CN100334787C - Transformer type adjustable reactor and static reactive compensator compose of it - Google Patents
Transformer type adjustable reactor and static reactive compensator compose of it Download PDFInfo
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- CN100334787C CN100334787C CNB2004100606643A CN200410060664A CN100334787C CN 100334787 C CN100334787 C CN 100334787C CN B2004100606643 A CNB2004100606643 A CN B2004100606643A CN 200410060664 A CN200410060664 A CN 200410060664A CN 100334787 C CN100334787 C CN 100334787C
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Abstract
The present invention discloses a transformer type adjustable reactor and a static reactive compensator composed of the reactor. The adjustable reactor comprises a parallel transformer unit, a voltage source type inverter combined unit and an adjustable reactor combined unit, wherein the voltage source type inverter combined unit is formed by connecting an inverter power source with double bridge-arms and a current-limiting reactor in series, the adjustable reactor combined unit is composed of N-1 thyristor switching reactor branches, and each of the thyristor switching reactor branches is respectively formed by connecting an antiparallel thyristor Ti1 and a reactor Xi1 in series. The compensator composed of the adjustable reactor also comprises a fixed parallel capacitor unit, a measuring unit and a control unit. The adjustable reactor has high response speed, wide regulation range, favorable harmonic performance and small harmonic of output current, and the adjustable reactor can be accessed in a system for operation without designing a special filter; the static reactive compensator has the advantages of easy realization of large capacity, small harmonic pollution, high speed of dynamic response, etc.
Description
Technical field
The invention belongs to power system automatic field, be specifically related to a kind of transformer type Regulatable reactor, and the Static Var Compensator that constitutes thus.
Background technology
Safe, the stable and economic operation level of electric power system is closely related with reactive power equilibrium.For this reason, must install corresponding compensation device to solve idle deficiency and the idle superfluous problem that electric power system may occur under different running method.Conclusion is got up, and current reactive-load compensator in using and studying has following several:
Static Var Compensator (Static Var Compensator, SVC): in this class compensator, studying at present and using more is to adopt based on thyristor-controlled reactor (Thyristor Controlledreactor, TCR) SVC, it can solve the dynamic passive compensation problem of load preferably, but will produce a large amount of harmonic current injected systems in the TCR course of work, and need increase a large amount of filters, thereby increase the floor space and the cost of device for eliminating these harmonic waves.This type of Technical Reference document has: Xiao Lijun, HeBing Qing, Wu Shimin, Peng Jianzhong translates. static passive compensation device. and Changsha: publishing house of Hunan University, 1989. and N.G.Hingorani, L.Gyugyi.Understanding FACTS:Concepts and technology of flexible ac transmission systems, Chapter 5.NewYork:IEEE Press (ISBN 0-7803-3455-8), 2000.
(Controllable Shunt Reactors of TransformerType, reactive-load compensator CSRT): compare with TCR, CSRT has advantages such as harmonic current is less, power loss is lower based on the transformer type Regulatable reactor.But there is following shortcoming in CSRT: 1. during underloading in order to reduce the percent harmonic distortion of injected system electric current, have nonadjustable dead band; 2. for satisfying the harmonic wave restriction of service area internal reactance device output current, each level capacity of control winding and adjusting progression must satisfy certain relation, thereby make Design of device and realization become complicated.This type of Technical Reference document has: Tian Mingxing, encourage celebrating and inspire confidence in. and the harmonic analysis of transformer type controlled reactor and power progression calculate, Proceedings of the CSEE, 2003,23 (8): 168-171.
The circuit structure of conventional transformer type Regulatable reactor (CSRT) as shown in Figure 1, wherein, W
CBe former side's winding, direct connecting system in parallel, i
CBe the electric current (output current that is called CSRT) that flows through the former side's winding of CSRT; W
C1, W
C2..., W
CN(N is the positive integer more than or equal to 1) is secondary side's winding, T
1, T
2..., T
nAnd X
1, X
2..., X
NBe respectively the anti-parallel thyristor and the current limiting reactor that are connected in secondary side's winding, i
C1, i
C2..., i
CNBe respectively the electric current that flows through each secondary side's winding.Can reach the purpose of the whole reactor equiva lent impedance of classification smooth adjustment by the turn-on and turn-off of controlling each secondary side's winding anti-parallel thyristor.
Advanced static reacance generator (Advanced Static Var Generator, ASVG): compare with reactive-load compensation equipment based on Regulatable reactor, ASVG has that governing speed is faster, adjustable range is wider, harmonic wave output is littler, and advantage such as the idle regulating power under the undervoltage condition is stronger.But the production and the development level that are limited to power electronic device are made jumbo ASVG at present and are still had problems such as technical difficulty is big, cost height.This type of Technical Reference document has: Hanson, D, J., Woodhouse, M.L., Horwill, C., et al.STATCOM:a new era of reactive compensation.PowerEngineering Journal[see also Power Engineer], 2002,16 (3): 151-160. and Schauder, C., Gernhardt, M., Stacey, E., et al.Operation of ± 100 MVAR TVASTATCON.IEEE Transactions on Power Delivery, 1997,12 (4): 1805-1811.
Summary of the invention
The present invention is directed to prior art problems and deficiency, a kind of novel transformer type Regulatable reactor and the Static Var Compensator of formation thereof are proposed, it has fully utilized the technical characterstic of CSRT and ASVG, has the high capacity of being easy to, advantages such as harmonic pollution is little, cost performance is high, rapid dynamic response speed.
The invention provides a kind of transformer type Regulatable reactor, comprise the shunt transformer unit, it is characterized in that: it also comprises voltage source inverter assembled unit and regulative reactance assembled unit; There is N winding: W pair side, shunt transformer unit
C1～W
CN, N is the positive integer more than or equal to 1, its former and deputy side's voltage homophase, and former side is certain with each winding no-load voltage ratio of pair side; The voltage source inverter assembled unit is made of a doube bridge arm inverter and a current limiting reactor series connection, is connected on the 1st the winding W in pair side, shunt transformer unit
C1On, its output current i
VSIScope be :-I≤i
VSI≤+I; The regulative reactance assembled unit is made of N-1 thuristor throw-in and throw-off reactor branch road, and each thuristor throw-in and throw-off reactor branch road is respectively by an anti-parallel thyristor T
I1With a reactor X
I1Series connection constitutes, i=2 ..., N, this N-1 thuristor throw-in and throw-off reactor branch road is connected on the 2nd to N the winding W in pair side, shunt transformer unit respectively
C2～W
CNOn; The shunt transformer unit is used for the Regulatable reactor electrical network that inserts in parallel is reduced transformer pair side electric pressure, and the classification that the multiple secondary winding of its pair side is used to reduce each coil volume, realize electric current is regulated; The voltage source inverter assembled unit is used to produce continuously adjustable capacitive/inductance current; The regulative reactance assembled unit is used to produce the adjustable inductance current of classification.
Compensator by above-mentioned Regulatable reactor constitutes is characterized in that: it also comprises fixedly shunt capacitor unit, measuring unit and control unit; The fixing former side access in parallel electrical network of shunt capacitor unit and Regulatable reactor; Regulatable reactor provides continuously adjustable perception idle; Fixedly the shunt capacitor unit provides fixing capacitive reactive power; Measuring unit is measured the associated voltage magnitude of current; Control unit is controlled Regulatable reactor according to the measured electric current and voltage of measuring unit, make that Regulatable reactor sends idle with fixing shunt capacitor unit send idle, electrical network is carried out real-time compensation.
Compare with existing Regulatable reactor, transformer type Regulatable reactor provided by the present invention has following advantage: 1. have quicker response; 2. has wider adjustable range; 3. have better harmonic performance, output current harmonics is very little, need not to design the just directly connecting system operation of special filter; 4. transformer type Regulatable reactor provided by the present invention can also work in active filter (Active Power Filter, APF) mode, the harmonic current that the compensation load produces in the time of compensating reactive power is used for the idle and harmonic compensation such as loads such as steel plant, electric railways.
The compensator that is made of transformer type Regulatable reactor provided by the invention is compared with existing reactive power compensation technology and is had the following advantages:
1, realizes high capacity easily.The adjusting winding of transformer type Regulatable reactor provided by the invention has adopted VSI (switching device of VSI adopts GTO, IGBT etc.) to control, and other control windings all adopt anti-parallel thyristor control.Current situation according to present power electronic device, the high capacity of novel compensator mainly is subjected to the restriction of VSI, because in reactive-load compensator provided by the invention, the rated capacity of VSI only accounts for the very little part of whole compensator rated capacity, therefore, realize the high capacity of whole reactive power compensator easily, thereby satisfy jumbo reactive power compensation requirement.
2, harmonic pollution is little.Based on following factor, the harmonic pollution of reactive-load compensator provided by the invention is very little.Usually can think that being in the disconnected winding of full conducting or complete shut-down can not produce harmonic pollution to system; The harmonic content of VSI output current is much smaller than the harmonic content of TCR output current, simultaneously because the VSI capacity in the novel transformer formula Static Var Compensator is less relatively, so the harmonic current of its generation shared ratio in whole compensator output current is very little; In addition, the loss of VSI shared ratio in whole device is also less, therefore can also adopt higher switching frequency further to reduce the harmonic wave in its output current.
3, rapid dynamic response speed.When reactive load changed, transformer type Static Var Compensator of the present invention only needed half cycle to cycle time just can to change by load-responsive, realizes compensation fast.
4, this invention combines the technical characterstic of CSRT and ASVG, overcome that traditional shunt reactor/capacitor response speed is slow, continuous controllable is poor, SVC output current harmonics distortion based on TCR is big, be subjected to loading condition restriction, design and realize complicatedly based on the reactive-load compensator working region of conventional CSRT, and ASVG cost height, be difficult to shortcoming such as high capacity.Therefore, the present invention has high cost performance.
Description of drawings
Fig. 1 is the electrical block diagram of conventional transformer formula Regulatable reactor;
Fig. 2 is the electrical block diagram of transformer type Regulatable reactor provided by the invention;
Fig. 3 is the electrical block diagram by the improved a kind of transformer type Regulatable reactor of Fig. 2;
Fig. 4 is the structural representation of the compensator that is made of reactor shown in Figure 2;
Fig. 5 is the structural representation of the compensator that is made of reactor shown in Figure 3.
Embodiment
As shown in Figure 2, transformer type Regulatable reactor of the present invention comprises three parts: shunt transformer unit 1, voltage source inverter (Voltage Source Inverter, VSI) assembled unit 2 and Regulatable reactor assembled unit 3.There is N winding: W 1 pair side, shunt transformer unit
C1～W
CNVSI assembled unit 2 is by a doube bridge arm inverter 2.1 and a current limiting reactor X
1Series connection constitutes, and is connected on the 1st the winding W in 1 pair side, shunt transformer unit
C1On; (each TSR branch road is respectively by an anti-parallel thyristor T for Thyristor Switched Reactor, TSR) branch road 3.2～3.N formation by (N-1) individual thuristor throw-in and throw-off reactor for Regulatable reactor assembled unit 3
I1(i=2... is N) with a reactor X
I1(i=2..., N) series connection constitutes, and this (N-1) individual TSR branch road is connected on 1 pair side the 2nd, shunt transformer unit respectively to N winding W
C2～W
CNOn.
Each unit major function is: shunt transformer unit 1 is used for the Regulatable reactor electrical network that inserts in parallel is reduced transformer pair side electric pressure, and the multiple secondary winding of its pair side can reduce each coil volume, realize the classification adjusting of electric current; VSI assembled unit 2 is used to produce continuously adjustable capacitive/inductance current; Regulatable reactor assembled unit 3 is used to produce the inductance current of classification adjustable (discontinuous).
Transformer type Regulatable reactor of the present invention has following characteristics:
Design shunt transformer unit 1 former pair side voltage homophase, and each winding no-load voltage ratio of former pair side is certain, is k: 1, transformer voltage ratio value k can be according to the actual needs of system in [0.5,500] interior value; Design VSI assembled unit 2 output current i
VSIScope be that [I ,+I] (wherein negative sign is represented i
VSIBe ahead of former side's voltage v, i.e. capacitive with 90 °; I represented in positive sign
VSILag behind former side's voltage v with 90 °, i.e. perception; As follows), current value I can be determined (its value can from several amperes to last kiloampere) according to the actual needs of system, like this this winding send idle can be at [Q
1,+Q
1] (idle value Q
1Can directly determine according to pair side's winding voltage and current value I) the interior adjusting continuously of scope, so this winding is called the adjusting winding again; In control, set T
I1(i=2 ..., N) or full conducting, perhaps complete shut-down is disconnected, promptly flows through 1 pair side, shunt transformer unit the 2nd current i to N winding
C2～i
CNPerhaps being rated value, perhaps is 0; Design suitable reactor X
I1(i=2 ..., value N) makes i
C2=+2I, i
C3=+4I ..., i
CN=+2
N-1I, promptly each coil volume ratio is Q
1: Q
2: ...: Q
N=1: 2: ...: 2
N-1On the basis of above design, by to VSI assembled unit 2.1 and T
I1(total current that flows through shunt transformer unit 1 secondary side's winding can be in that [I+ (2 for i=2..., control N)
N-1) I] the interior variation continuously of scope, so shunt transformer unit 1 former side's winding current can be in [I/k ,+(2
N-1) I/k] between change continuously, promptly this Regulatable reactor can outwards be sent continuously adjustable reactive current (mainly being perception).
As shown in Figure 3, improve the another kind of transformer type Regulatable reactor that obtains, comprise three parts: shunt transformer unit 1, VSI assembled unit 2 and regulative reactance-electric capacity assembled unit 4 according to transformer type Regulatable reactor shown in Figure 2.The structure of shunt transformer unit 1 and VSI assembled unit 2 is the same, and main improvement is to adopt regulative reactance-electric capacity assembled unit 4 to replace regulative reactance assembled unit 3; Regulative reactance-electric capacity assembled unit 4 is by TSR branch road and thyristor switchable capacitor (Thyristor Switched Capacitor, TSC) branch road is in parallel constitutes, and regulative reactance-electric capacity assembled unit 4 is used to produce capacitive/inductance current of classification adjustable (discontinuous).TSC props up route anti-parallel thyristor T
I2(i=2..., N), capacitor C
i(i=2..., N) and damping reactor X
I2(i=2... N) is in series, the impulse current of circuit when the effect of damping reactor is to reduce capacitor input or fault.
Above-mentioned transformer type Regulatable reactor has following characteristics:
Design shunt transformer unit 1 former pair side voltage homophase, and each winding no-load voltage ratio of former pair side is certain, is k: 1; Design VSI assembled unit 2 output current i
VSIOutput current scope be [I+I]; In control, set T
Ij(i=2 ..., N; J=1,2) or full conducting, perhaps complete shut-down is disconnected, and promptly 1 pair side the 2nd, shunt transformer unit is to N winding current i
C2～i
CNPerhaps being rated value, perhaps is 0; Design suitable reactor X
I1(i=2 ..., N) with capacitor C
i(i=2 ..., value N) makes i
C2=± 2I, i
C3=± 4I ..., i
CN=± 2
N-1I.On the basis of above design, by to VSI assembled unit 2.1 and T
Ij(i=2 ..., N; J=1,2) control, the electric current of shunt transformer unit 1 secondary side's winding can be [(2
N-1) I ,+(2
N-1) I] the interior variation continuously of scope, so shunt transformer unit 1 former side's winding current can be [(2
N-1) I/K ,+(2
N-1) I/K] the interior variation continuously of scope, promptly this Regulatable reactor can outwards be sent continuously adjustable capacitive/perceptual reactive current.
The structure of the compensator that constitutes by reactor shown in Figure 2 as shown in Figure 4, comprise four unit: Regulatable reactor 5, fixedly (Fixed Capacitor, FC) unit 6, measuring unit 7 and control unit 8 for shunt capacitor.Each unit major function is: Regulatable reactor 5 provides continuously adjustable perception idle; FC unit 6 provides fixing capacitive reactive power; Measuring unit 7 is measured the associated voltage magnitude of current; Control unit 8 is controlled Regulatable reactor 5 according to measuring unit 7 measured electric current and voltages, thus make that Regulatable reactor 5 sends idlely idle electrical network is carried out real-time compensation with what FC unit 6 sent.
The operation principle of above-mentioned compensator is as follows:
Former side's winding of Regulatable reactor 5 is with FC unit 6 connecting systems in parallel.The setting of Regulatable reactor 5 a secondary side N winding as previously mentioned, promptly each coil volume ratio is Q
1: Q
2: ...: Q
N=1: 2: ...: 2
N-1By the output current of control VSI, regulate that winding sends idle can be at-Q
1～+Q
1Between regulate continuously; It is idle or be 0 that remaining (N-1) individual pair side winding sends, or be Q
n(n=2,3 ..., N).Therefore, the equivalent reactance with novel transformer formula Regulatable reactor of N control winding can realize 2
NThe continuous smooth adjustment of fraction level.
With the novel Static Var Compensator of Regulatable reactor formula with four control windings is example, the required reactive power compensation scope of supposing the system is-and Q (capacitive)～+ Q (perception), the rated capacity that FC then is set is
, the rated capacity of four control windings is respectively:
And Q; Like this, load-Q～+ when changing between the Q, the variation that this novel transformer formula Static Var Compensator just can the dynamic tracking reactive load, the full compensation of realization reactive load.
Also can constitute a kind of Static Var Compensator by novel transformer formula Regulatable reactor shown in Figure 3, its structure as shown in Figure 5.It is made of three unit: regulative reactance-capacitor 9; Measuring unit 7; Control unit 8; Each cellular construction is the same.
Each unit major function is: regulative reactance-capacitor 9 provides continuously adjustable perception/capacitive reactive power; Measuring unit 7 is measured the associated voltage magnitude of current; Control unit 8 is controlled regulative reactance-capacitor 9 according to measuring unit 7 measured electric current and voltages, thereby makes idle that regulative reactance-capacitor 9 sends to carry out real-time compensation to electrical network.
The operation principle of above-mentioned compensator is as follows:
Former side's winding of regulative reactance-capacitor 9 connecting system in parallel.The rated capacity ratio of regulative reactance-capacitor 9 secondary side N control windings can be set at Q
1: Q
L2: ...: Q
LN=1: 2: ...: 2
N-1And Q
1: Q
C2: ...: Q
CN=1: 2: ...: 2
N-1, also can require to do respectively corresponding the setting according to the actual compensation of system.The structure and the operation principle of measuring unit 7 and control unit 8 are the same.
Just can be by perception/capacitive reactive power that adjusting regulative reactance-capacitor 9 is sent to the idle dynamic compensation that carries out of system.The Static Var Compensator that have four control windings with a pair side are example, the required reactive power compensation scope of supposing the system is-and Q～+ Q, four coil volume then are set are respectively:
Claims (5)
1, a kind of transformer type Regulatable reactor comprises the shunt transformer unit, it is characterized in that: it also comprises voltage source inverter assembled unit (2) and regulative reactance assembled unit (3); There is N winding: W pair side, shunt transformer unit (1)
C1～W
CN, N is the positive integer more than or equal to 1, its former and deputy side's voltage homophase, and former side is certain with each winding no-load voltage ratio of pair side; Voltage source inverter assembled unit (2) is by a doube bridge arm inverter (2.1) and a current limiting reactor (X
1) the series connection formation, be connected on the 1st the winding W in pair side, shunt transformer unit (1)
C1On, its output current i
VSIScope be :-I≤i
VSI≤+I, current value I is determined according to the actual needs of system; (3.2～3.N) constitute regulative reactance assembled unit (3), and each thuristor throw-in and throw-off reactor branch road is respectively by an anti-parallel thyristor T by N-1 thuristor throw-in and throw-off reactor branch road
I1With a reactor X
I1Series connection constitutes, i=2 ..., N, this N-1 thuristor throw-in and throw-off reactor branch road is connected on the 2nd to N the winding W in pair side, shunt transformer unit (1) respectively
C2～W
CNOn; Shunt transformer unit (1) is used for the Regulatable reactor electrical network that inserts in parallel is reduced transformer pair side electric pressure, and the classification that the multiple secondary winding of its pair side is used to reduce each coil volume, realize electric current is regulated; Voltage source inverter assembled unit (2) is used to produce continuously adjustable capacitive/inductance current; Regulative reactance assembled unit (3) is used to produce the adjustable inductance current of classification.
2, Regulatable reactor according to claim 1 is characterized in that: above-mentioned each thuristor throw-in and throw-off reactor branch road (all is parallel with the thyristor switchable capacitor branch road, is used to produce the adjustable capacitive/inductance current of classification on 3.2～3.N); Above-mentioned each thyristor switchable capacitor props up route anti-parallel thyristor T
I2, capacitor C
iAnd damping reactor X
I2Be in series, i=2 wherein ..., N.
3, the compensator that is made of the described Regulatable reactor of claim 1 is characterized in that: it also comprises fixedly shunt capacitor unit (6), measuring unit (7) and control unit (8); The fixing former side access in parallel electrical network of shunt capacitor unit (6) and Regulatable reactor (5); Regulatable reactor (5) provides continuously adjustable perception idle; Fixedly shunt capacitor unit (6) provide fixing capacitive reactive power; Measuring unit (7) is measured the associated voltage magnitude of current; Control unit (8) is controlled Regulatable reactor (5) according to the measured electric current and voltage of measuring unit (7), make that Regulatable reactor (5) sends idle with fixedly shunt capacitor unit (6) send idle, electrical network is carried out real-time compensation.
4, compensator according to claim 3 is characterized in that: measuring unit (7) comprises voltage measurement unit (7.1), load current measuring unit (7.2), voltage source inverter current measuring unit (7.3) and signal gathering unit (7.4); Voltage measurement unit (7.1) is used for measuring load bus voltage v in load side; Load current measuring unit (7.2) is used for measuring load current i in load side
LVoltage source inverter current measuring unit (7.3) is used for measurement voltage source type inverter output current i on the voltage source inverter output circuit
VSISignal gathering unit (7.4) is used for the aforementioned voltage and current signal that records is gathered, and supplies with control unit (8) and uses.
5, according to claim 3 or 4 described compensators, it is characterized in that: control unit (8) comprises that reactive current calculating unit (8.1), reactive current allocation units (8.2), pulse generator unit (8.3), voltage source inverter are with reference to output current unit (8.4) and hysteresis current control unit (8.5); Wherein, reactive current is calculated unit (8.1) according to load bus voltage v and load current i
LCalculate the amplitude of idle component in the load current, and the attribute of this idle component is discerned; Reactive current allocation units (8.2) are assigned to it in each control winding according to the amplitude of reactive current and attribute and go, and with the conducting or the shutoff of each anti-parallel thyristor in the decision control winding, and provide amplitude and the attribute of regulating winding output reference current; Pulse generator unit (8.3) is used to produce the trigger impulse of thyristor; Voltage source inverter is with reference to output current unit (8.4) reference quantity according to the reference current amplitude of calculating gained and attribute and load bus voltage v generation voltage source inverter output current; Voltage source inverter output current reference quantity and voltage source inverter output current actual value that hysteresis current control unit (8.5) is exported with reference to output current unit (8.4) according to voltage source inverter provide required pwm pulse signal to voltage source inverter.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100392553C (en) * | 2005-09-13 | 2008-06-04 | 中国电力科学研究院 | Method for regulating static var compensator of electricity transmission system |
| CN101013625B (en) * | 2006-12-21 | 2010-09-22 | 中国科学院电工研究所 | Current-limiting reactor of electric power |
| BR112013013160A2 (en) * | 2010-12-01 | 2016-08-23 | Abb Technology Ag | reactive power compensator, computer programs and computer program products |
| CN102110986B (en) * | 2011-03-21 | 2013-08-07 | 山西广福工程技术有限公司 | Reactive power compensation device for traction substation in electrified railway |
| ES2942489T3 (en) * | 2017-01-13 | 2023-06-01 | General Electric Technology Gmbh | Reactive power compensation arrangement |
| US11159021B2 (en) | 2017-05-02 | 2021-10-26 | Siemens Energy Global GmbH & Co. KG | Flexible reactive power compensation |
| CN109586260A (en) * | 2018-10-30 | 2019-04-05 | 华北电力大学 | A kind of resistance sense type capacitor commutation blended learning and its control method |
| US11152787B2 (en) | 2020-01-10 | 2021-10-19 | General Electric Company | System of modular reactive power compensators |
| CN111404172B (en) * | 2020-03-30 | 2022-06-24 | 杭州银湖电气设备有限公司 | Mixed type dynamic reactive power compensation system and method based on high-impedance transformer |
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| JPH0937468A (en) * | 1995-07-17 | 1997-02-07 | Nissin Electric Co Ltd | Static reactive power compensator |
| US5949221A (en) * | 1998-05-21 | 1999-09-07 | Siemens Westinghouse Power Corporation | Line powered, primary side connected apparatus injecting voltage compensation into an electric power line using one transformer |
| CN1455486A (en) * | 2003-06-05 | 2003-11-12 | 华中科技大学 | High-capacity controllable reactor |
| CN2739860Y (en) * | 2004-07-31 | 2005-11-09 | 华中科技大学 | Transformer type adjustable reactor and static reactive compensator comprising same |
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2004
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| JPH0937468A (en) * | 1995-07-17 | 1997-02-07 | Nissin Electric Co Ltd | Static reactive power compensator |
| US5949221A (en) * | 1998-05-21 | 1999-09-07 | Siemens Westinghouse Power Corporation | Line powered, primary side connected apparatus injecting voltage compensation into an electric power line using one transformer |
| CN1455486A (en) * | 2003-06-05 | 2003-11-12 | 华中科技大学 | High-capacity controllable reactor |
| CN2739860Y (en) * | 2004-07-31 | 2005-11-09 | 华中科技大学 | Transformer type adjustable reactor and static reactive compensator comprising same |
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