CN101895119B - Compensation system of parallel-type active electric power filter - Google Patents
Compensation system of parallel-type active electric power filter Download PDFInfo
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- CN101895119B CN101895119B CN2010101284426A CN201010128442A CN101895119B CN 101895119 B CN101895119 B CN 101895119B CN 2010101284426 A CN2010101284426 A CN 2010101284426A CN 201010128442 A CN201010128442 A CN 201010128442A CN 101895119 B CN101895119 B CN 101895119B
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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
- Y02E40/20—Active power filtering [APF]
Abstract
The invention provides a compensation system of a parallel-type active electric power filter. The compensation system comprises a bus control loop, a compensation current control loop and a harmonic control loop, wherein the output of the bus control loop and the output of the harmonic control loop are jointly taken as the preset of the compensation current control loop. The harmonic control loop comprises a harmonic analysis module, a harmonic controller and a comprehension module, wherein the harmonic analysis module is used for analyzing three-phase power supply current and extracting various harmonics that need to be compensated and idle current, the harmonic controller is used for regulating various harmonics and the idle current, and the comprehension module is used for summarizing regulation amounts of various harmonics and the idle current so as to produce a comprehensive compensation instruction, wherein the comprehensive compensation instruction is output to the comprehensive current control loop. By implementing the technical scheme, the invention naturally compensates the disturbance of a power supply as the outer loop error is actually the harmonics and idle ingredients of the power supply current and can realize the complete compensation of the harmonics and the idle current.
Description
Technical field
The present invention relates to electric and electronic technical field, more particularly, relate to the bucking-out system of parallel connection type active electric filter.
Background technology
Along with rapid development of economy; The application of rectifier, RHVC, arc furnace and various power electronic equipments constantly increases in the electrical network; A large amount of harmonic waves that they will produce and idle injection electrical network have caused severe contamination to power supply quality, have become the major reason that influences the quality of power supply.Active Power Filter-APF (Active Power Filter; APF) be a kind of novel electric power electric device that is used for dynamically suppressing harmonic wave, compensating reactive power; Have compensation harmonic simultaneously and idle, dynamic response fast, be not easy the advantages such as influence that not changed by mains frequency with electric network impedance generation resonance, compensation performance, becomes a kind of important means of harmonic wave control and idle improvement.
The topological structure of Active Power Filter-APF can be divided into two kinds of tandem type and parallel connection types, and wherein the application of parallel connection type is the most extensive.Fig. 1 is the composition diagram of parallel connection type active electric filter canonical system, and is as shown in Figure 1, and three-phase power converters is parallelly connected with load.The operation principle of parallel connection type active electric filter system is: at first, from target compensation, detect harmonic current and reactive current, its summation and reversed polarity are compensated the instruction of electric current.Thereafter, Active Power Filter-APF sends offset current according to this instruction, is injected in this system.Because of offset current harmonic electric current and reactive current sum equal and opposite in direction, polarity are opposite, both cancel out each other.Finally, only contain fundametal compoment in the source current, the quality of power supply thereby be improved.Fig. 2 is the control block diagram of the bucking-out system of existing a kind of parallel connection type active electric filter.Specify below in conjunction with Fig. 1, this system is made up of bus control ring 100, harmonic analysis and summation loop 400 and offset current control ring 300 threes.Wherein, offset current control ring 300 is core and executors of bucking-out system, and effect is to realize the good tracing preset of offset current.The output of offset current controller Gc in the offset current control ring 300 is connected to modulation module PWM, and the control impuls of being sent by modulation module PWM drives the three-phase power converters among Fig. 1.As ring in the control, the given of offset current control ring 300 is made up of two parts, is respectively the output of the output harmonic analysis and synthesis link 400 of bus control ring 100.Wherein, bus control ring 100 provides stable DC link for Active Power Filter-APF, the output of bus control ring 100 median generatrix controller Gv respectively with each supply voltage u mutually
Sa/ u
Sb/ u
ScMultiply each other, product is the given first of current regulator 300 by way of compensation, thereby guarantees that the required input current of bus is and the three-phase fundamental current of supply voltage homophase not introduce harmonic wave and idle.Harmonic analysis and summation loop 400 are then particularly important, and harmonic analysis and summation loop 400 comprise harmonic analysis modules A lysp and comprehensive module ∑ p.Harmonic analysis modules A lysp is respectively to the threephase load current i
La/ i
Lb/ i
LcAnalyze, extract each harmonic and reactive current, produce comprehensive compensation instruction i by comprehensive module ∑ p summation then
Ha/ i
Hb/ i
Hc, the comprehensive compensation that is produced is instructed the given second portion of current regulator by way of compensation, and with the output of bus control ring 100 given as interior ring jointly.
Yet this scheme is with load current i
La/ i
Lb/ i
LcBe target compensation, belong to the open loop control strategy in essence, power supply is not had a vulnerability to jamming, compensation performance is relatively poor.In addition, when capacity to be compensated exceeds the compensation ability of Active Power Filter-APF, generally take offset current greater than the then measure of hardware current limliting of threshold values, this will cause offset current to cut the top, on the contrary power supply injected abundant more harmonic wave.
Summary of the invention
The technical problem that the present invention will solve is, to prior art power supply do not had a defective of vulnerability to jamming, poor-performing, and a kind of bucking-out system of parallel connection type active electric filter is provided, and realizes the good compensation of harmonic wave and reactive current.
The technical solution adopted for the present invention to solve the technical problems is: the bucking-out system of constructing a kind of parallel connection type active electric filter; Comprise: bus control ring and offset current control ring, wherein, the bus control ring is used to Active Power Filter-APF stable DC is provided; It is characterized in that; Also comprise the harmonic wave control ring, and the output of the output of said bus control ring and said harmonic wave control ring given as said offset current control ring jointly, said harmonic wave control ring comprises:
The harmonic analysis module is used for the three phase mains electric current is analyzed, and extracts the each harmonic and the reactive current of required compensation;
Harmonic controller is used for said each harmonic and reactive current are regulated;
Comprehensive module is used for the regulated quantity summation of each harmonic and reactive current is instructed to produce comprehensive compensation, and said comprehensive compensation instruction exports said offset current control ring to;
Wherein, Said harmonic controller comprises integral controller (210) and second proportional controller (230) that is used for the integration adjusting; Wherein, integral controller (210) carries out integration earlier to be regulated, and second proportional controller (230) carries out the adjusting of second ratio to specific subharmonic current and reactive current again; And the proportionality coefficient that this second ratio is regulated is less than 1, and the part of uncompensation is feedovered to the harmonic analysis module.
In the bucking-out system of parallel connection type active electric filter of the present invention; Said harmonic wave control ring also comprises the 3rd proportional controller; Comprehensive module each harmonic electric current and reactive current are carried out comprehensive after; The 3rd proportional controller to said comprehensive compensation instruction carry out the 3rd ratio and regulate, and the proportionality coefficient that the 3rd ratio is regulated is less than 1, and the part of uncompensation is feedovered to the harmonic analysis module.
In the bucking-out system of parallel connection type active electric filter of the present invention, said harmonic analysis module is used for the three phase mains electric current is carried out Fourier analysis.
In the bucking-out system of parallel connection type active electric filter of the present invention, said bus control ring comprises bus controller.
In the bucking-out system of parallel connection type active electric filter of the present invention, said bus controller is to be used for the controller that ratio-integration is regulated.
In the bucking-out system of parallel connection type active electric filter of the present invention, said offset current control ring comprises the offset current controller.
In the bucking-out system of parallel connection type active electric filter of the present invention, said offset current controller is to be used for the controller that ratio-integration is regulated.
The bucking-out system of the parallel connection type active electric filter of embodiment of the present invention because the outer shroud error is actually the source current harmonics, has just compensated the disturbance of power supply naturally behind the harmonic wave control ring of employing closed-loop control, can realize the compensation of harmonic wave or reactive current; In addition, can regulate harmonic current and reactive current to be compensated according to the limit value of the offset current of Active Power Filter-APF, therefore can be because of cutting the top to the unnecessary harmonic wave of electrical network injection.
Description of drawings
To combine accompanying drawing and embodiment that the present invention is described further below, in the accompanying drawing:
Fig. 1 is the composition diagram of the canonical system of parallel connection type active electric filter;
Fig. 2 is the control block diagram of the bucking-out system of existing a kind of parallel connection type active electric filter;
Fig. 3 is the control block diagram of parallel connection type active electric filter bucking-out system of the present invention;
Fig. 4 is the control block diagram of parallel connection type active electric filter bucking-out system embodiment one of the present invention;
Fig. 5 is the control block diagram of parallel connection type active electric filter bucking-out system embodiment two of the present invention;
Fig. 6 is the control block diagram of parallel connection type active electric filter bucking-out system embodiment three of the present invention;
Fig. 7 is the control block diagram of parallel connection type active electric filter bucking-out system embodiment four of the present invention.
Embodiment
Fig. 3 is the control block diagram of parallel connection type active electric filter bucking-out system.This compensation control system comprises bus control ring 100, harmonic wave control ring 200 and offset current control ring 300.Offset current control ring 300 is realized the good tracing preset of offset current.Bus control ring 100 provides stable DC link for Active Power Filter-APF.And harmonic wave control ring 200; It then is emphasis of the present invention place; Its distinct characteristic that is different from the prior art scheme is that target compensation adopts source current to replace load current, and has introduced harmonic controller Gc ' each harmonic and the reactive current of required compensation are regulated.Harmonic wave control ring 200 comprises harmonic analysis modules A lys, harmonic controller Gc ' and comprehensive module ∑.At first, harmonic analysis modules A lys is respectively to the three phase mains current i
Sa/ i
Sb/ i
ScAnalyze, extract the each harmonic and the reactive current of required compensation; Then, harmonic controller Gc ' regulates each harmonic and reactive current; At last, instruct to produce comprehensive compensation by comprehensive module ∑ summation again.The given of offset current control ring 300 formed in the output of bus control ring 100 harmonic control rings 200 jointly, is responsible for implementing to carry out by offset current control ring 300.Analyze theoretically, this programme is equivalent to the offset current dicyclo control that is given as load harmonic wave and reactive current.Because the outer shroud error is actually the harmonic wave and the idle composition of source current, just compensated the disturbance of power supply behind employing this programme naturally, can realize the full remuneration of harmonic wave and reactive current.
On the basis of above-mentioned control block diagram shown in Figure 3, harmonic controller Gc ' can adopt different regulation rates, and Fig. 4 and Fig. 5 have enumerated two various embodiment.As shown in Figure 4, in the control block diagram of parallel connection type active electric filter bucking-out system embodiment one of the present invention, harmonic controller is preferably integral controller 210.Harmonic analysis modules A lys extracts after the each harmonic and reactive current in the source current, and harmonic controller 210 carries out integration to it to be regulated, in case exist harmonic wave or reactive current just to accumulate in the source current, electric current loop 300 is given by way of compensation.Therefore, through the effect of harmonic wave control ring 200, finally reach the harmonic wave eliminated fully in the source current and the purpose of reactive current.
Fig. 5 is the control block diagram of parallel connection type active electric filter bucking-out system embodiment two of the present invention.In practical application, cause system oscillation for fear of overcompensation, Active Power Filter-APF has the demand of part compensation.Just, specific subharmonic or reactive current are carried out undercompensation.In the present embodiment, harmonic controller is preferably first proportional controller 220, and the proportionality coefficient K of this first proportional controller
iBe the corresponding proportional control factor of the i time harmonic wave to be compensated or reactive current, regulation K
iGet value less than 1.According to the actual requirements, the desirable different proportional control factor of the harmonic wave of homogeneous or reactive current not.The gain of supposing the offset current ring is 1, can push away to such an extent that i subharmonic or reactive-current compensation ratio are K
i/ (K
i+ 1), thus the function of implementation part compensation.
Fig. 6 is the control block diagram of parallel connection type active electric filter bucking-out system embodiment three of the present invention, and this embodiment shows on the basis of embodiment one to dissolve.Therefore, the same section of itself and embodiment one is not done at this and is given unnecessary details, and below its different piece only is described.Compare embodiment one, this harmonic controller also comprises second proportional controller 230, and the proportionality coefficient K of this second proportional controller
iBe the part penalty coefficient of the i time harmonic wave to be compensated or reactive current, also promptly compensate percentage, get K
i<1.Equally can be according to the actual requirements, the harmonic wave of homogeneous or reactive current are not got the different portions penalty coefficient.Present embodiment earlier carries out integration through integral controller 210 to be regulated, and carries out ratio through second proportional controller 230 again and regulates, then with the 1-K of uncompensation
iPart feedovers to harmonic analysis modules A lys, also i.e. cancellation in harmonic wave control ring 200 given, thus reach the purpose that part compensates.Certainly, if get K
i=1, then specific the i time harmonic wave to be compensated or reactive current are carried out full remuneration, compare embodiment one and seem more flexible.
Fig. 7 is the control block diagram of parallel connection type active electric filter bucking-out system embodiment four of the present invention, and this bucking-out system develops on the basis of embodiment three.Therefore, the same section of itself and embodiment three is not done at this and is given unnecessary details, and below its different piece only is described.Compare embodiment three, this harmonic wave control ring 200 also comprises the 3rd proportional controller 240, and the proportionality coefficient K of the 3rd proportional controller is the current limliting coefficient, and K < 1.Comprehensive module ∑ is after suing for peace to each harmonic and reactive current; Carrying out ratio through the 3rd proportional controller 240 regulates; Same mode with feedforward; Adjust this proportionality coefficient in real time according to the given effective value of ring in the offset current, the given effective value of ring is constantly equal to limit value in making, thereby realizes the compensation current-limiting function.This current-limiting mode internally given integral body of ring carries out reduced scale, therefore can not cause offset current to cut the top and power supply is injected unnecessary harmonic wave.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (7)
1. the bucking-out system of a parallel connection type active electric filter; Comprise bus control ring (100) and offset current control ring (300), wherein, bus control ring (100) is used to Active Power Filter-APF provides stable DC; It is characterized in that; Also comprise harmonic wave control ring (200), and the output of the output of said bus control ring (100) and said harmonic wave control ring (200) given as said offset current control ring (300) jointly, said harmonic wave control ring (200) comprising:
The harmonic analysis module is used for the three phase mains electric current is analyzed, and extracts the each harmonic and the reactive current of required compensation;
Harmonic controller is used for said each harmonic and reactive current are regulated;
Comprehensive module is used for the regulated quantity summation of each harmonic and reactive current is instructed to produce comprehensive compensation, and said comprehensive compensation instruction exports said offset current control ring (300) to;
Wherein, Said harmonic controller comprises integral controller (210) and second proportional controller (230) that is used for the integration adjusting; Wherein, integral controller (210) carries out integration earlier to be regulated, and second proportional controller (230) carries out the adjusting of second ratio to specific subharmonic current and reactive current again; And the proportionality coefficient that this second ratio is regulated is less than 1, and the part of uncompensation is feedovered to the harmonic analysis module.
2. the bucking-out system of parallel connection type active electric filter according to claim 1; It is characterized in that; Said harmonic wave control ring (200) also comprises the 3rd proportional controller (240), comprehensive module each harmonic electric current and reactive current are carried out comprehensive after, the 3rd proportional controller (240) carries out the 3rd ratio to said comprehensive compensation instruction to be regulated; And the proportionality coefficient that the 3rd ratio is regulated is less than 1, and the part of uncompensation is feedovered to the harmonic analysis module.
3. the bucking-out system of parallel connection type active electric filter according to claim 1 is characterized in that, said harmonic analysis module is used for the three phase mains electric current is carried out Fourier analysis.
4. the bucking-out system of parallel connection type active electric filter according to claim 1 is characterized in that, said bus control ring comprises bus controller (Gv).
5. the bucking-out system of parallel connection type active electric filter according to claim 4 is characterized in that, said bus controller (Gv) is for being used for the controller that ratio-integration is regulated.
6. the bucking-out system of parallel connection type active electric filter according to claim 1 is characterized in that, said offset current control ring (300) comprises offset current controller (Gc).
7. the bucking-out system of parallel connection type active electric filter according to claim 6 is characterized in that, said offset current controller (Gc) is for being used for the controller that ratio-integration is regulated.
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| CN2010101284426A CN101895119B (en) | 2010-03-18 | 2010-03-18 | Compensation system of parallel-type active electric power filter |
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| CN2010101284426A CN101895119B (en) | 2010-03-18 | 2010-03-18 | Compensation system of parallel-type active electric power filter |
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| CN101895119B true CN101895119B (en) | 2012-11-21 |
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| CN102082439B (en) * | 2011-01-25 | 2013-03-20 | 深圳市华冠电气有限公司 | Method and device for optimizing quality of electric energy |
| CN201994674U (en) * | 2011-03-02 | 2011-09-28 | 英利能源（中国）有限公司 | Reactive power compensation and harmonic suppression device for photovoltaic grid-combined system |
| GB2501565B (en) * | 2012-11-15 | 2014-10-01 | Control Tech Ltd | Reduction of periodic disturbances |
| CN103887797B (en) * | 2014-03-03 | 2016-01-06 | 西安西驰电能技术有限公司 | A kind of control method of Active Power Filter-APF offset current current limliting |
| CN111525584B (en) * | 2020-07-06 | 2020-10-13 | 深圳华工能源技术有限公司 | Intelligent power distribution and utilization system power saving method based on omnibearing power quality optimization treatment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101277016A (en) * | 2007-03-05 | 2008-10-01 | 盈正豫顺电子股份有限公司 | Active electric filter device as well as control method |
| CN201260080Y (en) * | 2008-08-29 | 2009-06-17 | 东莞市友美电源设备有限公司 | Device for passive compensation and harmonic wave control for intelligent electric power system |
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| JPH06284576A (en) * | 1993-03-26 | 1994-10-07 | Meidensha Corp | Active filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101277016A (en) * | 2007-03-05 | 2008-10-01 | 盈正豫顺电子股份有限公司 | Active electric filter device as well as control method |
| CN201260080Y (en) * | 2008-08-29 | 2009-06-17 | 东莞市友美电源设备有限公司 | Device for passive compensation and harmonic wave control for intelligent electric power system |
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| JP特开平6-284576A 1994.10.07 |
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