CN109585215A - A kind of vacuum switch arc quenching system and method based on virtual voltage feedforward control - Google Patents
A kind of vacuum switch arc quenching system and method based on virtual voltage feedforward control Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
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Abstract
A kind of vacuum switch arc-suppressing method based on virtual voltage feedforward control, arc extinguishing is implemented to vacuum switch using grid-connected voltage source type inverter of the work under current source mode, the fast arc extinction of vacuum switch is realized by the inverter control algorithm for combining virtual voltage feedforward control with current follow-up control, the quenching time of vacuum switch can be greatly shortened, it is a kind of easy to operate, it is easy to accomplish, practical and widely used arc-suppressing method.
Description
(1) technical field:
The invention belongs to field of electrical equipment, it is related to controlling power grid parallel connection type three-phase by virtual voltage feed-forward control algorithm
Inverter realizes the fast arc extinction of vacuum switch, especially a kind of vacuum switch arc quenching system based on virtual voltage feedforward control
And method.
(2) background technique:
With the development of fast vacuum switching technique, the fast vacuum switch based on permanent magnet is got in power industry application
Come more extensive.The quick acting switching-off and rapid closing of switch can not only be substantially reduced electric power system fault range of scatter, Er Qieke
To realize the quick back brake of enterprise's double circuit power supply, high reliability power supply is provided for the process flow of operating condition enterprise.
Currently, the fast vacuum switch either based on spinning disk or the fast vacuum switch based on permanent magnet,
Phenomenon of arc discharge can all occur when switching separating brake, since arc light still has conductive characteristic, even if switching during arcing
Contact realizes physics disjunction, but there is no realize really insulation disjunction.Vacuum extinction cover is the important of current high-speed switch
Arc extinguishing device, but it can only realize complete arc extinguishing after current zero-crossing point, still can continue maximum so as to cause the quenching time
10ms。
In view of detection time, this 10ms quenching time be still to some voltage sensitivity loads it is intolerable,
If can further shorten the quenching time simultaneously can also reduce electric power system fault range.However at present by Switch main body
The development of vacuum extinction technology has arrived at bottleneck, therefore realizes that fast arc extinction is a kind of feasible by cooperating with other power equipments
Solution.
(3) summary of the invention:
The purpose of the present invention is to provide a kind of vacuum switch arc quenching system and method based on virtual voltage feedforward control,
It can make up the deficiencies in the prior art, using grid-connected voltage source type inverter of the work under current source mode to vacuum switch
Implement arc extinguishing to realize the fast arc extinction of vacuum switch by combining virtual voltage feedforward control with current follow-up control, be
A kind of structure is simple, method easy to implement the method.
Technical solution of the present invention: a kind of vacuum switch arc quenching system based on virtual voltage feedforward control, including it is controlled
Object LCL filter and controlled device DC capacitor, it is characterised in that it includes that outer voltage target value gives unit, ratio product
Divide algorithm unit, the generation of voltage angular frequency and computing unit and the virtual feedforward arithmetic unit of current tracking；Wherein, outside the voltage
Ring target value gives unit and acquires DC side voltage of converter instantaneous value signal, generates control target value；The proportional integration is calculated
The output end of output end and DC capacitor that the input terminal of method unit gives unit with outer voltage target value respectively is connect, defeated
Outlet is connect with the virtual feedforward arithmetic unit of current tracking；The voltage angular frequency generates and the input terminal of computing unit acquires system
The phase voltage instantaneous value of each phase of system power supply A, B, C three-phase, output end connect the virtual feedforward arithmetic unit of current tracking；Institute
The input terminal for stating the virtual feedforward arithmetic unit of current tracking is also connect with controlled device LCL filter, output end and controlled pair
As LCL filter is connected with controlled device DC capacitor.
The voltage angular frequency generates and computing unit is made of phase-locked loop module and sinusoidal signal generation module；It is described
Phase-locked loop module obtains real-time phase, output end and sinusoidal letter for detecting to the phase voltage instantaneous value of system power supply
The connection of number generation module；The output end of the sinusoidal signal generation module connects the virtual feedforward arithmetic unit of current tracking.
The phase-locked loop module is 3, is respectively used to instantaneous to the phase voltage of each phase of A, B, C three-phase of system power supply
The V of valuea、Vb、VcIt is detected, obtains the real-time phase of every phase phase voltage.
The sinusoidal signal generation module is 3, is respectively used to obtain the real-time phase of every phase phase voltage by phase-locked loop module
Position carries out the calculation processing of sinusoidal signal.
The virtual feedforward arithmetic unit of current tracking is 3, for realizing the current signal to system A, B, C three-phase
The feedforward control of tracking and virtual voltage, input terminal are connect with 3 sinusoidal signal generation modules respectively, and output end connects respectively
Connect A, B, C three-phase and DC capacitor of controlled device LCL filter.
A kind of vacuum switch arc-suppressing method based on virtual voltage feedforward control, which is characterized in that it the following steps are included:
(1) it is based on inverter direct-current voltage instantaneous value VdcOuter voltage control:
1-1 gives unit by outer voltage target value and acquires inverter direct-current voltage instantaneous value Vdc, and by inverter direct current
Side voltage controls target value VDCAs outer voltage target given value；
1-2 is by outer voltage target given value VDCWith inverter direct-current voltage instantaneous value VdcIt makes the difference, obtains deviation delta V；
The Δ V that above-mentioned steps obtain is carried out proportional integration operation in proportional integration algorithm unit and obtains outer voltage by 1-3
The controlling value V of PI controllerPI, it may be assumed that
Wherein KPFor proportionality coefficient, TIFor integral coefficient；
1-4 using voltage angular frequency generate and computing unit in phase-locked loop module to the every of system power supply A, B, C three-phase
The V of the phase voltage instantaneous value of one phasea、Vb、VcIt is detected, obtains the real-time phase ω of every phase phase voltageA, ωB, ωC, and by just
String signal generation module calculates gained real-time phase, seeks its sine value sin (ωA)、sin(ωB)、sin(ωC)；
The V that 1-5 obtains step 1-3PIRespectively with the sin (ω of step 1-4A)、sin(ωB)、sin(ωC) being multiplied obtains
Corresponding A, B, three current tracking inner loop target given value I of C three-phaseA、IB、IC；
1-6 is by current tracking inner loop target given value IA、IB、ICWith inverter three-phase alternating current output current instantaneous value Ia、Ib、
IcIt makes the difference, respectively obtains deviation delta Ia、ΔIb、ΔIc, defeated respectively as three of the virtual feed-forward control algorithm unit of current tracking
Enter signal；
(2) current tracking inner ring and virtual voltage feedforward control are realized by the virtual feed-forward control algorithm unit of current tracking:
The Δ I that 2-1 will be obtained by step 1-6a、ΔIb、ΔIcRespectively carry out proportional integration operation, respectively obtain electric current with
The controlling value of track inner ring PI controller, is denoted as IPIa、IPIb、IPIc, it may be assumed that
Wherein KPFor proportionality coefficient, TIFor integral coefficient；
2-2 is by sine value sin (ω obtained in step 1-4A)、sin(ωB)、sin(ωC), respectively with system power supply volume
The V of phasing voltage peak valueAm、VBm、VCmIt is multiplied, and using obtained voltage as the virtual voltage of system power supply, is denoted as: VAmsin
(ωA)、VBmsin(ωB)、VCmsin(ωC)；
2-3 is by the instantaneous value V of three-phase phase voltagea、Vb、VcMultiplied by coefficient k 1, by V obtained in step 2-2Amsin(ωA),
VBmsin(ωB), VCmsin(ωC) multiplied by coefficient k 2, two parts are separately summed, and obtain virtual feed-forward voltage, it may be assumed that
VAF=k1 × VA+k2×VAmsin(ωA)
VBF=k1 × VB+k2×VBmsin(ωB)
VCF=k1 × VC+k2×VCmsin(ωC)
Wherein: k1+k2=1；
2-4 is by V obtained in step 2-3AF, VBF, VCFWith I obtained in step 2-1PIa, IPIb, IPIcIt is added, can be obtained
Modulating wave m required for the final controlling value of arc extinguishing algorithm, i.e. inverter three-phase exportA、mB、mC, it is denoted as:
mA=(VAF+IPIa), mB=(VBF+IPIb), mC=(VCF+IPIc)；
(3) the modulating wave m that step (2) obtainsA、mB、mCAfter carrier modulation, pulsewidth modulation trigger signal PWM is generatedA、
PWMB、PWMCIt is respectively acting on the corresponding each phase bridge arm of inverter three, at this point, each phase bridge arm of inverter distinguishes output pulse width
Modulation voltage VPWMA、VPWMB、VPWMC, which will be with network voltage Va、Vb、VcCollective effect is in each of A, B, C three-phase respectively
Inverter is generated in the controlled device LCL filter of phase respectively mutually exports alternating current Ia、Ib、Ic；
(4) alternating current that regulating step (3) obtains may be implemented to inverter DC capacitor charge and discharge control, Jin Ershi
Show to DC voltage VdcControl.
The V obtained when virtual voltage feedovers in the step 2-2Amsin(ωA)、VBmsin(ωB)、VCmsin(ωC) it is root
According to obtained by system voltage phase calculation, the influence of system power source voltage transient state distortion not will receive, it can be by setting coefficient k 1
Achieve the purpose that make inverter ac output that there is voltage source characteristic with the relationship of k2；Since the electric arc generated when switch has resistance
Feel characteristic, the electric current for flowing through electric arc can generate the voltage of transient state on electric arc, therefore can be by with voltage source characteristic inversion
The voltage source clamping action of device quickly absorbs arc energy, finally realizes arc-suppression function.
Superiority of the invention: the arc-suppressing method based on virtual voltage feedforward control not only may insure in system power supply electricity
Pressure temporarily become when inverter will not overcurrent, can also realize fast arc extinction when vacuum switch separating brake, greatly shorten switch separating brake
Insulation break, realize the real quick break function of switch；It is easy to operate, easy to accomplish, practical and use
Occasion is wide.
(4) Detailed description of the invention:
Fig. 1 is a kind of implementing circuit knot of the vacuum switch arc-suppressing method based on virtual voltage feedforward control involved by the present invention
Structure schematic diagram.
Fig. 2 be outer voltage in a kind of vacuum switch arc-suppressing method based on virtual voltage feedforward control involved by the present invention,
The control principle flow diagram of current tracking inner ring and virtual voltage feedforward control.
Fig. 3 is in current tracking in a kind of vacuum switch arc-suppressing method based on virtual voltage feedforward control involved by the present invention
(wherein Fig. 3-a is the control principle drawing of A phase, and Fig. 3-b is B phase for ring and the specific control principle drawing of virtual voltage feedforward control
Control principle drawing, Fig. 3-c are the control principle drawing of C phase).
(5) specific embodiment:
Embodiment: a kind of vacuum switch arc quenching system based on virtual voltage feedforward control, as shown in Fig. 2, including controlled
Object LCL filter and controlled device DC capacitor, it is characterised in that it includes that outer voltage target value gives unit, ratio product
Divide algorithm unit, the generation of voltage angular frequency and computing unit and the virtual feedforward arithmetic unit of current tracking；Wherein, outside the voltage
Ring target value gives unit and acquires DC side voltage of converter instantaneous value signal, generates control target value；The proportional integration is calculated
The output end of output end and DC capacitor that the input terminal of method unit gives unit with outer voltage target value respectively is connect, defeated
Outlet is connect with the virtual feedforward arithmetic unit of current tracking；The voltage angular frequency generates and the input terminal of computing unit acquires system
The phase voltage instantaneous value of each phase of system power supply A, B, C three-phase, output end connect the virtual feedforward arithmetic unit of current tracking；Institute
The input terminal for stating the virtual feedforward arithmetic unit of current tracking is also connect with controlled device LCL filter, output end and controlled pair
As LCL filter is connected with controlled device DC capacitor.
The voltage angular frequency generates and computing unit is made of phase-locked loop module and sinusoidal signal generation module, such as schemes
Shown in 2；The phase-locked loop module obtains real-time phase, exports for detecting to the phase voltage instantaneous value of system power supply
End is connect with sinusoidal signal generation module；The output end of the sinusoidal signal generation module connects the virtual feedforward arithmetic of current tracking
Unit.
As shown in Fig. 2, the phase-locked loop module is 3, it is respectively used to each phase of A, B, C three-phase of system power supply
The V of phase voltage instantaneous valuea、Vb、VcIt is detected, obtains the real-time phase of every phase phase voltage.
As shown in Fig. 2, the sinusoidal signal generation module is 3, it is respectively used to obtain every Xiang Xiang electricity by phase-locked loop module
The real-time phase of pressure carries out the calculation processing of sinusoidal signal.
As shown in Fig. 2, the virtual feedforward arithmetic unit of current tracking is 3, for realizing to system A, B, C three-phase
The tracking of current signal and the feedforward control of virtual voltage, input terminal is connect with 3 sinusoidal signal generation modules respectively, defeated
Outlet is separately connected A, B, C three-phase and DC capacitor of controlled device LCL filter.
A kind of vacuum switch arc-suppressing method based on virtual voltage feedforward control, as shown in Figure 2, which is characterized in that it is wrapped
Include following steps:
(1) it is based on inverter direct-current voltage instantaneous value VdcOuter voltage control:
1-1 gives unit by outer voltage target value and acquires inverter direct-current voltage instantaneous value Vdc, and by inverter direct current
Side voltage controls target value VDCAs outer voltage target given value；
1-2 is by outer voltage target given value VDCWith inverter direct-current voltage instantaneous value VdcIt makes the difference, obtains deviation delta V；
The Δ V that above-mentioned steps obtain is carried out proportional integration operation in proportional integration algorithm unit and obtains outer voltage by 1-3
The controlling value V of PI controllerPI, it may be assumed that
Wherein KPFor proportionality coefficient, TIFor integral coefficient；
1-4 using voltage angular frequency generate and computing unit in phase-locked loop module to the every of system power supply A, B, C three-phase
The V of the phase voltage instantaneous value of one phasea、Vb、VcIt is detected, obtains the real-time phase ω of every phase phase voltageA, ωB, ωC, and by just
String signal generation module calculates gained real-time phase, seeks its sine value sin (ωA)、sin(ωB)、sin(ωC)；
The V that 1-5 obtains step 1-3PIRespectively with the sin (ω of step 1-4A)、sin(ωB)、sin(ωC) being multiplied obtains
Corresponding A, B, three current tracking inner loop target given value I of C three-phaseA、IB、IC；
1-6 is by current tracking inner loop target given value IA、IB、ICWith inverter three-phase alternating current output current instantaneous value Ia、Ib、
IcIt makes the difference, respectively obtains deviation delta Ia、ΔIb、ΔIc, defeated respectively as three of the virtual feed-forward control algorithm unit of current tracking
Enter signal；
(2) current tracking inner ring and virtual voltage feedforward control are realized by the virtual feed-forward control algorithm unit of current tracking:
The Δ I that 2-1 will be obtained by step 1-6a、ΔIb、ΔIcRespectively carry out proportional integration operation, respectively obtain electric current with
The controlling value of track inner ring PI controller, is denoted as IPIa、IPIb、IPIc, it may be assumed that
Wherein KPFor proportionality coefficient, TIFor integral coefficient；
2-2 is by sine value sin (ω obtained in step 1-4A)、sin(ωB)、sin(ωC), respectively with system power supply volume
The V of phasing voltage peak valueAm、VBm、VCmIt is multiplied, and using obtained voltage as the virtual voltage of system power supply, is denoted as: VAmsin
(ωA)、VBmsin(ωB)、VCmsin(ωC)；
2-3 is by the instantaneous value V of three-phase phase voltagea、Vb、VcMultiplied by coefficient k 1, by V obtained in step 2-2Amsin(ωA),
VBmsin(ωB), VCmsin(ωC) multiplied by coefficient k 2, two parts are separately summed, and obtain virtual feed-forward voltage, it may be assumed that
VAF=k1 × VA+k2×VAmsin(ωA)
VBF=k1 × VB+k2×VBmsin(ωB)
VCF=k1 × VC+k2×VCmsin(ωC)
Wherein: k1+k2=1；
2-4 is by V obtained in step 2-3AF, VBF, VCFWith I obtained in step 2-1PIa, IPIb, IPIcIt is added, can be obtained
Modulating wave m required for the final controlling value of arc extinguishing algorithm, i.e. inverter three-phase exportA、mB、mC, it is denoted as:
mA=(VAF+IPIa), mB=(VBF+IPIb), mC=(VCF+IPIc)；
(3) the modulating wave m that step (2) obtainsA、mB、mCAfter carrier modulation, pulsewidth modulation trigger signal PWM is generatedA、
PWMB、PWMCIt is respectively acting on the corresponding each phase bridge arm of inverter three, at this point, each phase bridge arm of inverter distinguishes output pulse width
Modulation voltage VPWMA、VPWMB、VPWMC, which will be with network voltage Va、Vb、VcCollective effect is in each of A, B, C three-phase respectively
Inverter is generated in the controlled device LCL filter of phase respectively mutually exports alternating current Ia、Ib、Ic；
(4) alternating current that regulating step (3) obtains may be implemented to inverter DC capacitor charge and discharge control, Jin Ershi
Show to DC voltage VdcControl.
The V obtained when virtual voltage feedovers in the step 2-2Amsin(ωA)、VBmsin(ωB)、VCmsin(ωC) it is root
According to obtained by system voltage phase calculation, the influence of system power source voltage transient state distortion not will receive, it can be by setting coefficient k 1
Achieve the purpose that make inverter ac output that there is voltage source characteristic with the relationship of k2；Since the electric arc generated when switch has resistance
Feel characteristic, the electric current for flowing through electric arc can generate the voltage of transient state on electric arc, therefore can be by with voltage source characteristic inversion
The voltage source clamping action of device quickly absorbs arc energy, finally realizes arc-suppression function.
Below in conjunction with attached drawing, a kind of vacuum switch arc-suppressing method based on virtual voltage feedforward control of the present invention is discussed in detail
Working principle and the course of work:
As shown in Figure 1 for based on inverter, LCL filter, DC capacitor, the circuit theory of vacuum switch and controller
Figure, inverter are conventional three-phase inverter, and inverter exports three-phase current Ia,Ib, IcIt is filtered by each phase LCL filter to LCL
The system power supply of wave device parallel connection, controller pass through acquisition inverter DC capacitor voltage Vdc, inverter output three-phase current Ia,
Ib, Ic, system power source voltage Va, Vb, VcRealize control strategy, controller output pwm signal to execution unit, i.e. inverter are real
Opening for existing each corresponding IGBT (insulated gate transistor) of inverter is controlled with shutdown, and execution unit acts on controlled device,
That is DC capacitor and each phase LCL filter realize the control of outer voltage and current tracking inner ring, by current tracking inner ring
The voltage source strength that virtual voltage feedforward control adjusts inverter is added, finally to realize the arc-suppression function to vacuum switch.
Fig. 2 is based on outer voltage, current tracking inner ring and virtual feedforward control schematic diagram, and outer voltage is realized to direct current
Capacitance voltage VdcControl, principle are by adjusting inverter ac electric current Ia,Ib, IcIt is real to the charge and discharge of DC capacitor
Existing DC voltage control, therefore outer voltage control output IA,IB, ICFor the input target value of current inner loop, due to for three contraries
Become device, each phase independent control, therefore there are three current tracking inner ring as shown in Figure 2, respectively correspond A, B, C three-phase, current inner loop
Controller exports IPIa, IPIb, IPIc, by directly realizing voltage feedforward control algorithm to its superimposed voltage value, it is common practice that straight
Meet overlapping system power supply instantaneous value Va, Vb, Vc, can be inverter output voltage system for tracking supply voltage in this way, avoid when being
There is occurring after voltage transient variation inverter overcurrent and stops working phenomenon in system power supply, but when vacuum switch is in separating brake, electric arc meeting
Fatal voltage is caused temporarily to become, the voltage transient variation is different from voltage transient variation caused by system power supply, and energy is very weak, at this time if inversion
Device, which can have voltage source characteristic, can quickly absorb the arc energy, so that it is guaranteed that the fast arc extinction of vacuum switch.
Voltage feedforward control algorithm of the invention is pushed away according to system power source voltage rated peak and real-time phase computation first
Virtual voltage V outAmsin(ωA), VBmsin(ωB), VCmsin(ωC), i.e., the voltage is desired value, is not true value, multiplied by one
After coefficient again respectively with system power supply instantaneous value Va, Vb, VCV is added to obtain multiplied by a coefficient valueAF, VBF, VCF, by its respectively with electric current
Inner loop control device exports IPIa, IPIb, IPIcAddition obtains final modulating wave mA,mB,mC, in this way in vacuum switch disconnection process,
Since inverter maintains voltage source characteristic, fast arc extinction not only may be implemented, and may be implemented inverter from current source without
Voltage source function is changed in seaming and cutting, provides guarantee for voltage-sensitive load power supply reliability.
Claims (9)
1. a kind of vacuum switch arc quenching system based on virtual voltage feedforward control, including controlled device LCL filter and controlled
Object DC capacitor, it is characterised in that it includes that outer voltage target value gives unit, proportional integration algorithm unit, voltage angular frequency
Rate generation and computing unit and the virtual feedforward arithmetic unit of current tracking；Wherein, the outer voltage target value gives unit and adopts
Collect DC side voltage of converter instantaneous value signal, generates control target value；The input terminal of the proportional integration algorithm unit is distinguished
It is connect with the output end of the output end of the given unit of outer voltage target value and DC capacitor, output end is virtual with current tracking
The connection of feedforward arithmetic unit；Input terminal acquisition system power supply A, B, C three-phase of the voltage angular frequency generation and computing unit
The phase voltage instantaneous value of each phase, output end connect the virtual feedforward arithmetic unit of current tracking；Before the current tracking is virtual
The input terminal of feedback algorithm unit also connect with controlled device LCL filter, output end and controlled device LCL filter and is controlled
The connection of object DC capacitor.
2. a kind of vacuum switch arc quenching system based on virtual voltage feedforward control according to claim 1, it is characterised in that
The voltage angular frequency generates and computing unit is made of phase-locked loop module and sinusoidal signal generation module；The locking phase ring moulds
Block obtains real-time phase, output end and sinusoidal signal generate mould for detecting to the phase voltage instantaneous value of system power supply
Block connection；The output end of the sinusoidal signal generation module connects the virtual feedforward arithmetic unit of current tracking.
3. a kind of vacuum switch arc quenching system based on virtual voltage feedforward control according to claim 2, it is characterised in that
The phase-locked loop module is 3, is respectively used to the V of the phase voltage instantaneous value of each phase to A, B, C three-phase of system power supplya、
Vb、VcIt is detected, obtains the real-time phase of every phase phase voltage.
4. a kind of vacuum switch arc quenching system based on virtual voltage feedforward control according to claim 2, it is characterised in that
The sinusoidal signal generation module is 3, and the real-time phase for being respectively used to be obtained every phase phase voltage by phase-locked loop module carries out just
The calculation processing of string signal.
5. a kind of vacuum switch arc quenching system based on virtual voltage feedforward control according to claim 1, it is characterised in that
The virtual feedforward arithmetic unit of current tracking is 3, for realizing the tracking and void of the current signal to system A, B, C three-phase
The feedforward control of quasi- voltage, input terminal are connect with 3 sinusoidal signal generation modules respectively, and output end is separately connected controlled pair
As A, B, C three-phase and DC capacitor of LCL filter.
6. a kind of vacuum switch arc-suppressing method based on virtual voltage feedforward control, which is characterized in that it the following steps are included:
(1) unit is given by outer voltage target value and acquires inverter direct-current voltage instantaneous value Vdc, set outer voltage target and give
Definite value, for realizing inverter direct-current voltage instantaneous value V is based ondcOuter voltage control；
(2) current tracking inner ring and virtual voltage feedforward control are realized by the virtual feed-forward control algorithm unit of current tracking, obtained
A, the modulation wave signal of B, C three-phase；
(3) modulation wave signal that step (2) obtains generates pulsewidth modulation trigger signal PWM after carrier modulationA、PWMB、
PWMCIt is respectively acting on the corresponding each phase bridge arm of inverter three, at this point, each phase bridge arm difference output pulse width modulation of inverter
Voltage VPWMA、VPWMB、VPWMC, which will be with network voltage Va、Vb、VcEach phase of the collective effect in A, B, C three-phase respectively
Inverter is generated in controlled device LCL filter respectively mutually exports alternating current Ia、Ib、Ic；
(4) alternating current that regulating step (3) obtains may be implemented to inverter DC capacitor charge and discharge control, and then realize
To DC voltage VdcControl.
7. a kind of vacuum switch arc-suppressing method based on virtual voltage feedforward control according to claim 6, it is characterised in that
The step (1) is specifically to be made of following steps:
1-1 gives unit by outer voltage target value and acquires inverter direct-current voltage instantaneous value Vdc, and inverter direct-flow side is electric
Voltage-controlled target value V processedDCAs outer voltage target given value；
1-2 is by outer voltage target given value VDCWith inverter direct-current voltage instantaneous value VdcIt makes the difference, obtains deviation delta V；
The Δ V that above-mentioned steps obtain is carried out proportional integration operation in proportional integration algorithm unit and obtains outer voltage PI control by 1-3
The controlling value V of device processedPI, it may be assumed that
Wherein KPFor proportionality coefficient, TIFor integral coefficient；
1-4 using voltage angular frequency generate and computing unit in phase-locked loop module to each phase of system power supply A, B, C three-phase
Phase voltage instantaneous value Va、Vb、VcIt is detected, obtains the real-time phase ω of every phase phase voltageA, ωB, ωC, and believed by sine
Number generation module calculates gained real-time phase, seeks its sine value sin (ωA)、sin(ωB)、sin(ωC)；
The V that 1-5 obtains step 1-3PIRespectively with the sin (ω of step 1-4A)、sin(ωB)、sin(ωC) being multiplied is corresponded to
Three current tracking inner loop target given value I of A, B, C three-phaseA、IB、IC；
1-6 is by current tracking inner loop target given value IA、IB、ICWith inverter three-phase alternating current output current instantaneous value Ia、Ib、IcIt does
Difference respectively obtains deviation delta Ia、ΔIb、ΔIc, respectively as three inputs letter of the virtual feed-forward control algorithm unit of current tracking
Number.
8. a kind of vacuum switch arc-suppressing method based on virtual voltage feedforward control according to claim 6, it is characterised in that
The step (2) is specifically to be made of following steps:
The Δ I that 2-1 will be obtained by step 1-6a、ΔIb、ΔIcProportional integration operation is carried out respectively, is respectively obtained in current tracking
The controlling value of ring PI controller, is denoted as IPIa、IPIb、IPIc, it may be assumed that
Wherein KPFor proportionality coefficient, TIFor integral coefficient；
2-2 is by sine value sin (ω obtained in step 1-4A)、sin(ωB)、sim(ωC), respectively with the specified phase of system power supply
The V of voltage peakAm、VBm、VCmIt is multiplied, and using obtained voltage as the virtual voltage of system power supply, is denoted as: VAmsin(ωA)、
VBmsin(ωB)、VCmsin(ωC)；
2-3 is by the instantaneous value V of three-phase phase voltagea、Vb、VcMultiplied by coefficient k 1, by V obtained in step 2-2Amsin(ωA),
VBmsin(ωB), VCmsin(ωC) multiplied by coefficient k 2, two parts are separately summed, and obtain virtual feed-forward voltage, it may be assumed that
VAF=k1 × VA+k2×VAmsin(ωA)
VBF=k1 × VB+k2×VBmsin(ωB)
VCF=k1 × VC+k2×VCmsin(ωC)
Wherein: k1+k2=1；
2-4 is by V obtained in step 2-3AF, VBF, VCFWith I obtained in step 2-1PIa, IPIb, IPIcIt is added, arc extinguishing can be obtained
Modulating wave m required for the final controlling value of algorithm, i.e. inverter three-phase exportA、mB、mC, it is denoted as:
mA=(VAF+IPIa), mB=(VBF+IPIb), mc=(VCF+IPIc)。
9. a kind of vacuum switch arc-suppressing method based on virtual voltage feedforward control according to claim 8, it is characterised in that
The V obtained when virtual voltage feedovers in the step 2-2Amsin(ωA)、VBmsin(ωB)、VCmsin(ωC) it is according to system electricity
The influence that not will receive the distortion of system power source voltage transient state obtained by phase calculation is pressed, the pass of setting coefficient k 1 and k2 can be passed through
System achievees the purpose that inverter ac output is made to have voltage source characteristic；Since the electric arc generated when switch has resistance sense characteristic,
The electric current for flowing through electric arc can generate the voltage of transient state on electric arc, therefore can pass through the voltage with voltage source characteristic inverter
Source clamping action quickly absorbs arc energy, finally realizes arc-suppression function.
Priority Applications (1)
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