CN105610178A - Unbalanced load control method and control system of three-phase half-bridge inverter - Google Patents
Unbalanced load control method and control system of three-phase half-bridge inverter Download PDFInfo
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- CN105610178A CN105610178A CN201610041920.7A CN201610041920A CN105610178A CN 105610178 A CN105610178 A CN 105610178A CN 201610041920 A CN201610041920 A CN 201610041920A CN 105610178 A CN105610178 A CN 105610178A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
The invention relates to an unbalanced load control method and control system of a three-phase half-bridge inverter. The control system comprises a separation unit and a filtering unit, wherein the separation unit is used for separating a positive-sequence component and a negative-sequence component of a three-phase output voltage of the three-phase half-bridge inverter so as to generate DC amount and a frequency-doubled harmonic wave, and the filtering unit is used for synthesizing the separated positive-sequence component and the negative-sequence component again after the frequency-doubled harmonic wave is filtered so that the amplitudes of the three-phase output voltages are basically equal. Therefore, by the unbalanced load control method and control system of the three-phase half-bridge inverter, the amplitudes of the three-phase output voltages of the three-phase half-bridge inverter can be basically equal, stable output is maintained, and the balanced load control method and control system can be highly implemented.
Description
Technical field
The present invention relates to inverter circuit control technology field, relate in particular to a kind of unbalanced load of three-phase half-bridge inverterControl method and control system.
Background technology
For three-phase half-bridge inverter (DC bus-bar voltage mid point and load mid point are not connected together), because three-phase electricityBetween road, there is coupled relation, so in the time connecing unbalanced load, three-phase output voltage has larger difference, i.e. three-phase output electricityIn pressure, both contained positive-sequence component, also contained negative sequence component, the output voltage that the existence of negative sequence component makes three-phase half-bridge circuit withoutMethod stably remains on the level at 220V/50Hz.
Summary of the invention
The object of the invention is to the control method of the unbalanced load that proposes a kind of three-phase half-bridge inverter and control systemSystem, can make the amplitude of three-phase output voltage of three-phase half-bridge inverter substantially equal, keeps stable output, and exploitativeness is strong.
For reaching this object, the present invention by the following technical solutions:
First aspect, provides a kind of control method of unbalanced load of three-phase half-bridge inverter, comprising:
The positive-sequence component of the three-phase output voltage of three-phase half-bridge inverter is separated with negative sequence component, to produce DC quantityWith two frequency multiplication harmonic waves;
After filtering two frequency multiplication harmonic waves, again synthetic to separated positive-sequence component and negative sequence component, to make three-phase outputThe amplitude of voltage is substantially equal.
Wherein, described the positive-sequence component of the three-phase output voltage of three-phase half-bridge inverter is separated with negative sequence component, so thatProduce DC quantity and two frequency multiplication harmonic waves, comprising:
In forward dq coordinate system, the positive-sequence component of the three-phase output voltage of three-phase half-bridge inverter is converted into direct currentAmount, is converted into two frequency multiplication harmonic waves by the negative sequence component of the three-phase output voltage of three-phase half-bridge inverter;
In reversion dq coordinate system, the negative sequence component of the three-phase output voltage of three-phase half-bridge inverter is converted into direct currentAmount, is converted into two frequency multiplication harmonic waves by the positive-sequence component of the three-phase output voltage of three-phase half-bridge inverter.
Wherein, described filtering two frequency multiplication harmonic waves, comprise, use notch filter filtering two frequency multiplication harmonic waves, make described twoFrequency multiplication harmonic wave be output as 0 and described DC quantity be output as 220V/50Hz.
Wherein, before described filtering two frequency multiplication harmonic waves, comprising:
Described DC quantity and two frequency multiplication harmonic waves are carried out to coordinate Mapping and Converting, and the formula of described coordinate Mapping and Converting is:
Or;
Wherein, the angular frequency that ω is line voltage, xa、xb、xcBe respectively three axle components in α β coordinate system, xdAnd xqRespectivelyFor the diaxon component in dq coordinate system, x is magnitude of voltage or current value.
Wherein, described separated positive-sequence component and negative sequence component is again synthetic after, also comprise:
The output quantity of the positive-sequence component of again being synthesized and negative sequence component is carried out to inversion processing.
Second aspect, provides a kind of control system of unbalanced load of three-phase half-bridge inverter, comprising:
Separative element, for the positive-sequence component of the three-phase output voltage of three-phase half-bridge inverter is separated with negative sequence component,To produce DC quantity and two frequency multiplication harmonic waves;
Filtering unit, after filtering two frequency multiplication harmonic waves, again synthetic to separated positive-sequence component and negative sequence component, withJust make the amplitude of three-phase output voltage substantially equal.
Wherein, described separative element, specifically for:
In forward dq coordinate system, the positive-sequence component of the three-phase output voltage of three-phase half-bridge inverter is converted into direct currentAmount, is converted into two frequency multiplication harmonic waves by the negative sequence component of the three-phase output voltage of three-phase half-bridge inverter;
In reversion dq coordinate system, the negative sequence component of the three-phase output voltage of three-phase half-bridge inverter is converted into direct currentAmount, is converted into two frequency multiplication harmonic waves by the positive-sequence component of the three-phase output voltage of three-phase half-bridge inverter.
Wherein, described filtering two frequency multiplication harmonic waves, comprise, use notch filter filtering two frequency multiplication harmonic waves, make described twoFrequency multiplication harmonic wave be output as 0 and described DC quantity be output as 220V/50Hz.
Wherein, the control system of the unbalanced load of described three-phase half-bridge inverter also comprises converting unit, described conversionUnit, for:
Described DC quantity and two frequency multiplication harmonic waves are carried out to coordinate Mapping and Converting, and the formula of described coordinate Mapping and Converting is:
Or;
Wherein, the angular frequency that ω is line voltage, xa、xb、xcBe respectively three axle components in α β coordinate system, xdAnd xqRespectivelyFor the diaxon component in dq coordinate system, x is magnitude of voltage or current value.
Wherein, the control system of the unbalanced load of described three-phase half-bridge inverter also comprises inversion unit, described inversionUnit, for carrying out inversion processing to the output quantity of the positive-sequence component of again being synthesized and negative sequence component.
Beneficial effect of the present invention is: a kind of control method of unbalanced load of three-phase half-bridge inverter and control systemSystem, comprises separative element and filtering unit, and described separative element, for by the three-phase output voltage of three-phase half-bridge inverter justOrder component separates with negative sequence component, to produce DC quantity and two frequency multiplication harmonic waves; Described filtering unit, humorous for filtering two frequencys multiplicationAfter ripple, again synthetic to separated positive-sequence component and negative sequence component, to make the amplitude of three-phase output voltage substantially equal. CanSee that the control method of the unbalanced load of this three-phase half-bridge inverter and control system can make three of three-phase half-bridge inverterThe amplitude of phase output voltage is substantially equal, keeps stable output, and exploitativeness is strong.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, institute in describing the embodiment of the present invention belowNeed the accompanying drawing using to be briefly described, apparently, the accompanying drawing in the following describes is only enforcements more of the present inventionExample, for those of ordinary skill in the art, is not paying under the prerequisite of creative work, can also be according to the invention processThe content of example and these accompanying drawings obtain other accompanying drawing.
Fig. 1 is the side of first embodiment of control method of the unbalanced load of three-phase half-bridge inverter provided by the inventionMethod flow chart.
Fig. 2 is the side of second embodiment of control method of the unbalanced load of three-phase half-bridge inverter provided by the inventionMethod flow chart.
Fig. 3 is that the control method of the unbalanced load of application three-phase half-bridge inverter provided by the invention is carried out positive-sequence componentThe control block diagram separating with negative sequence component.
Fig. 4 is positive-sequence component and the negative phase-sequence of the control method of the unbalanced load of three-phase half-bridge inverter provided by the inventionThe control block diagram of component.
Fig. 5 is the knot of first embodiment of control system of the unbalanced load of three-phase half-bridge inverter provided by the inventionStructure block diagram.
Fig. 6 is the knot of second embodiment of control system of the unbalanced load of three-phase half-bridge inverter provided by the inventionStructure block diagram.
Detailed description of the invention
For the technical scheme of technical problem that the present invention is solved, employing and the technique effect that reaches clearer, belowIn connection with accompanying drawing, the technical scheme of the embodiment of the present invention is described in further detail, obviously, described embodiment onlyThe present invention's part embodiment, instead of whole embodiment. Based on the embodiment in the present invention, those skilled in the art existDo not make the every other embodiment obtaining under creative work prerequisite, all belong to the scope of protection of the invention.
Embodiment 1
Please refer to Fig. 1, its be three-phase half-bridge inverter provided by the invention unbalanced load control method firstThe method flow diagram of embodiment. The control method of the unbalanced load of the three-phase half-bridge inverter that the embodiment of the present invention provides, canBe applied to various forms of three-phase half-bridge inverters.
The control method of the unbalanced load of this three-phase half-bridge inverter, comprising:
Step S101, the positive-sequence component of the three-phase output voltage of three-phase half-bridge inverter is separated with negative sequence component, so thatProduce DC quantity and two frequency multiplication harmonic waves.
It should be noted that, AC electric power systems is all generally ABC three-phase, and the positive-sequence component of power system, negative phase-sequenceComponent and zero-sequence component are next fixed according to the order of ABC three-phase. Wherein, positive-sequence component is the mutually leading B of A 120 degree mutually, B phaseLeading C is 120 degree mutually, and the mutually leading A of C is 120 degree mutually. Negative sequence component is that A falls behind B 120 degree mutually mutually, and B falls behind C 120 degree mutually mutually, and C falls mutuallyRear A is 120 degree mutually. Zero-sequence component is that ABC three-phase phase is identical, and which is not leading mutually yet, and which also keeps up with mutually.
After step S102, filtering two frequency multiplication harmonic waves, again synthetic to separated positive-sequence component and negative sequence component, to makeThe amplitude of three-phase output voltage is substantially equal.
It should be noted that, the AC electric power systems of practical application unavoidably has some losses, and absolute three-phase is defeatedThe amplitude that goes out voltage equates generally cannot realize, so, only require that the amplitude of three-phase output voltage equates substantially.
Wherein, filtering two frequency multiplication harmonic waves and the method that separated positive-sequence component and negative sequence component are synthesized are again a lot,Those skilled in the art can, according to common practise, under the technical background of the technical program, select various forms, as long as canThe object that realizes respectively filtering two frequency multiplication harmonic waves and separated positive-sequence component and negative sequence component are synthesized again, herein notRepeat for example again
The control method of the unbalanced load of the three-phase half-bridge inverter that the embodiment of the present invention provides, can make three-phase half-bridgeThe amplitude of the three-phase output voltage of inverter is substantially equal, keeps stable output, and exploitativeness is strong.
Embodiment 2
Please refer to Fig. 2, it is second of the control method of the unbalanced load of three-phase half-bridge inverter provided by the inventionThe method flow diagram of embodiment. The control method of the unbalanced load of the three-phase half-bridge inverter of the embodiment of the present invention is at firstOn the basis of embodiment, to three-phase output voltage being separated into positive-sequence component and negative sequence component, filtering two frequency multiplication harmonic waves and quiltThe process that the positive-sequence component separating and negative sequence component synthesize again illustrates respectively.
The control method of the unbalanced load of this three-phase half-bridge inverter, comprising:
Step S201a, in forward dq coordinate system, the positive-sequence component of the three-phase output voltage of three-phase half-bridge inverter is turnedTurn to DC quantity, the negative sequence component of the three-phase output voltage of three-phase half-bridge inverter is converted into two frequency multiplication harmonic waves.
Step S201b, in reversion dq coordinate system, the negative sequence component of the three-phase output voltage of three-phase half-bridge inverter is turnedTurn to DC quantity, the positive-sequence component of the three-phase output voltage of three-phase half-bridge inverter is converted into two frequency multiplication harmonic waves.
It should be noted that, step S201a and step S201b there is no dividing of sequencing, and alternatively implements.
Step S202, described DC quantity and two frequency multiplication harmonic waves are carried out to coordinate Mapping and Converting.
Wherein, the formula of described coordinate Mapping and Converting is:
Or;
Wherein, the angular frequency that ω is line voltage, xa、xb、xcBe respectively three axle components in α β coordinate system, xdAnd xqRespectivelyFor the diaxon component in dq coordinate system, x is magnitude of voltage or current value.
Above-mentioned two formulas are actually the transformational relation between abc coordinate system and forward dq coordinate system, as long as by formulaChange into-ω of ω t t, can obtain the transformational relation between abc coordinate system and reversion dq coordinate system. Pay particular attention to, rightIn the in addition amplitude limit of modulating wave of output, to prevent the phenomenon of ovennodulation.
It should be noted that:
In α β two-phase rest frame, the positive-sequence component of output voltage and negative sequence component are respectively with equal and opposite in direction, directionContrary angular velocity omega and-ω synchronous backward rotation. Expression formula is:
uαβ＝ejωtupdq+e-jωtundq，
The angular frequency that in above formula, ω is line voltage, updqAnd undqBe respectively positive-sequence component, the negative phase-sequence of output three-phase voltageThe component of component under dq coordinate system,
In dq two-phase synchronous rotating frame, to above formula, distortion arranges and can obtain:
e-jωtuαβ＝updq+e-2jωtundq，
That is to say, in forward dq coordinate system, positive-sequence component is converted into DC quantity, and negative sequence component is converted into two timesHarmonic component frequently; In like manner, if by dq coordinate system with angular speed-ω opposite spin, negative sequence component is converted into DC quantity,And positive-sequence component is converted into two frequency multiplication harmonic waves.
For two frequency multiplication harmonic waves, can be with wave filter by its filtering. In forward dq coordinate system, just only contain output soThe positive-sequence component of voltage; In reversion dq coordinate system, the negative sequence component that just only contains output voltage. As long as now make negative sequence componentSet-point be 0, can suppress negative sequence component completely, make the amplitude of three-phase output voltage substantially equal.
Step S203, use notch filter filtering two frequency multiplication harmonic waves, make described two frequency multiplication harmonic waves be output as 0 and instituteState DC quantity and be output as 220V/50Hz.
Notch filter refers to that the signal of some CFs (refering in particular to two frequencys multiplication here) is had to very strong decayEffect, does not almost have noisy a kind of special wave filter for the signal of other frequency. The transmission letter of notch filterNumber is:
Wherein, ω0For the frequency of desired filtering. Q is one and controls ω0The attenuation multiple of place's frequency and near frequency thereofPhysical quantity. In general, Q is larger, and the multiple of decay is also just larger. Generally, Q need to get larger value, because stateIn household electrical appliances network planning model, there is regulation, can fluctuate ± 2.5Hz of the frequency of line voltage, namely 47.5Hz is to 52.5Hz. Work as electrical networkWhen fluctuation appears in the frequency of voltage, notch filter should still can be accomplished very large decay to two frequency multiplication harmonic waves.
Please refer to Fig. 3, it is that the control method of the unbalanced load of application three-phase half-bridge inverter provided by the invention is enteredThe control block diagram that row positive-sequence component separates with negative sequence component. Wherein, ua、ub、ucBe respectively three-phase output quantity, abc/dq+ and abc/Dq-represents the Coordinate Conversion mistake of the Mathematical Modeling under Mathematical Modeling and the synchronous rotary dq coordinate system under the static α β of two-phase coordinate systemJourney, wave filter represents filtering.
Step S204, separated positive-sequence component and negative sequence component is again synthetic, to make the width of three-phase output voltageBe worth substantially equal.
Step S205, the output quantity of the positive-sequence component of again being synthesized and negative sequence component is carried out to inversion processing.
Please refer to Fig. 4, it is the positive sequence of the control method of the unbalanced load of three-phase half-bridge inverter provided by the inventionThe control block diagram of component and negative sequence component. Wherein, 0 is set-point, undBe sampled value, PI is proportional plus integral control
The control method of the unbalanced load of the three-phase half-bridge inverter that the embodiment of the present invention provides, can make three-phase half-bridgeThe amplitude of the three-phase output voltage of inverter is substantially equal, keeps the output of stable 220V/50Hz, and exploitativeness is strong.
The embodiment of the control system of the unbalanced load of the three-phase half-bridge inverter providing for the embodiment of the present invention below.The imbalance of the embodiment of the control system of the unbalanced load of three-phase half-bridge inverter and above-mentioned three-phase half-bridge inverter is negativeThe embodiment of the control method of carrying belongs to same design, the embodiment of the control system of the unbalanced load of three-phase half-bridge inverterIn the detail content of detailed description not, can be with reference to the enforcement of the control method of the unbalanced load of above-mentioned three-phase half-bridge inverterExample. This system realizes with computer program, and this system is the functional software framework of realizing with computer program.
Embodiment 3
Please refer to Fig. 5, its be three-phase half-bridge inverter provided by the invention unbalanced load control system firstThe block diagram of embodiment. The control system of the unbalanced load of the three-phase half-bridge inverter that the embodiment of the present invention provides, canBe applied to various forms of three-phase half-bridge inverters.
The control system of the unbalanced load of this three-phase half-bridge inverter, comprising:
Separative element, for the positive-sequence component of the three-phase output voltage of three-phase half-bridge inverter is separated with negative sequence component,To produce DC quantity and two frequency multiplication harmonic waves;
Filtering unit, after filtering two frequency multiplication harmonic waves, again synthetic to separated positive-sequence component and negative sequence component, withJust make the amplitude of three-phase output voltage substantially equal.
The control system of the unbalanced load of the three-phase half-bridge inverter that the embodiment of the present invention provides, can make three-phase half-bridgeThe amplitude of the three-phase output voltage of inverter is substantially equal, keeps stable output, and exploitativeness is strong.
Embodiment 4
Please refer to Fig. 6, it is second of the control system of the unbalanced load of three-phase half-bridge inverter provided by the inventionThe block diagram of embodiment. The control system of the unbalanced load of the three-phase half-bridge inverter that the embodiment of the present invention provides isOn the basis of an embodiment, converting unit and inversion unit are increased.
The control system of the unbalanced load of this three-phase half-bridge inverter, comprising:
Separative element, for the positive-sequence component of the three-phase output voltage of three-phase half-bridge inverter is separated with negative sequence component,To produce DC quantity and two frequency multiplication harmonic waves;
Filtering unit, after filtering two frequency multiplication harmonic waves, again synthetic to separated positive-sequence component and negative sequence component, withJust make the amplitude of three-phase output voltage substantially equal.
Wherein, described separative element, specifically for:
In forward dq coordinate system, the positive-sequence component of the three-phase output voltage of three-phase half-bridge inverter is converted into direct currentAmount, is converted into two frequency multiplication harmonic waves by the negative sequence component of the three-phase output voltage of three-phase half-bridge inverter;
In reversion dq coordinate system, the negative sequence component of the three-phase output voltage of three-phase half-bridge inverter is converted into direct currentAmount, is converted into two frequency multiplication harmonic waves by the positive-sequence component of the three-phase output voltage of three-phase half-bridge inverter.
Wherein, described filtering two frequency multiplication harmonic waves, comprise, use notch filter filtering two frequency multiplication harmonic waves, make described twoFrequency multiplication harmonic wave be output as 0 and described DC quantity be output as 220V/50Hz.
Wherein, the control system of the unbalanced load of described three-phase half-bridge inverter also comprises converting unit, described conversionUnit, for:
Described DC quantity and two frequency multiplication harmonic waves are carried out to coordinate Mapping and Converting, and the formula of described coordinate Mapping and Converting is:
Or;
Wherein, the angular frequency that ω is line voltage, xa、xb、xcBe respectively three axle components in α β coordinate system, xdAnd xqRespectivelyFor the diaxon component in dq coordinate system, x is magnitude of voltage or current value.
Wherein, the control system of the unbalanced load of described three-phase half-bridge inverter also comprises inversion unit, described inversionUnit, for carrying out inversion processing to the output quantity of the positive-sequence component of again being synthesized and negative sequence component.
The control system of the unbalanced load of the three-phase half-bridge inverter that the embodiment of the present invention provides, can make three-phase half-bridgeThe amplitude of the three-phase output voltage of inverter is substantially equal, keeps the output of stable 220V/50Hz, and exploitativeness is strong.
The control method of the unbalanced load of three-phase half-bridge inverter and a control system, can make three-phase semi-bridge inversionThe amplitude of the three-phase output voltage of device is substantially equal, keeps stable output, and exploitativeness is strong.
One of ordinary skill in the art will appreciate that all or part of step that realizes above-described embodiment can pass through hardwareComplete, also can carry out the hardware that instruction is relevant by program and complete, this program can be stored in a computer-readable storage mediumIn matter, storage medium can comprise memory, disk or CD etc.
Above content is only preferred embodiment of the present invention, for those of ordinary skill in the art, according to of the present inventionThought, all will change in specific embodiments and applications, and this description should not be construed as the present inventionRestriction.
Claims (10)
1. a control method for the unbalanced load of three-phase half-bridge inverter, is characterized in that, comprising:
The positive-sequence component of the three-phase output voltage of three-phase half-bridge inverter is separated with negative sequence component, to produce DC quantity and twoFrequency multiplication harmonic wave;
After filtering two frequency multiplication harmonic waves, again synthetic to separated positive-sequence component and negative sequence component, to make three-phase output voltageAmplitude substantially equal.
2. the control method of the unbalanced load of three-phase half-bridge inverter according to claim 1, is characterized in that, described inThe positive-sequence component of the three-phase output voltage of three-phase half-bridge inverter is separated with negative sequence component, to produce DC quantity and two frequencys multiplicationHarmonic wave, comprising:
In forward dq coordinate system, the positive-sequence component of the three-phase output voltage of three-phase half-bridge inverter is converted into DC quantity, willThe negative sequence component of the three-phase output voltage of three-phase half-bridge inverter is converted into two frequency multiplication harmonic waves;
In reversion dq coordinate system, the negative sequence component of the three-phase output voltage of three-phase half-bridge inverter is converted into DC quantity, willThe positive-sequence component of the three-phase output voltage of three-phase half-bridge inverter is converted into two frequency multiplication harmonic waves.
3. the control method of the unbalanced load of three-phase half-bridge inverter according to claim 1, is characterized in that, described inFiltering two frequency multiplication harmonic waves, comprise, use notch filter filtering two frequency multiplication harmonic waves, make described two frequency multiplication harmonic waves be output as 0Be output as 220V/50Hz with described DC quantity.
4. the control method of the unbalanced load of three-phase half-bridge inverter according to claim 1, is characterized in that, described inBefore filtering two frequency multiplication harmonic waves, comprising:
Described DC quantity and two frequency multiplication harmonic waves are carried out to coordinate Mapping and Converting, and the formula of described coordinate Mapping and Converting is:
Or;
Wherein, the angular frequency that ω is line voltage, xa、xb、xcBe respectively three axle components in α β coordinate system, xdAnd xqBe respectively dqDiaxon component in coordinate system, x is magnitude of voltage or current value.
5. the control method of the unbalanced load of three-phase half-bridge inverter according to claim 1, is characterized in that, described inAfter separated positive-sequence component and negative sequence component is again synthetic, also comprise:
The output quantity of the positive-sequence component of again being synthesized and negative sequence component is carried out to inversion processing.
6. a control system for the unbalanced load of three-phase half-bridge inverter, is characterized in that, comprising:
Separative element, for the positive-sequence component of the three-phase output voltage of three-phase half-bridge inverter is separated with negative sequence component, so thatProduce DC quantity and two frequency multiplication harmonic waves;
Filtering unit, after filtering two frequency multiplication harmonic waves, again synthetic to separated positive-sequence component and negative sequence component, to makeThe amplitude of three-phase output voltage is substantially equal.
7. the control system of the unbalanced load of three-phase half-bridge inverter according to claim 6, is characterized in that, described inSeparative element, specifically for:
In forward dq coordinate system, the positive-sequence component of the three-phase output voltage of three-phase half-bridge inverter is converted into DC quantity, willThe negative sequence component of the three-phase output voltage of three-phase half-bridge inverter is converted into two frequency multiplication harmonic waves;
In reversion dq coordinate system, the negative sequence component of the three-phase output voltage of three-phase half-bridge inverter is converted into DC quantity, willThe positive-sequence component of the three-phase output voltage of three-phase half-bridge inverter is converted into two frequency multiplication harmonic waves.
8. the control system of the unbalanced load of three-phase half-bridge inverter according to claim 6, is characterized in that, described inFiltering two frequency multiplication harmonic waves, comprise, use notch filter filtering two frequency multiplication harmonic waves, make described two frequency multiplication harmonic waves be output as 0Be output as 220V/50Hz with described DC quantity.
9. the control system of the unbalanced load of three-phase half-bridge inverter according to claim 6, is characterized in that, described inThe control system of the unbalanced load of three-phase half-bridge inverter also comprises converting unit, described converting unit, for:
Described DC quantity and two frequency multiplication harmonic waves are carried out to coordinate Mapping and Converting, and the formula of described coordinate Mapping and Converting is:
Or;
Wherein, the angular frequency that ω is line voltage, xa、xb、xcBe respectively three axle components in α β coordinate system, xdAnd xqBe respectively dqDiaxon component in coordinate system, x is magnitude of voltage or current value.
10. the control system of the unbalanced load of three-phase half-bridge inverter according to claim 6, is characterized in that, instituteThe control system of stating the unbalanced load of three-phase half-bridge inverter also comprises inversion unit, and described inversion unit, for heavy to quiltNew synthetic positive-sequence component and the output quantity of negative sequence component are carried out inversion processing.
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