CN103259277A - Three-phase load unbalance compensator - Google Patents
Three-phase load unbalance compensator Download PDFInfo
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- CN103259277A CN103259277A CN2013102235971A CN201310223597A CN103259277A CN 103259277 A CN103259277 A CN 103259277A CN 2013102235971 A CN2013102235971 A CN 2013102235971A CN 201310223597 A CN201310223597 A CN 201310223597A CN 103259277 A CN103259277 A CN 103259277A
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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
- Y02E40/30—Reactive power compensation
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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
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Abstract
The invention discloses a three-phase load unbalance compensator which comprises a current sampling device, a DSP (digital signal processor) controller, a PI (proportional-integral) controller, a photoelectric coupler and a rectification inversion circuit which are connected sequentially, wherein the current and voltage sampling device comprises four current transformers arranged on an A phase line, a B phase line, a C phase line and a neutral line N respectively; each current transformer is connected with the DSP controller; and the rectification inversion circuit comprises a three-phase four-leg inversion circuit, four inductors and a capacitor. According to the three-phase load unbalance compensator, the three-phase four-leg inversion circuit is applied to the three-phase load unbalance compensator, so that the three-phase load unbalance compensator is high in response speed and precision, can obtain a stable and fast three-phase balance control effect, and realizes comprehensive compensation for reactive power and negative sequence components of a system.
Description
Technical field
The present invention relates to a kind of threephase load unbalance compensator, belong to electric power low-voltage distribution network technical field.
Background technology
Along with socio-economic development, the use of various electrical equipment, the residential electricity consumption load heightens, be single phase system and civilian electricity uses, so distribution system threephase load energy imbalance is just very outstanding also very serious, and this not only increases line loss and distribution loss, also can cause the imbalance of circuit three-phase voltage, the quality of power supply and power supply quality are seriously influenced, also can accelerate the aging of distribution transforming simultaneously, reduce the situation of exerting oneself of distribution transforming.Existing load balancing device all is based on the mode of traditional combination switch switching inductance capacitance, and result of use is bad, and very dumb, can not reach desirable control effect at all.
The more threephase load unbalance compensator of domestic and international application is SVC(Static Var Compensator at present, Static Var Compensator) carries out phase-splitting susceptance compensation or manually carry out the way that threephase load regulates and improve the unbalanced problem of low voltage electric network threephase load, speed is slow but these ways all respond, the limitation that precision is not high does not fundamentally solve the unbalanced problem of threephase load.
Along with further developing of power electronic technology, after the theory of particularly utilizing current transformer to carry out current compensation is applied, the steady inverter that Semiconductor Converting Technology is carried out dynamic compensation has appearred progressively using.It is to be parallel on the electrical network by will directly being parallel on the electrical network or by reactor from the commutation bridge circuit.With traditional with TCR(Thyristor Controlled Reactor, thyristor-controlled reactor) compares for the SVC of representative, the governing speed of steady inverter is faster, range of operation is wideer, and adopt the content that can significantly reduce harmonic wave in the offset current after the measures such as multipleization, many level and PWM technology, reactor and capacity cell that the more important thing is the steady inverter use are littler than the reactor that uses among the SVC and electric capacity original paper, so greatly the volume of reduction means and cost.Steady inverter has so superior performance, has shown the developing direction of dynamic compensating device.
At present domestic and international research institution uses the research of steady inverter and focuses mostly in devices such as static reacance generator, active filters, is used for domestic low-voltage network threephase load unbalance compensator research seldom at steady inverter specially.
Summary of the invention
The objective of the invention is to overcome the defective of prior art and kind of an a kind of threephase load unbalance compensator is provided, the three-phase four-arm inverter circuit is applied in the threephase load unbalance compensator, reaction speed is fast, the precision height, can obtain the stable control of three-phase equilibrium fast effect, realize the comprehensive compensation of system's reactive power and negative sequence component.
The technical scheme that realizes above-mentioned purpose is:
A kind of threephase load unbalance compensator, comprise the current sampling device, the DSP(Digital Signal Processor that link to each other successively, Digital Signal Processing) controller, PI(Proportional Integral Controller, ratio-integration adjusting) controller, photoelectrical coupler and rectification inverter circuit, described current-voltage sampling device comprises that being separately positioned on A phase, B phase, C reaches four current transformers on the neutral line N mutually, and described each current transformer all links to each other with dsp controller; Described rectification inverter circuit comprises three-phase four-arm inverter circuit, four inductance and an electric capacity, described three-phase four-arm inverter circuit is made up of four brachium pontis parallel with one another, each brachium pontis is made up of two switching tube series aiding connections, the series connection intermediate connection point is each bridge output, and two ends that join of four brachium pontis parallel connections connect the input of described three-phase four-arm inverter circuit respectively; The input of described four inductance links to each other with each bridge output of described three-phase four-arm inverter circuit respectively, and the output of described four inductance links to each other with load; Described electric capacity is in parallel with each brachium pontis of described three-phase four-arm inverter circuit, and links to each other with the input of three-phase four-arm inverter circuit, wherein:
Described current sampling device is gathered the current signal of load circuit, and a current signal of the gathering described dsp controller of feeding;
Described dsp controller carries out analytical calculation to the current signal of current sampling device collection, needing to obtain the current signal of compensation, and the current signal of needs compensation is delivered to the PI controller;
Described PI controller produces pwm pulse signal according to the current signal of the needs compensation that receives, and pwm pulse signal is sent to described photoelectrical coupler;
Described photoelectrical coupler receives PWM(Pulse Width Modulation, pulse width modulation) pulse signal, and pwm pulse signal flowed to described rectification inverter circuit;
Described rectification inverter circuit drives eight switching tubes of described three-phase four-arm inverter circuit according to pwm pulse signal, each magnitude of current that need compensate mutually of output.
In the above-mentioned threephase load unbalance compensator, described switching tube is the IGBT(Insulated Gate Bipolar Transistor of band inverse parallel diode, insulated gate bipolar transistor).
The invention has the beneficial effects as follows: can the real-time measurement system load current, the output of each phase offset current of control system, the three-phase four-arm inverter circuit is applied in the threephase load unbalance compensator, reach energy balance by the meritorious exchange between the three-phase, make each phase current equilibrium of AC electric power systems, the neutral line does not have electric current substantially, simultaneously with the reactive current of system one of electric current by way of compensation, realize the function of reactive power compensation, finally realize the comprehensive compensation of system's reactive power and negative sequence component.Threephase load unbalance compensator reaction speed of the present invention is fast, and the precision height can obtain the stable control of three-phase equilibrium fast effect, can also improve the system power factor accordingly simultaneously.
Description of drawings
Fig. 1 is structured flowchart of the present invention;
Fig. 2 is partial electrical schematic diagram of the present invention.
Embodiment
In order to make those skilled in the art can understand technical scheme of the present invention better, below in conjunction with accompanying drawing its embodiment is described in detail:
See also Fig. 1, threephase load unbalance compensator of the present invention, comprise successively the current sampling device, dsp controller 1, PI controller 2, photoelectrical coupler 3 and the rectification inverter circuit 4 that link to each other, the current-voltage sampling device comprises that being separately positioned on A phase, B phase, C reaches four current transformer CT on the neutral line N mutually
1, CT
2, CT
3, CT
4, current transformer CT
1, CT
2, CT
3And CT
4All link to each other with dsp controller 1.Current sampling device is gathered the current signal of load circuit, and a current signal of the gathering dsp controller 1 of feeding; The current signal of 1 pair of current sampling device collection of dsp controller carries out analytical calculation, needing to obtain the current signal of compensation, and the current signal of needs compensation is delivered to PI controller 2; PI controller 2 produces pwm pulse signal according to the current signal of the needs compensation that receives, and pwm pulse signal is sent to photoelectrical coupler 3; Photoelectrical coupler 3 receives pwm pulse signal, and pwm pulse signal is flowed to rectification inverter circuit 4; Rectification inverter circuit 4 is according to each magnitude of current that need compensate mutually of pwm pulse signal output.What the threephase load unbalance compensator was exported is the three-phase alternating current electric energy, and general incoming transport electrical network also can be other equipment, and four output terminals A, B, C are three-phase alternating current, and N is the neutral line.
See also Fig. 2 again, rectification inverter circuit 4 comprises three-phase four-arm inverter circuit, inductance L
1, inductance L
2, inductance L
3, inductance L
4With a capacitor C 1, the three-phase four-arm inverter circuit is made up of four brachium pontis parallel with one another, comprises eight switch transistor T altogether
1～T
8, each brachium pontis is made up of two switching tube series aiding connections, and series connection intermediate connection point a, b, c, n are each bridge output, T
1, T
3, T
5, T
7The common port that is connected and T
2, T
4, T
6, T
8The common port that is connected connects the input of three-phase four-arm inverter circuit respectively, and the input of three-phase four-arm inverter circuit links to each other with photoelectrical coupler 3.Four inductance L
1, L
2, L
3, L
4Input link to each other four inductance L with each bridge output a, b, c, the n of three-phase four-arm inverter circuit respectively
1, L
2, L
3, L
4Output incoming transport electrical network, link to each other with load.Capacitor C 1 is in parallel with each brachium pontis of three-phase four-arm inverter circuit, and links to each other with the input of three-phase four-arm inverter circuit.Preferably, switching tube is the IGBT of band inverse parallel diode.The threephase load unbalance compensator is after the break-make control of IGBT switching tube, what export is voltage, need to become the magnitude of current through behind the inductance, electric power system is compensated, make bus A phase, B phase, C reach neutral line N mutually and go up the current sinusoidal symmetry, reach the purpose of compensation, simultaneously, utilize the energy storage of inductance to be used for keeping the constant of threephase load unbalance compensator dc voltage, to reach the effect of eliminating ripple current.
In the present embodiment, the control chip of dsp controller adopts the TMS320F2812 of TI company.The model of photoelectrical coupler is TLP350F.IGBT adopts the soft penetration Simx series of the Semikron 1200V/200A of company series, and this series IGBT has following characteristics: higher switching frequency, but general stable operation helps to improve the dynamic responding speed of whole device at 10kHz; Simple in structure, be convenient to install and close debugging; Switching loss and conduction loss are all less, help to improve the energy conversion efficiency of system; Be suitable for the cheap installation cost that industrial quarters is used.
Operation principle of the present invention is: current transformer CT
1, CT
2, CT
3, CT
4Gather upward current i of load circuit A phase, B phase, C phase, neutral line N respectively
Sa, i
Sb, i
Sc, i
SnCurrent signal, and a current signal of gathering passed to dsp controller 1; The current signal of 1 pair of reception of dsp controller carries out analytical calculation, needing to obtain the current signal of compensation, and the current signal of needs compensation is delivered to PI controller 2; PI controller 2 produces pwm pulse signal according to the current signal of the needs compensation that receives, and pwm pulse signal is sent to photoelectrical coupler 3; Photoelectrical coupler 3 receives pwm pulse signal, and pwm pulse signal is flowed to rectification inverter circuit 4; Rectification inverter circuit 4 drives eight IGBT switch transistor T of three-phase four-arm inverter circuit according to pwm pulse signal
1～T
8Open and turn-off, output A phase, B phase, C reach the magnitude of current i that neutral line N need compensate mutually
Ca, i
Cb, i
Cc, i
CnBehind the threephase load unbalance compensator access in parallel electrical network, flow to the A phase electric weight i of load
La=i
Sa+ i
Ca, B phase electric weight i
Lb=i
Sb+ i
Cb, C phase electric weight i
Lc=i
Sc+ i
Cc, neutral line N electric weight i
Ln=i
Sn+ i
Cn, making the every current balance of AC electric power systems, the neutral line does not have electric current substantially.
In sum, threephase load unbalance compensator of the present invention can the real-time measurement system load current, the output of each phase offset current of control system, the three-phase four-arm inverter circuit is applied in the threephase load unbalance compensator, reach energy balance by the meritorious exchange between the three-phase, make the every current balance of AC electric power systems, the neutral line does not have electric current substantially, simultaneously with the reactive current of system one of electric current by way of compensation, realize the function of reactive power compensation, finally realize the comprehensive compensation of system's reactive power and negative sequence component.Threephase load unbalance compensator structure of the present invention is comparatively flexible, stable performance, the electrical network that inserts in parallel, easy for installation, use simple, be applicable to low-voltage networks such as industrial and mineral, enterprise, traffic and transportation sector, residential block, can obtain the stable control of three-phase equilibrium fast effect, can also improve the system power factor accordingly simultaneously.And each parts of the present invention are all selected market product commonly used for use, are easy to realize.
Above embodiment is only for the usefulness that the present invention is described, but not limitation of the present invention, person skilled in the relevant technique, under the situation that does not break away from the spirit and scope of the present invention, can also make various conversion or modification, therefore all technical schemes that are equal to also should belong to category of the present invention, should be limited by each claim.
Claims (2)
1. threephase load unbalance compensator, comprise the current sampling device that links to each other successively, dsp controller, the PI controller, photoelectrical coupler and rectification inverter circuit, described current-voltage sampling device comprises and is separately positioned on the A phase, the B phase, C reaches four current transformers on the neutral line N mutually, described each current transformer all links to each other with dsp controller, it is characterized in that, described rectification inverter circuit comprises the three-phase four-arm inverter circuit, four inductance and an electric capacity, described three-phase four-arm inverter circuit is made up of four brachium pontis parallel with one another, each brachium pontis is made up of two switching tube series aiding connections, the series connection intermediate connection point is each bridge output, and two ends that join of four brachium pontis parallel connections connect the input of described three-phase four-arm inverter circuit respectively; The input of described four inductance links to each other with each bridge output of described three-phase four-arm inverter circuit respectively, and the output of described four inductance links to each other with load; Described electric capacity is in parallel with each brachium pontis of described three-phase four-arm inverter circuit, and links to each other with the input of three-phase four-arm inverter circuit, wherein:
Described current sampling device is gathered the current signal of load circuit, and a current signal of the gathering described dsp controller of feeding;
Described dsp controller carries out analytical calculation to the current signal of current sampling device collection, needing to obtain the current signal of compensation, and the current signal of needs compensation is delivered to the PI controller;
Described PI controller produces pwm pulse signal according to the current signal of the needs compensation that receives, and pwm pulse signal is sent to described photoelectrical coupler;
Described photoelectrical coupler receives pwm pulse signal, and pwm pulse signal is flowed to described rectification inverter circuit;
Described rectification inverter circuit drives eight switching tubes of described three-phase four-arm inverter circuit according to pwm pulse signal, each magnitude of current that need compensate mutually of output.
2. threephase load unbalance compensator according to claim 1 is characterized in that, described switching tube is the IGBT of band inverse parallel diode.
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| CN2013102235971A CN103259277A (en) | 2013-06-06 | 2013-06-06 | Three-phase load unbalance compensator |
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| CN2013102235971A CN103259277A (en) | 2013-06-06 | 2013-06-06 | Three-phase load unbalance compensator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103956757A (en) * | 2014-05-05 | 2014-07-30 | 广东志成冠军集团有限公司 | Compensation device for improving three-phase power imbalance of electric power system |
| CN104362655A (en) * | 2014-12-10 | 2015-02-18 | 国家电网公司 | Unbalanced load compensation device and compensation method |
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| CN202384764U (en) * | 2011-11-16 | 2012-08-15 | 安徽立卓智能电网科技有限公司 | Active electric power filter |
| CN203387194U (en) * | 2013-06-06 | 2014-01-08 | 国家电网公司 | A three-phase load unbalance compensator |
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Patent Citations (5)
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| CN101394089A (en) * | 2008-07-23 | 2009-03-25 | 国网武汉高压研究院 | Control method for three phase active electric power filter to output current wave |
| CN201717638U (en) * | 2010-05-10 | 2011-01-19 | 潍坊共业电子科技有限公司 | Static synchronous compensating device for power grid |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103956757A (en) * | 2014-05-05 | 2014-07-30 | 广东志成冠军集团有限公司 | Compensation device for improving three-phase power imbalance of electric power system |
| CN104362655A (en) * | 2014-12-10 | 2015-02-18 | 国家电网公司 | Unbalanced load compensation device and compensation method |
| CN104362655B (en) * | 2014-12-10 | 2017-10-17 | 国家电网公司 | A kind of unbalanced load compensation device and compensation method |
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Application publication date: 20130821 |