CN103001527B - The three-phase four-leg inverter circulation inhibition method in parallel of injecting based on triple-frequency harmonics - Google Patents
The three-phase four-leg inverter circulation inhibition method in parallel of injecting based on triple-frequency harmonics Download PDFInfo
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Abstract
A kind of three-phase four-leg inverter injecting based on triple-frequency harmonics circulation inhibitory control in parallel strategy. The method is on the basis of three-phase three-leg inverter shunt voltage double current loop modulation (1); for two three-phase four-leg inverter modules (2) (3) topology in parallel; by synthetic the three-phase current reference signal of Voltage loop output zero-sequence current reference signal (4); make each module the 4th brachium pontis center line inductive current follow the tracks of zero-sequence current reference signal through error amplifier; realize the current-sharing of two three-phase four-leg inverter currents in middle wire, reach the object that suppresses current in middle wire circulating current protection power tube raising transducer effciency. Two harmonic signal (5) synthetic two blocks current ring output signals are added to (6) simultaneously and average (7) as the public harmonic signal (8) being injected in two inverter module three-phases and center line modulation signal, eliminate the zero sequence modulation product in harmonic signal, suppress the factors such as, switching tube inconsistent by main circuit filter parameter switch time is inconsistent, the instantaneous zero sequence circulation of generation. The method has advantages of several outstanding: 1) effectively suppressed current in middle wire circulation; 2) control loop is simple; 3) triple-frequency harmonics that does not affect shunt chopper injects, and has improved DC voltage utilization rate.
Description
Technical field:
What the present invention relates to is a kind of three-phase four-leg inverter injecting based on triple-frequency harmonics circulation inhibition method in parallel,Belong to the control technology in electrical energy changer.
Background technology:
In new forms of energy, aircraft and electric automobile distributed electricity generation system, adopt the three-phase four-arm of SPWM control at presentInverter is widely used with advantages such as its three-phase decoupling zero, band asymmetric load ability, short circuit current limitations. Along with power electronicsImproving constantly of plant capacity grade, inverter parallel technology, by stacking multiple inversion modules, provides electric energy to load jointly, becomesFor inverter dilatation and reduction switching tube current stress are preferentially selected.
Because inverter parallel is different from the parallel connection of traditional straight convertor, when many inverter common DC bus carry outWhen dilatation is in parallel, require the amplitude of every inverter module output consistent with phase place, prevent the circulation between module. Circulation will be ledCause the imbalance of power between modules, increase extra loss, serious time, even can damage the device in main circuit.Triple-frequency harmonics is injected with to be beneficial to and improves DC voltage utilization rate simultaneously, reduces inverter input direct-current busbar voltage grade, improvesOutput waveform quality. In reality, the main circuit parameter of modules can not be consistent with main power tube switch time etc., thisThe asymmetric aggravation that certainly will cause circulation problem of triple-frequency harmonics that a little factors cause. Therefore be necessary very much that research is a kind of based on threeThe three-phase four-leg inverter circulation inhibitory control in parallel strategy that subharmonic injects.
Summary of the invention:
The present invention is intended to propose a kind of three-phase four-leg inverter circulation in parallel inhibition side that triple-frequency harmonics injects that is applicable toMethod.
To achieve these goals, the technical solution used in the present invention is, traditional based on three of Average Current ControlOn the basis of three brachium pontis current sharing control strategies, three-phase current reference signal is added and obtains center line zero-sequence current benchmark mutually,Each parallel module center line inductive current regulates tracking center line zero-sequence current benchmark to obtain the 4th brachium pontis modulation signal through PI, shouldModulation signal and carrier wave are handed over to cut and are produced SPWM switching signal control the 4th brachium pontis switching tube. Realize multiple modules the 4th brachium pontis in parallelThe object of inductive current current-sharing.
In conventional inverter control strategy, improve DC voltage utilization rate by triple-frequency harmonics method for implanting. The present invention adoptsIf with control strategy in note as triple-frequency harmonics by the synthetic triple-frequency harmonics of each module self electric current loop output modulation signalFashionable, because the reason such as asymmetric of main circuit circuit parameter between each module and main power tube switch time will generation moduleBetween generate the asymmetric problem of triple-frequency harmonics. When harmonic signal is injected into this module brachium pontis modulation signal, will be in parallel connectionBetween module, produce zero sequence circulation. The present invention on the basis of above-mentioned triple-frequency harmonics injecting strategy by the triple-frequency harmonics of modulesSignal plus is averaged as the shared harmonic signal of all inversion modules, each brachium pontis of this signal and each moduleModulation signal is added, and the modulation signal of generation and carrier wave are handed over to cut and produced SPWM switching signal. The method has been eliminated zero sequence circulation and has been dividedMeasure, realize the power-balance of inversion module.
Brief description of the drawings:
Fig. 1 is the circulation inhibition method control strategy knot that three-phase four-leg inverter of the present invention triple-frequency harmonics in parallel injectsStructure schematic diagram. Label title in accompanying drawing 1: (1)---three-phase sharing control unit; (2)---three-phase four-leg inverter mouldPiece 1; (3)---three-phase four-leg inverter module 2; (4)---current in middle wire reference signal generation unit; (5) inversion module 1Triple-frequency harmonics generation unit; (6) inversion module 2 triple-frequency harmonics generation units; (7) without the harmonic signal of zero sequence Circulation ComponentsGeneration unit; (8) harmonic signal.
Fig. 2 is the inhibition main waveform schematic diagram of the present invention for center line inductive current circulation.
Fig. 3 is the main waveform signal of zero sequence circulation effect between module while not adopting in the present invention zero sequence circulation inhibition methodFigure.
Fig. 4 is zero sequence circulation between threephase load poised state lower module while adopting in the present invention zero sequence circulation inhibition methodThe main waveform schematic diagram of inhibition.
Fig. 5 be while adopting in the present invention the zero sequence circulation method of inhibitioning between three-phase imbalance state lower module zero sequence circulation butThe main waveform schematic diagram of effect processed.
Main designation in accompanying drawing 1:
Vin---input direct voltage, C1, C2---input filter capacitor, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8---Inversion module 1 main power tube switching signal, LA1、LB1、LC1,---module 1 three-phase filter inductance, ILA1、ILB1、ILC1、——Module one three-phase filter inductance electric current, LN1---module 1 center line inductance, ILN1---module 1 center line inductive current, Q9, Q10,The each brachium pontis main power tube of Q11, Q12, Q13, Q14, Q15, Q16---inversion module 2 switching signal, LA2、LB2、LC2,---module2 three-phase filter inductances, ILA2、ILB2、ILC2,---module one three-phase filter inductance electric current, LN2---module 1 center line inductance,ILN2---module 1 center line inductive current, CA、CB、CC---three-phase output filter capacitor, RA、RB、RC---threephase load, VA、VB、VC---three-phase output voltage, Varef、Vbref、Vcref---three-phase output voltage reference signal, Ta1、Tb1、Tc1---module 1Three-phase current ring output error signal, Ta2、Tb2、Tc2---module 2 three-phase current ring output error signals, Inref---center lineCurrent reference signal, TFH---harmonic signal.
Detailed description of the invention:
Accompanying drawing 1 is that the three-phase four-leg inverter circulation inhibition method in parallel control strategy structure of injecting with triple-frequency harmonics is shownIntention, its control circuit part is mainly by three pole reactor electric current equalizing controller (1), current in middle wire reference signal formation controller(4), triple-frequency harmonics maker (5) (6) (7), several major part composition. Wherein three pole reactor electric current equalizing controller first byThree-phase output voltage and the reference voltage comparison of feedback, obtain three-phase current through the proportional integral link of operational amplifier compositionThe current reference signal of ring, then sample the value of feedback that obtains each inversion module three pole reactor electric current with shared by LEMCurrent reference signal compares, and obtains each first three brachium pontis of module three-phase through the proportional integral link of operational amplifier compositionModulation signal, this modulation signal and carrier wave knot are through SPWM modulation and then obtain opening of first three brachium pontis main power tube of three-phaseClose signal.
Shared three pole reactor current reference signal is added, obtains the zero-sequence current reference signal of three-phase three brachium pontis, doFor the reference signal of each inversion module the 4th brachium pontis center line inductive current. Each module center line inductive current through LEM sampling withZero-sequence current reference signal compares through proportional integral link and obtains modulation signal and carrier wave knot obtains each inversion moduleThe 4th brachium pontis main power tube SPWM switching signal.
By each module three-phase current ring output error signal Ta1、Tb1、Tc1And Ta2、Tb2、Tc2Synthetic this module that obtains respectivelyHarmonic signal, then each harmonic signal is added and is averaged, the harmonic signal mean value obtaining is foldedBe added to and in the modulation signal of each inversion module three-phase brachium pontis and center line the 4th brachium pontis, realize triple-frequency harmonics and inject. Tune after syntheticSignal processed and carrier wave are handed over the switch that intercepts SPWM switching signal control main power tube.
Operation principle:
Below with reference to the accompanying drawings 1, narrate specific works principle of the present invention, corresponding circuit key waveforms is shown in accompanying drawing 2-accompanying drawing5.
Dicyclo sharing control side for the three-phase three-leg inverter in parallel of common DC bus based on Average Current ControlFormula is conventional control strategy. If by three-phase four-leg inverter parallel connection, the 4th brachium pontis also can be deposited with three brachium pontis are the same aboveAt circulation problem. The parameter unbalance of switching tube is to cause chief reason of this circulation problem. Suppose in accompanying drawing 1 Q7 withThere is the state of conducting simultaneously in Q16, supposes that this state is state A, and Q8 and Q15 also exist the state of conducting simultaneously, establish this shapeState is state B. If the cycle in state A in N switch periods will be more than the cycle of state B, so N switch weekThe IL that after phase, the imbalance of period of state causesN1And ILN2Rate of change difference will produce the unbalanced shape of current in middle wireState, even exceedes the permissible value of main power tube, damages main circuit. This overcurrent process is by the current in middle wire circulation ripple in accompanying drawing 2Shape can be embodied.
The present invention provides the operation principle of three-phase zero-sequence current path, wink with reference to three-phase four-leg inverter the 4th brachium pontisTime zero-sequence current be instantaneous three-phase three brachium pontis inductive current sums. Therefore in order to realize three-phase four-leg inverter in parallel the 4th bridgeThe current-sharing of arm current in middle wire, can adopt three-phase current circular current reference signal sum as the 4th brachium pontis zero-sequence current reference signalGenerate. Obtain modulation signal by feeding back the 4th brachium pontis inductive current and zero-sequence current reference signal through proportional integral linkRealize the 4th brachium pontis current-sharing.
In order to improve DC voltage utilization rate, optimize output waveform, need in three-phase four-leg inverter in parallel, superposeHarmonic signal. Set up the electric current loop error signal model of module 1:
da1＝(iaref-ia1)Gi
db1＝(ibref-ib1)Gi
dc1＝(icref-ic1)Gi
D in above formulan1For the electric current loop output error signal of each phase of electric current loop, dnrefFor every phase current cyclic group calibration signal,in1For every phase inductance current feedback signal, GiFor electric current loop transfer function. In like manner can obtain the electric current loop error signal of module 2Model:
da2＝(iaref-ia2)Gi
db2＝(ibref-ib2)Gi
dc2＝(icref-ic2)Gi
In the time that two modules meet the uneven conditions of state such as wave filter imbalance, switch time be asymmetric, adopt common voltageRing current-sharing, but can there is error in inductor current feedback value. Mutually as example, suppose that two module inductive current mean values are i taking Aa, mouldPiece one inductive current ia1＝ia+Δia, module two inductive current ia2＝ia-Δia, and can this be extrapolated to B phase and C phase. ThoughSo the margin of error can be modulated and be kept balance to realize current-sharing by pi regulator, but in the time adopting triple-frequency harmonics to inject, three timesHarmonic wave is the instantaneous imbalance by the uneven output causing of pi regulator input. Suppose that triple-frequency harmonics generates transfer function and isGs, the triple-frequency harmonics of module one, module two is respectively:
S1＝(da1+db1+dc1)×Gs
＝[(iaref-ia)+(ibref-ib)+(icref-ic)]×Gi×Gs+(Δia+Δiv+Δic)×Gi×Gs
S2＝(da2+db2+dc2)×Gs
＝[(iaref-ia)+(ibref-ib)+(icref-ic)]×Gi×Gs-(Δia+Δib+Δic)×Gi×Gs
Can be found out by two formulas above, all there is (Δ an i in two modulesa+Δib+Δic)×Gi×GsNot controlled zeroOrder component, if be added to three-phase current ring output error signal and the 4th brachium pontis, this not controlled amount is equivalent to the tune in moduleThe zero-sequence component that superposeed in signal processed and then produce zero sequence circulation problem, improves the ring of two module homophase inductive currents greatlyStream. Can not reduce because of alleviating of load according to this zero sequence Circulation Components of modeling result simultaneously. In the time that reducing, load can make electricityInducing current produces significantly distortion. This zero sequence circulation problem has clear and definite embodiment in the oscillogram of accompanying drawing 3.
According to derivation result, zero-sequence component is to be caused by zero sequence composition not controlled in the triple-frequency harmonics superposeing, according toFormula, the zero-sequence component amplitude equal phase of two modules is contrary.
S1＝(da1+db1+dc1)×Gs
＝[(iaref-ia)+(ibref-ib)+(icref-ic)]×Gi×Gs+(Δia+Δib+Δic)×Gi×Gs
S2＝(da2+db2+dc2)×Gs
＝[(iaref-ia)+(ibref-ib)+(icref-ic)]×Gi×Gs-(Δia+Δib+Δic)×Gi×Gs
If the zero sequence composition in the third-harmonic component of two modules is eliminated, can be solved zero sequence circulation problem. ThisControl strategy in invention is exactly after triple-frequency harmonics stack, to average and to obtain new harmonic signal.
The injection mode of this signal in control circuit with before identical. Control strategy result embodies the load of accompanying drawing 4In the oscillogram of poised state, embody this control strategy by accompanying drawing 5 simultaneously and can not affect three-phase four-leg inverter in parallelWith the ability of unbalanced load. This and modeling result match.
Claims (1)
1. the three-phase four-leg inverter injecting based on a triple-frequency harmonics circulation inhibition method in parallel,
Main circuit topology adopts two cover three-phase four-leg inverters to input altogether and be total to the connected mode of output, it is characterized in that adoptingDouble closed-loop of voltage and current, three-phase electricity pressure ring produces two three-phase current reference signal I that inverter module is publicaref、IbrefAnd Icref, the three-phase current of each module is followed the tracks of corresponding three-phase current benchmark letter under the effect of three-phase current ring pi regulatorNumber, after three-phase current ring pi regulator output signal and harmonic signal TFH are added, hand over a section product as modulation signal and carrier waveRaw SPWM signal, drives respectively Q1～6 and Q9～14 switching tube;
Three-phase current reference signal is added and generates InrefAs the 4th brachium pontis inductive current reference signal, feed back two modules the 4thBrachium pontis inductive current ILN1And ILN2, with the 4th brachium pontis inductive current reference signal more afterwards through pi regulator, the output obtainingSignal and harmonic signal TFH obtain modulation signal after being added, and this modulation signal and carrier wave are handed over to cut and produced SPWM signal, respectivelyDrive Q7, Q8 and Q15, Q16 switching tube;
Harmonic signal TFH is by three-phase current ring pi regulator output signal Ta1, Tb1, Tc1 and the parallel connection of unit one in parallelThe three-phase current ring pi regulator output signal Ta2 of unit two, the harmonic signal that Tb2, Tc2 synthesize are respectively added and are averagedValue generates, and this public harmonic signal TFH has eliminated because the circulation problem that parallel module parameter unbalance causes.
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| CN104065255B (en) * | 2014-03-24 | 2016-08-31 | 南京航空航天大学 | A kind of three-phase four-leg inverter circulation inhibition method in parallel based on the feedforward of zero sequence circulation |
| CN103956890B (en) * | 2014-04-01 | 2016-05-04 | 燕山大学 | A kind of three-phase four-arm photovoltaic combining inverter drain current suppressing method |
| CN104201923B (en) * | 2014-09-12 | 2016-09-28 | 南京航空航天大学 | Three-phase four-arm isolated form inverter control method |
| CN107925360B (en) * | 2015-07-28 | 2019-10-18 | Abb瑞士股份有限公司 | For limiting device, the method and computer program product of circulation |
| CN105162350B (en) * | 2015-08-03 | 2017-10-20 | 中南大学 | The three-phase micro inverter and its control method of a kind of wide loading range of high efficiency |
| CN105391088A (en) * | 2015-12-14 | 2016-03-09 | 天津理工大学 | Single-phase multi-inverter parallel system with LCL filter and control method for single-phase multi-inverter parallel system |
| US11063532B2 (en) * | 2017-05-18 | 2021-07-13 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Power conversion device superimposing a tertiary harmonic wave |
| CN108039850B (en) * | 2017-11-29 | 2020-09-01 | 上海电力学院 | Universal method for realizing SVPWM control of multiphase converter |
| CN108574424A (en) * | 2018-04-20 | 2018-09-25 | 南京邮电大学 | A kind of three-phase four-leg inverter control method improving DC voltage utilization rate |
| CN110311580A (en) * | 2019-07-29 | 2019-10-08 | 杭州中恒电气股份有限公司 | DCDC circulation control device, control method, electronic equipment and medium |
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