flowing through is controlled, and makes its follow current command value.
The first DC bus-bar voltage command value V in above-mentioned charging-discharging controller 18
scdcrefwith the first DC bus-bar voltage command value V in above-mentioned on off controller 21
dcrefmeet: V
dcrecmax< V
dcpre< V
dcref< V
scdcref< V
dcnhminor V
dcrecmax< V
dcref< V
scdcref< V
dcnhmin, wherein, V
dcprebe the pre-charge voltage at the first DC bus 6 two ends, conventionally meet V
dcrecmax< V
dcpre, V
dcrecmaxthe maximum vdc that rectifier 2 is exported, V
dcnhminthe voltage that quits work of energy consumption circuit 5.
Described energy consumption controller 16 to the control method of energy consumption circuit 5 is: as the bus voltage V at the first DC bus 6 two ends
dchigher than the trigger voltage V of energy consumption circuit
dcnhmaxtime, start energy consumption circuit 5 by the on-off element of opening in energy consumption circuit 5; As the bus voltage V at the first DC bus 6 two ends
dclower than the voltage V that quits work of energy consumption circuit
dcnhmintime, stop energy consumption circuit 5 by the on-off element disconnecting in energy consumption circuit 5.
Its principle of work is as follows:
In the time that elevator motor 9 stops, because elevator generally all arranges a precharge loop (not shown in figure 1), for the first DC bus 6 is carried out to precharge, and pre-charge voltage V
dcprebe greater than the maximum vdc V that rectifier 2 or rectifying circuit 25 are exported
dcrecmax, therefore its main circuit voltage V
dc=V
dcpre> V
dcrecmax.Due to the voltage instruction value V of the first DC bus in the voltage control unit of charging-discharging controller 18
scdcref> V
dc=V
dcpre, voltage control unit is exported a primary current command value i like this
scref0> 0, this primary current command value i
scref0after being admitted to current instruction value amending unit as input, obtain ultimate current command value, and as SOC≤SOC
mintime, i
scref=0, closed-center system 20 does not does not discharge and recharge, and works as SOC
min≤ SOC≤SOC
maxtime, i
scref=i
scref0> 0, charging-discharging controller 18, by charge-discharge circuit 19 is controlled closed-center system 20 is discharged, therefore makes the first DC bus-bar voltage V
dcraise, if do not consider the impact of on off controller 21 and power switch 23, the first DC bus-bar voltage V
dcto be increased to its command value V
scdcref.On the other hand, due to the first DC bus-bar voltage command value V in the voltage control unit of on off controller 21
dcrefmeet V
dcrecmax< V
dcpre< V
dcref< V
dc=V
scdcref< V
dcnhmin, the primary current command value i of voltage control unit output like this
loadref0< 0, this primary current command value i
scref0after being admitted to current instruction value amending unit as input, obtain ultimate current command value, due to i
loadref0< 0, has i
loadref=i
loadref0, also, because the terminal voltage of the second DC bus 29 is lower than the terminal voltage of the first DC bus 6, on off controller 21 makes electric energy be transmitted to the second DC bus 29 by the first DC bus 6 by power switch 23 is controlled.Like this, in the time that elevator motor 9 stops, if SOC≤SOC
min, charging-discharging controller 18 to the control of charge-discharge circuit 19 under, closed-center system 20 does not discharge, the terminal voltage of the first DC bus 6 does not raise, V
dcref> V
dc, now on off controller 21 to the control action of power switch 23 under, electric energy be can't help the first DC bus 6 and is transmitted to the second DC bus 29, thereby does not power to the non-motor load 28 of elevator; If SOC > is SOC
min, charging-discharging controller 18 to the control of charge-discharge circuit 19 under, closed-center system 20 discharges to the first DC bus 6, the terminal voltage of the first DC bus 6 raises, and works as V
dcref< V
dctime, on off controller 21 to the control action of power switch 23 under, electric energy is transmitted to the second DC bus 29 by the first DC bus 6, thereby does not power to the non-motor load 28 of elevator.
In the time that elevator motor 9 is electronic, if SOC≤SOC
min, the current instruction value amending unit in charging-discharging controller 18 is revised the primary current command value of voltage control unit output, makes i
scref=0, closed-center system 20 does not does not discharge and recharge, and elevator motor 9 is electronic, need provide electric energy to it by the first DC bus 6, the therefore bus voltage V at the first DC bus 6 two ends
dcdrop to V
dcrecmax.Now, closed-center system 20 does not discharge, and external power supply is to the first DC bus 6 and then power to elevator motor 9, and between the first DC bus 6 and the second DC bus 29, electric current is zero, therefore do not power to the non-motor load 28 of elevator, now the required electric energy of elevator motor is provided by external power supply 1.If SOC > is SOC
min, charging-discharging controller 18 to the control action of charge-discharge circuit 19 under, closed-center system 20 discharges to the first DC bus 6 through charge-discharge circuit 19, if further meet P
scmax≤ P
motor, the bus voltage V at the first DC bus 6 two ends
dcdrop to V
dcrecmax, due to V now
dc< V
dcrefbetween the first DC bus 6 and the second DC bus 29, electric current is zero, therefore do not power to the non-motor load 28 of elevator, now, charging-discharging controller 18 to the control action of charge-discharge circuit 19 under, closed-center system 20 discharges to the first DC bus 6 through charge-discharge circuit 19, and the required electric energy of elevator motor 9 is provided jointly by external power supply 1/ and closed-center system 20.If meet P
scmax> P
motor, show that the electric energy that closed-center system 20 discharges to the first DC bus 6 through charge-discharge circuit 19 is providing to elevator motor 9 outside its required electric energy, also have part electric energy to be accumulated on the first DC bus 6, cause the bus voltage V at the first DC bus 6 two ends
dcrise.Work as V
dcexceed V
dcreftime, on off controller 21 makes electric energy be transmitted to the second DC bus 29 by the first DC bus 6 by power switch 23 is controlled, and then powers to the non-motor load 28 of elevator.If further meet P
scmax> P
motor+ P
load, the first DC bus-bar voltage V
dccontinue to rise, work as V
dcexceed V
dcnhmintime, energy consumption controller 16 starts energy consumption circuit 5, is that heat energy discharges by the part electric energy conversion on the first DC bus 6.
In the time that elevator motor 9 is regenerated, the first DC bus-bar voltage V
dcrise.If P
motor≤ P
load, as the first DC bus-bar voltage V
dcrise to V
dcreftime, on off controller 21 makes electric energy be transmitted to the second DC bus 29 by the first DC bus 6 by power switch 23 is controlled, and then powers to the non-motor load 28 of elevator, now V
dcbe stabilized in V
dcref.Due to V now
dclower than V
scdcref, therefore closed-center system 20 does not charge.If P
load≤ P
motor≤ P
load+ P
scmax, the first DC bus-bar voltage V
dcrising to V
dcref, electric energy by the first DC bus 6 to the second DC bus 29 transmit so that power to the non-motor load 28 of elevator after continue to rise, when it rises to the voltage instruction value V of the first DC bus
scdcreftime, if SOC < is SOC
max, charging-discharging controller 18 to the control action of charge-discharge circuit 19 under closed-center system 20 charge, now V
dcbe stabilized in V
dcrefif, SOC>=SOC
max, charging-discharging controller 18 to the control action of charge-discharge circuit 19 under closed-center system 20 do not charge, the first DC bus-bar voltage V
dccontinue to rise.If meet P
load> P
load+ P
scmax, the first DC bus-bar voltage V
dccontinue to rise, at V
dcexceed V
dcnhmintime, energy consumption controller 16 starts energy consumption circuit 5, is that heat energy discharges by the part electric energy conversion on the first DC bus 6.Now, charging-discharging controller 18 to the control action of charge-discharge circuit 19 under closed-center system 20 with P
scmaxcharge, on off controller 21 is by controlling and make electric energy with P power switch 23
loadmaxtransmitted to the second DC bus 29 by the first DC bus 6, and then power to the non-motor load 28 of elevator.
In the present embodiment, the bus voltage V at the first DC bus 6 two ends
dcbus voltage V with the second DC bus 29 two ends
loaddcmeet: V
loaddc≤ V
dc.
Embodiment bis-
Referring to Fig. 4, the embodiment bis-of described energy saving system of elevator is similar to embodiment mono-, therefore only just do not exist together and be illustrated below.
Elevator motor state identification device 31 is connected with elevator driving controller 15, charging-discharging controller 18 and on off controller 21 by signal wire (SW).Be connected with closed-center system state detector 17, bus voltage detector 4, elevator motor state identification device 31 and charge-discharge circuit 19 by signal wire (SW) for the charging-discharging controller 18 of controlling the energy flow between the first DC bus 6 and described closed-center system 20.The on off controller of opening with turn-offing 21 for power ratio control switch 23 is connected with bus voltage detector 4, current probe 30, elevator motor state identification device 31 and power switch 23 by signal wire (SW).
Described elevator motor state identification device 31 according to one or more in the electric current of the weighing result from elevator driving controller 15, speed, acceleration/accel, service direction, elevator motor 9 or its command value determine described elevator motor 9 in stopping, electronic, regenerate in which state.
The mode of operation of the elevator motor 9 that described charging-discharging controller 18 detects according to the charge condition of the bus voltage at the first DC bus 6 two ends, closed-center system 20 and charging and discharging currents, elevator motor state identification device 31 is controlled described charge-discharge circuit 19, the current i that described on off controller 21 detects according to the bus voltage at the first DC bus 6 two ends, current probe 30
load, the elevator motor 9 that detects of elevator motor state identification device 31 mode of operation opening with shutoff of power switch 23 controlled, specific as follows:
When elevator motor 9 is during in halted state or motoring condition,
The mode of operation of the elevator motor 9 that described charging-discharging controller 18 detects according to the charge condition of the bus voltage at the first DC bus 6 two ends, closed-center system 20 and charging and discharging currents, elevator motor state identification device 31 adopts charge condition and charging and discharging currents double circle structure to control charge-discharge circuit 19, and charge condition command value SOC
ref=SOC
min, specific implementation as shown in Figure 5: charge condition command value SOC
reftogether with the SOC of the closed-center system 20 detecting with closed-center system state detector 17, be admitted to a subtracter as incoming signal, the difference obtaining after subtraction is admitted to a charge condition controller, and the output of charge condition controller directly or after the processing such as amplitude limit and/or filtering, be the current instruction value i of current control unit
scref.Regulation: while charging to closed-center system 20, direction of current is positive dirction.Current instruction value i
screfthe charging and discharging currents i of the closed-center system 20 detecting with closed-center system state detector 17
scbe admitted to another subtracter as incoming signal together, the difference obtaining after subtraction is admitted to a current controller, the output of current controller is admitted to charge-discharge circuit 19 as the control signal of charge controller 18, by the device for power switching in charge-discharge circuit 19 being turned on and off to the control of controlling to realize the charging and discharging currents to closed-center system 20, realize by this discharging and recharging of closed-center system 20.In fact, due to charge condition command value SOC
ref=SOC
min, therefore closed-center system 20 or discharge or neither charging also do not discharge, and do not charge.
The situation of on off controller 21 is identical with the on off controller 21 in the embodiment mono-shown in Fig. 3, does not repeat herein.
When elevator motor 9 is during in reproduced state, the situation of charging-discharging controller 18 and on off controller 21 is identical with the on off controller 21 in charging-discharging controller 18 and the embodiment mono-shown in Fig. 3 in the embodiment mono-shown in Fig. 2 respectively, the control method of energy consumption controller 16 is same identical with embodiment mono-, does not repeat herein.
Principle of work is as follows:
In the time that elevator motor 9 stops, if SOC≤SOC
min, closed-center system 20 does not discharge, and external power supply is powered to the first DC bus 6, does not power to the non-motor load 28 of elevator, if SOC > is SOC
min, closed-center system 20 is to be no more than P
loadpower discharge, power to the non-motor load 28 of elevator simultaneously;
In the time that elevator motor 9 is electronic, if SOC≤SOC
min, closed-center system 20 does not discharge, and external power supply is powered to the first DC bus 6, does not power to the non-motor load 28 of elevator, if SOC > is SOC
min, closed-center system 20 discharges to the first DC bus 6 through charge-discharge circuit 19, and if further meet P
scmax≤ P
motor, do not power to the non-motor load 28 of elevator, if further meet P
scmax> P
motor, power to the non-motor load 28 of elevator;
In the time that elevator motor 9 is regenerated, if P
motor≤ P
load, with P
motorpower to the non-motor load 28 of elevator, if P
load≤ P
motor≤ P
load+ P
scmax, with P
loadmaxpower to the non-motor load 28 of elevator, if further meet SOC < SOC
max, with P
motor-P
loadmaxcharge to closed-center system 20, if P
load> P
load+ P
scmax, with P
scmaxcharge to closed-center system 20, with P
loadmaxpower to the non-motor load 28 of elevator, remainder is accumulated on the first DC bus 6, as the first DC bus-bar voltage V
dc>=V
dcnhmintime, energy consumption circuit 5 starts;
Wherein, SOC is the charge condition of the closed-center system 20 that detects of closed-center system state detector 17, SOC
maxand SOC
minrespectively the bound of charge condition SOC, P
scmaxthe maximum that is closed-center system 20 discharges and recharges power, P
motorthe power of elevator motor 9, V
dcthe DC bus-bar voltage of the first DC bus 6, V
dcnhminit is the trigger voltage of energy consumption circuit 5.
In above-described embodiment one and two, for the non-motor load 28 of elevator, when the voltage at the first DC bus 6 two ends is higher than the voltage at the second DC bus 29 two ends, and when on off controller 21 makes electric energy be transmitted to the second DC bus 29 by the first DC bus 6 by power switch 23 is controlled, if the electric energy power transmitting is more than or equal to the non-motor load power P of elevator
loadmax, do not have electric energy to power to the non-motor load 28 of elevator through rectifying circuit 25, the second DC bus 29 and power-converting device 27; When the voltage at the first DC bus 6 two ends is higher than the voltage at the second DC bus 29 two ends, and on off controller 21 makes electric energy be transmitted to the second DC bus 29 by the first DC bus 6 by power switch 23 is controlled, but the electric energy power transmitting is less than the non-motor load power P of elevator
loadmaxtime, electric energy provides part power demand through rectifying circuit 25, the second DC bus 29 and power-converting device 27 to the non-motor load 28 of elevator; When the voltage at the first DC bus 6 two ends, less than or equal to the voltage at the second DC bus 29 two ends, or the complete switch-off power switch 23 of on off controller 21 (refers to turn-off relatively for a long time, of short duration shutoff during the non-PWM of being controls) when electric energy can not be transmitted to the second DC bus 29 by the first DC bus 6, electric energy is powered to the non-motor load 28 of elevator through rectifying circuit 25, the second DC bus 29 and power-converting device 27.
In the present embodiment, the bus voltage V at the first DC bus 6 two ends
dcbus voltage V with the second DC bus 29 two ends
loaddcmeet: V
loaddc≤ V
dc.
In above-described embodiment one and two, the AC of rectifying circuit 25 is to be connected to external power supply 1, in fact, the AC of rectifying circuit 25 can be to be also connected to the second source of AC that is independent of external power supply 1, and in order to ensure the one-way of electric current of 29 of the first DC bus 6 to second DC buss, also can set up a diode between the anode of the second DC bus 29 at the anode of the first DC bus 6.
Embodiment tri-
The integral structure of the present embodiment as shown in Figure 6, has been to set up the detector 33 of sending a telegram in reply that stops of a power supply state for detection of external power supply 1 (be supply regular power or stop power supply) with integrally-built unique difference of embodiment mono-as shown in Figure 1.
Described charging-discharging controller 18 is controlled charge-discharge circuit 19 with the charging-discharging controller control method described in embodiment mono-;
Described on off controller 21 has two kinds of master modes according to the testing result of the detector 33 that stops sending a telegram in reply:
Normal master mode: in the time that the detector 33 that stops sending a telegram in reply detects external power supply 1 supply regular power, the bus voltage V at the first DC bus 6 two ends that described on off controller 21 detects according to bus voltage detector 4
dcand command value V
dcref, the DC current that detects of current probe 30 adopts voltage and current double closed-loop structure to control opening with shutoff of power switch 23, makes the bus voltage V at the first DC bus 6 two ends
dccan follow the tracks of its command value V
dcref;
Power failure master mode: in the time that the detector 33 that stops sending a telegram in reply detects that external power supply 1 has a power failure, the bus voltage V at the second DC bus 29 two ends that described on off controller 21 detects according to the second bus voltage detector 32
loaddcand command value V
loaddcref, the DC current that detects of current probe 30 adopts voltage and current double closed-loop structure to control opening with shutoff of power switch 23, makes the bus voltage V at the second DC bus 29 two ends
loaddccan follow the tracks of its command value V
loaddcref;
The control method of charging-discharging controller 18 is identical with the control method of charging-discharging controller 18 in embodiment mono-and described on off controller 21 respectively with the control method of described on off controller 21 in normal master mode, does not repeat herein.
The control method of described on off controller 21 in power failure master mode is similar to the control method of on off controller 21 described in embodiment mono-, only needs the V in the control structure shown in Fig. 3
dcand V
dcrefreplace with the bus voltage V at the second DC bus 29 two ends
loaddcwith its command value V
loaddcref, and using the output of voltage control unit directly as the current instruction value (deleting original current instruction value amending unit) of current control unit.
Equally, in the present embodiment, the bus voltage V at the first DC bus 6 two ends
dcbus voltage V with the second DC bus 29 two ends
loaddcmeet: V
loaddc≤ V
dc.
Non-motor load 28 power of elevator while power failure in order to reduce external power supply 1, can optionally power to the non-motor load 28 of part elevator as required.
Charge condition controller of the present invention, voltage controller, on off controller and current controller are the controller that includes integration control rule, as common PI controller.
In the present invention, closed-center system is one or more combinations in storage battery, super capacitor, nanometer electric capacity, or one or more combinations of storage battery, super capacitor or nanometer electric capacity and the combination of fuel cell; The charge condition of described closed-center system refers to and can be obtained or can be through calculating the combination of one or more parameters of parameter of the actual energy storage situation that indirectly obtains, can embody described closed-center system or capacity service condition by described charge condition detecting device direct-detection, and the combination of one or more characteristics of voltage, electric current and the temperature of described charge condition detecting device by detecting described closed-center system realizes the detection to described closed-center system charge condition.
Core of the present invention is: utilize on off controller 21 to control the power switch 23 being arranged between the second DC bus 29 and the first DC bus 6, realize by this transmission of regenerated energy to the second DC bus 29, and then power to the non-motor load 28 of elevator.Based on above-mentioned core of the present invention; can on basis of the present invention, do suitably to change; be different from as the AC of rectifying circuit 25 is connected to external power supply 1 second source, change the reactor 24 of its smoothing effect, between the second DC bus 29 and the anode of the first DC bus 6, set up diode to guarantee unidirectional delivery and the DC capacitor 26 etc. of electric energy between the two; these variations all should be considered as extension naturally of the present invention, all should be considered as protection scope of the present invention.
Claims (6)
1. a control method for energy saving system of elevator, is characterized in that: described energy saving system of elevator comprises closed-center system (20), charging-discharging controller (18), charge-discharge circuit (19), closed-center system state detector (17), energy consumption circuit (5), energy consumption controller (16), bus voltage detector (4);
External power supply (1) is connected with the three-phase alternating current side of rectifier (2), and the DC side of rectifier (2) is connected with the DC side input end of inverter (7) through the first DC bus (6); Smooth direct current electric capacity (3) and energy consumption circuit (5) are connected across respectively the first DC bus (6) two ends, and bus voltage detector (4) is arranged on the two ends of smooth direct current electric capacity (3); Energy consumption controller (16) is controlled energy consumption circuit (5); The three-phase alternating current side of inverter (7) is connected with elevator motor (9) through current probe (8); Elevator driving controller (15) is controlled inverter (7), makes elevator motor (9) drag car (13) and moves in hoistway;
Closed-center system (20) is connected across the first DC bus (6) two ends through charge-discharge circuit (19); Closed-center system (20) is connected with charging-discharging controller (18) through closed-center system state detector (17) by signal wire (SW); Charging-discharging controller (18) is connected with bus voltage detector (4) and charge-discharge circuit (19) respectively by signal wire (SW);
Also comprise rectifying circuit (25), the AC of rectifying circuit (25) is electrically connected with external power supply (1) or is electrically connected with another source of AC that is independent of external power supply (1), the DC side of rectifying circuit (25) is electrically connected with the DC side of power-converting device (27) through the second DC bus (29), and the AC of power-converting device (27) is electrically connected with the non-motor load of elevator (28); DC capacitor (26) is connected across the second DC bus (29) two ends; The anode of the first DC bus (6) is electrically connected with the anode of the second DC bus (29) through power switch (23), reactor (24), current probe (30);
On off controller (21) is connected with bus voltage detector (4), current probe (30), power switch (23) respectively by signal wire (SW);
Described charging-discharging controller (18) is controlled described charge-discharge circuit (19);
Described on off controller (21) is controlled the opening with shutoff of power switch (23) being arranged between the first DC bus (6) and the second DC bus (29), realize by this transmission of regenerated energy to the second DC bus (29), and then power to the non-motor load of elevator (28); The bus voltage V at the first DC bus (6) two ends that described energy consumption controller (16) detects according to bus voltage detector (4)
dcon-off element in energy consumption circuit (5) is opened and turn-offed control;
The bus voltage V of the first DC bus (6) that described charging-discharging controller (18) detects according to bus voltage detector (4)
dcand command value V
scdcrefto bus voltage V
dccarry out closed loop control;
The bus voltage V of the first DC bus (6) that described on off controller (21) detects according to bus voltage detector (4)
dcand command value V
dcrefto bus voltage V
dccarry out closed loop control;
The first DC bus-bar voltage command value V in described charging-discharging controller (18)
scdcrefand the first DC bus-bar voltage command value V on off controller (21)
dcrefmeet following relation:
V
dcrecmax<V
dcpre<V
dcref<V
scdcref<V
dcnhmin
Or V
dcrecmax<V
dcref<V
scdcref<V
dcnhmin;
Wherein, V
dcprethe pre-charge voltage at the first DC bus (6) two ends, V
dcrecmaxthe maximum vdc of rectifier (2) output, V
dcnhminthe voltage that quits work of energy consumption circuit (5).
2. the control method of energy saving system of elevator according to claim 1, is characterized in that, described energy consumption controller (16) to the control method of energy consumption circuit (5) is: as the bus voltage V at the first DC bus (6) two ends
dchigher than the trigger voltage V of energy consumption circuit (5)
dcnhmaxtime, start energy consumption circuit (5) by the on-off element of opening in energy consumption circuit (5); As the bus voltage V at the first DC bus (6) two ends
dclower than the voltage V that quits work of energy consumption circuit (5)
dcnhmintime, stop energy consumption circuit (5) by the on-off element disconnecting in energy consumption circuit (5).
3. the control method of energy saving system of elevator according to claim 1, is characterized in that, the control method of described charging-discharging controller (18) comprises the following steps:
Step 1, voltage control unit are according to the first DC bus-bar voltage command value V in charging-discharging controller
scdcrefthe bus voltage V of the first DC bus (6) detecting with bus voltage detector (4)
dcdirectly or further after current instruction value pretreatment unit amplitude limit and/or filtering, generate the primary current command value i of current control unit
scref0;
Step 2, by current instruction value amending unit to primary current command value i
scref0revise and obtain ultimate current command value i
scref;
Step 3, current control unit are according to ultimate current command value i
screfthe charging and discharging currents i of the closed-center system (20) detecting with closed-center system state detector (17)
scoutput control signal is controlled charge-discharge circuit (19).
4. the control method of energy saving system of elevator according to claim 3, is characterized in that, step 2 modification method is:
As SOC≤SOC
mintime,
If i
scref0>0, makes i
scref=0; If i
scref0≤ 0, make i
scref=i
scref0
Work as SOC
min≤ SOC≤SOC
maxtime, i
scref=i
scref0
As SOC>=SOC
maxtime,
If i
scref0≤ 0, make i
scref=0; If i
scref0>0, makes i
scref=i
scref0
Wherein: electric current flows to the first DC bus (6) for positive dirction by closed-center system (20).
5. the control method of energy saving system of elevator according to claim 1, is characterized in that, the control method of described on off controller (21) comprises the following steps:
Step 1, voltage control unit are according to the first DC bus-bar voltage command value V on off controller
dcrefthe bus voltage V of the first DC bus (6) detecting with bus voltage detector (4)
dcdirectly or after current instruction value pretreatment unit amplitude limit and/or filtering, generate the primary current command value i of current control unit
loadref0;
Step 2, current instruction value amending unit are to primary current command value i
loadref0revise and obtain ultimate current command value i
loadref;
Step 3, current control unit are according to ultimate current command value i
loadrefthe current i detecting with current probe (30)
loadoutput control signal is controlled power switch (23).
6. the control method of energy saving system of elevator according to claim 5, is characterized in that, the modification method of step 2 is: work as i
loadref0when >0, make i
loadref=0, work as i
loadref0≤ 0, make i
loadref=i
loadref0, wherein: electric current flows to the first DC bus (6) for positive dirction by the second DC bus (29).
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