CN101447673A - Active power quality adjuster - Google Patents
Active power quality adjuster Download PDFInfo
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- CN101447673A CN101447673A CNA200810226448XA CN200810226448A CN101447673A CN 101447673 A CN101447673 A CN 101447673A CN A200810226448X A CNA200810226448X A CN A200810226448XA CN 200810226448 A CN200810226448 A CN 200810226448A CN 101447673 A CN101447673 A CN 101447673A
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- 239000000203 mixture Substances 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
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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]
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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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention relates to an active power quality adjuster, consisting of a fundamental wave compensation part and a harmonic wave compensation part, and the two parts compensate fundamental current and harmonic current respectively. An H-bridge cascade multilevel inverter and a fundamental wave connection inductance are connected in series at the fundamental wave compensation part, so that reactive compensation and unbalanced load compensation can be dynamically carried out; the H-bridge cascade multilevel inverter and a unituning passive filter are connected in series to form the harmonic wave compensation part which is connected across the two ends of the fundamental wave connection inductance. Therefore, the power quality adjuster can lower switching frequency and loss of the H-bridge cascade multilevel inverter at the fundamental wave compensation part greatly on one hand, and only a fraction of fundamental current passes the harmonic wave compensation part and the whole part only undertakes fundamental voltage of the fundamental wave connection inductance without undertaking fundamental voltage on the other hand, thereby effectively reducing the capacity of the H-bridge inverter and the withstand voltage at the harmonic wave compensation part.
Description
Technical field
The present invention relates to field of power, particularly a kind of active power quality adjuster.
Background technology
Along with the extensive use of power electronic device in industry, the harmonic pollution problem of electrical network is on the rise.Harmonic wave not only influences the operate as normal of electric equipment, brings hidden danger for the safety and economic operation of electrical network, also can produce electromagnetic interference to signal system, influences operate as normal.In electric power system, network element consume reactive power not only, most of loads are consume reactive power also.For improve power factor, reduction capacity, stablize line voltage, the purpose of compensation unbalanced load, carry out reasonable compensation with regard to needing the required reactive power of system.
Shunt active power filter (APF) and parallel connection type hybrid active filter (HAPF) are two kinds of main harmonic waves and reactive power compensation technology.Shunt active power filter can be regarded controlled current source as, can initiatively compensate harmonic wave, reactive power or the unsymmetrical current of load fast, but the switching loss of its inverter is big, and the economy of device operation is low, and power electronic device is required height.The parallel connection type hybrid active filter is to be composed in series in parallel with system by active filter and passive filter (can select single tuning, double tunning or high pass filter etc. on request).Active filter is a current-controlled voltage source, and passive filter is born fundamental voltage, effectively reduces the capacity of active filter, reduces the cost of whole device.But active filter itself will bear whole reactive currents of bucking-out system, and device is idle by capacitor compensation, can't realize dynamic passive compensation.
Be made up of the reacance generator of active filter and multiple inverter structure a kind of structure, active filter is connected the back cross-over connection in the connection inductance two ends of reacance generator by inverter with inductance.Active filter compensates harmonic current, and is in parallel with system behind the reacance generator series connection first-harmonic connection inductance of multiple inverter structure, and reactive current is compensated.Active filter is connected across first-harmonic and connects the inductance two ends.Reduced the active filter capacity so to a certain extent, but harmonic compensation adopts the inductance injection mode, the dc voltage of requirement active filter is greater than the fundamental voltage on the first-harmonic inductance, the frequency of injecting along with harmonic wave increases, harmonic wave follow-up control variation, and the harmonic current that injects can connect inductance at first-harmonic and form circulation, influences compensation effect.
In structure of the present invention, based on the thought of fundamental current and the compensation of harmonic wave solution for the current coupling, the harmonic compensation part cross-over connection that active filter and passive filtering branch road are composed in series connects the inductance two ends with first-harmonic and does not see identical or similar techniques at home and abroad as yet with the topological structure that reduces the active filter capacity.
Summary of the invention
A kind of active electric power electric energy regulator has reduced harmonic compensation active filter capacity partly by voltage and current two aspects.
Electric energy regulator of the present invention is based on the decoupling zero control of fundamental current and harmonic current, is made up of compensating fundamental wave part and harmonic wave compensated part two parts, and fundamental current and harmonic current are compensated respectively.Compensating fundamental wave partly adopts H bridge cascaded multilevel inverter and first-harmonic to connect inductance and connects, can be to idle and load unbalanced dynamic compensation; The harmonic compensation part is composed in series by the passive filter of H bridge inverter and single tuning, and cross-over connection connects the inductance two ends in first-harmonic.This sample electric energy regulator has been realized: the switching frequency and the loss that greatly reduce the H bridge cascaded multilevel inverter of compensating fundamental wave part on the one hand; Make harmonic compensation part only flow through the fraction fundamental current on the other hand, the whole first-harmonic of only bearing connects fundamental voltage on the inductance, and does not bear fundamental voltage, has effectively reduced the withstand voltage of the capacity of H bridge inverter of harmonic compensation part and harmonic wave compensated part.
In sum, new electric energy quality adjustor of the present invention,
For the harmonic compensation part:
Harmonic compensation partly is connected across first-harmonic and connects the inductance two ends, whole voltage drop of only bearing on the first-harmonic connection inductance;
The single tuning passive filter of harmonic compensation part is tuned at (for example 5 times or 7 subfrequencies) under certain harmonic frequency, to reduce reducing the dc voltage of harmonic compensation inverter partly at this frequency and near the harmonic impedance of harmonic wave under the frequency it;
The single tuning passive filter of harmonic compensation part presents absolute value and connects the anti-bigger reactance of value of inductance point than first-harmonic under fundamental frequency, bear most of first-harmonic and connect inductance L
fOn fundamental voltage.
The inverter outlet side of harmonic compensation part only bears very little a part of fundamental voltage, and this inverter only flows through the harmonic current of load generation and the compensating fundamental wave electric current of fraction;
From bearing voltage and flowing through the capacity that electric current two aspects have reduced the H bridge inverter of harmonic compensation part.
For the compensating fundamental wave part:
The fundamental frequency reactive current of compensating fundamental wave part bucking-out system.Adopt H bridge cascaded multilevel inverter, control its output voltage, export the fundamental reactive current that will compensate.Because compensating fundamental wave part uncompensation harmonic current so can reduce the switching frequency that compensating fundamental wave partly joins multi-electrical level inverter to a great extent, reduces the switching loss of switching device greatly.
Because compensating fundamental wave partly adopts single-phase cascaded multilevel inverter, with the inverter direct-flow side capacitor replace with ultracapacitor or independently DC power supply can realize load unbalanced electric current is compensated.
Simultaneously, the H bridge cascaded multilevel inverter of the part of the compensating fundamental wave among Fig. 1 also can be the three-phase half-bridge inverter when not needing to compensate load unbalanced electric current; The single tuning passive filter of harmonic compensation part also can be by high pass filter, the passive filter of the forms such as combination of C mode filter or single tuned filter and high pass filter replaces, also can there be the circuit of a LC parallel resonance (resonance is under fundamental frequency, to bear whole first-harmonic pressure drops) to replace.
Therefore the present invention proposes a kind of active power quality adjuster, comprise compensating fundamental wave part and harmonic wave compensated part, it is characterized in that described compensating fundamental wave partly adopts H bridge cascaded multilevel inverter and first-harmonic to connect inductance and connects, can be to idle and load unbalanced dynamic compensation; Described harmonic compensation part is composed in series by the passive filter of active filter and single tuning, and cross-over connection connects the inductance two ends in first-harmonic.
In the three phase mains of electric power system, each phase compensating fundamental wave is partly cascaded up by a plurality of H bridge modules and forms multi-electrical level inverter, connecting inductance with first-harmonic again connects, the harmonic compensation of each phase partly is to be composed in series by an active filter and passive filter, and cross-over connection connects the inductance two ends in first-harmonic.
Harmonic compensation partly is connected across first-harmonic and connects the inductance two ends, integral body is born the voltage on the first-harmonic connection inductance, the single tuning passive filter is series resonance under certain harmonic frequency, bear the fundamental voltage on the first-harmonic connection inductance, active filter does not bear fundamental voltage, only flow through the small part fundamental current, the reactive current of compensating fundamental wave system and load unbalanced realizes phase-splitting control.Adopt H bridge cascaded multilevel inverter, control its output voltage, control the compensating fundamental wave electric current.
Advantage of the present invention is:
(1) method of controlling based on the decoupling zero of idle and harmonic current reduces the device overall losses greatly;
(2) the H bridge inverter of harmonic compensation part only bears harmonic voltage and small part fundamental current, has reduced its capacity from voltage, electric current two aspects;
(3) harmonic compensation partly bears the voltage that first-harmonic connects inductance, has reduced the requirement withstand voltage to the harmonic compensation part;
(4) adopt concatenation technology to be convenient to modularized design and installed capacity expansion;
(5) three-phase imbalance that can bucking-out system.
Description of drawings
Fig. 1 is the main circuit structure figure according to active electric power electric energy regulator device of the present invention;
Fig. 2 is the A phase electrical schematic diagram according to active electric power electric energy regulator device of the present invention.
Embodiment
The main circuit structure of electric energy regulator of the present invention as shown in Figure 1, electric energy regulator connecting system in parallel comprises 4 two unit of harmonic compensation part 3 and compensating fundamental wave part.
Fig. 2 is the A phase electrical schematic diagram of electric energy regulator of the present invention.
Compensating fundamental wave part 4 connects inductance L by the multi-electrical level inverter 7 that the cascade of n H bridge inverter constitutes with first-harmonic
f8 are composed in series; The switching tube of inverter of forming the compensating fundamental wave part is for turn-offing a kind of in the power electronic device (insulated gate bipolar thyristor IGBT, gate level turn-off thyristor GTO etc.); Cascaded multilevel inverter in the compensating fundamental wave part is by capacitor C
DCfDirect voltage V is provided
DCf
Electric energy regulator of the present invention is based on the decoupling zero control of fundamental current and harmonic current, harmonic compensation part and compensating fundamental wave part only compensate the harmonic current that load produces, and compensating fundamental wave partly compensates reactive current and the unsymmetrical current under the fundamental frequency.
As shown in Figure 2, the voltage of the cascaded multilevel inverter output of compensating fundamental wave part is U
Q, device access point voltage is U
PCC, the impedance that first-harmonic connects inductance L f is ZL, pressure drop is U
L, the impedance of single tuning passive filter is Z
F, pressure drop is U
PF, the output voltage of the H bridge inverter of harmonic compensation part is U
AF, system power is I
S, installing total offset current is I
C, load current is I
Load, the electric current that flows through first-harmonic connection inductance is I
L, the output current of harmonic compensation part is I
F
Consider first-harmonic composition and harmonic components, establish:
U
PCC＝U
PCC_f+U
PCC_h (1)
U
Q＝U
Q_f+U
Q_h (2)
U
L＝U
L_f+U
L_h (3)
U
PF＝U
PF_f+U
PF_h (4)
U
AF＝U
AF_f+U
AF_h (5)
I
F＝I
F_f+I
F_h (6)
I
L＝I
L_f+I
L_h (7)
I
S＝I
S_f+I
S_h (8)
I
Load＝I
Load_f_P+I
Load_f_Q+I
Load_h (9)
I
C＝I
C_f+I
C_h (10)
Subscript in the above-mentioned formula " _ f " expression first-harmonic composition, " _ h " represents harmonic components, subscript " _ P " expression active component, " _ Q " represents idle composition, Hereinafter the same.
In the ideal case, establish the cascaded multilevel inverter output voltage U
QDo not contain harmonic components, perhaps can ignore, promptly
U
Q_h＝0 (11)
And system voltage is distortion not.
Load fundamental wave reactive power reactive current I
Load_f_QWith the harmonic wave electric current I
Load_hBe from load current I by checkout equipment
LoadIn extract.
Total offset current when electric energy regulator
I
C＝I
Load_f_Q+I
Load_h (12)
Then
I
S＝I
Load_f_P (13)
The system that promptly reached only exports the purpose of pure fundamental active current.
This moment is because I
SDo not contain harmonic components, the not distortion of system voltage of setting up departments, so
U
PCC_h＝0 (14)
Have by formula (11) and (14)
U
L_h＝0 (15)
Promptly
I
L_h＝0 (16)
This moment is in order to allow the single tuning passive filter bear the first-harmonic pressure drop that first-harmonic connects inductance L f, allow harmonic compensation partly flow through the fundamental current of certain amplitude, i.e. I
F_fSo have
I
F_f*Z
PF_f＝U
L_f (17)
Again
U
L_f＝Z
L_f*I
L_f (18)
Then
Get by formula (6)
I
C＝I
F+I
L＝I
F_f+I
F_h+I
L (20)
So get by formula (7), (10), (17) and (18)
I
C_h＝I
F_h (22)
Simultaneous formula (17)-(22) obtain:
Harmonic compensation partly is responsible for control and is produced offset current
Compensating fundamental wave partly is responsible for control and is produced offset current:
I
C_f＝I
Load_f_Q
Get according to formula (2)-(5), (11) and (14)-(15) and Kirchhoff's second law
U
AF＝U
AF_h＝-U
PF_h＝-I
Load_h*Z
PF_h (24)
By formula (24), the capacity of the H bridge inverter of harmonic compensation part
Obviously, through type (24) is as long as allow Z as can be seen
PF_fAbsolute value much larger than Z
L_f, both can realize reducing the capacity of the H bridge inverter of harmonic compensation part.And dull passive humorous filter 5 is tuned under certain harmonic frequency, be readily embodied in Z under the fundamental frequency
PF_fAbsolute value much larger than Z
L_fCondition.
The present invention has been described according to preferred embodiment.Obviously, reading and understanding above-mentioned detailed description postscript and can make multiple correction and replacement.What this invention is intended to is that the present invention is built into all these corrections and the replacement that has comprised within the scope that falls into the appended claims or its equivalent.
Claims (3)
1, a kind of active power quality adjuster comprises compensating fundamental wave part and harmonic wave compensated part, it is characterized in that described compensating fundamental wave partly adopts H bridge cascaded multilevel inverter and first-harmonic to connect inductance and connects, can be to idle and load unbalanced dynamic compensation; Described harmonic compensation part is composed in series by the passive filter of active filter and single tuning, and cross-over connection connects the inductance two ends in first-harmonic.
2, active power quality adjuster as claimed in claim 1, it is characterized in that in the three phase mains of electric power system, each phase compensating fundamental wave is partly cascaded up by a plurality of H bridge modules and forms multi-electrical level inverter, connecting inductance with first-harmonic again connects, the harmonic compensation of each phase partly is to be composed in series by an active filter and passive filter, and cross-over connection connects the inductance two ends in first-harmonic.
3, active power quality adjuster as claimed in claim 2, it is characterized in that harmonic compensation partly is connected across first-harmonic and connects the inductance two ends, integral body is born the voltage on the first-harmonic connection inductance, the single tuning passive filter is series resonance under certain harmonic frequency, bear the fundamental voltage on the first-harmonic connection inductance, active filter does not bear fundamental voltage, only flows through the small part fundamental current, the reactive current of compensating fundamental wave system and load unbalanced realizes phase-splitting control.Adopt H bridge cascaded multilevel inverter, control its output voltage, control the compensating fundamental wave electric current.
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| CNA200810226448XA CN101447673A (en) | 2008-11-11 | 2008-11-11 | Active power quality adjuster |
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| CNA200810226448XA CN101447673A (en) | 2008-11-11 | 2008-11-11 | Active power quality adjuster |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101916308A (en) * | 2010-07-27 | 2010-12-15 | 广州广日电气设备有限公司 | Design method and device for controller of three-phase three-wire type uniform electric energy regulator |
| CN102142786A (en) * | 2011-03-30 | 2011-08-03 | 浙江大学宁波理工学院 | Topological structure of current type multi-level inverter |
| CN102195289A (en) * | 2011-07-18 | 2011-09-21 | 华北电力大学 | Cascade-structure-based hybrid active power filter |
| CN102208810A (en) * | 2011-06-03 | 2011-10-05 | 华中科技大学 | Distributed control system for cascaded multilevel active power filter |
| CN102280880A (en) * | 2011-08-02 | 2011-12-14 | 中国电力科学研究院 | Electrical energy quality management device of electrified railway with differentiated compensation |
| WO2012010053A1 (en) * | 2010-07-22 | 2012-01-26 | 荣信电力电子股份有限公司 | Transformer-less static synchronous compensator (statcom) topological structure based on modular multilevel converter (mmc) |
| CN103606926A (en) * | 2013-11-22 | 2014-02-26 | 国家电网公司 | High-capacity unified power quality conditioner based on chain structure and control method thereof |
| CN103683297A (en) * | 2013-12-31 | 2014-03-26 | 广东志成冠军集团有限公司 | Electric energy quality integrated control circuit |
| CN103856091A (en) * | 2014-03-18 | 2014-06-11 | 电子科技大学 | Mixing cascaded multi-electric-level converter topology and control method based on T type APF |
| CN103872685A (en) * | 2014-03-11 | 2014-06-18 | 韩伟 | Harmonic current fractional frequency staggered compensation device and harmonic current fractional frequency giving algorithm thereof |
| CN104167939A (en) * | 2014-08-29 | 2014-11-26 | 北京天诚同创电气有限公司 | Method and device for modulating current transformer |
| CN104410063A (en) * | 2014-03-21 | 2015-03-11 | 南车株洲电力机车研究所有限公司 | Cascaded unified electric energy quality regulating system |
| CN104904106A (en) * | 2012-11-15 | 2015-09-09 | Abb技术有限公司 | Apparatus for filtering harmonics in railway contact lines and method |
| CN106230003A (en) * | 2016-08-22 | 2016-12-14 | 阳光电源股份有限公司 | A kind of cascade connection multi-level inversion system and modulator approach thereof and controller |
| CN106921170A (en) * | 2017-01-13 | 2017-07-04 | 国网山东省电力公司济南供电公司 | A kind of multiple-variable flow type three-phase imbalance load integrated control structure and control strategy |
| US10170913B2 (en) | 2016-11-29 | 2019-01-01 | Mitsubishi Electric Power Products, Inc. | Static synchronous compensator device and related method of phase balancing a three-phase power system |
| CN111064202A (en) * | 2018-10-17 | 2020-04-24 | 中国电力科学研究院有限公司 | Compensator and control method and system thereof |
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2008
- 2008-11-11 CN CNA200810226448XA patent/CN101447673A/en active Pending
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| WO2012010053A1 (en) * | 2010-07-22 | 2012-01-26 | 荣信电力电子股份有限公司 | Transformer-less static synchronous compensator (statcom) topological structure based on modular multilevel converter (mmc) |
| CN101916308A (en) * | 2010-07-27 | 2010-12-15 | 广州广日电气设备有限公司 | Design method and device for controller of three-phase three-wire type uniform electric energy regulator |
| CN102142786A (en) * | 2011-03-30 | 2011-08-03 | 浙江大学宁波理工学院 | Topological structure of current type multi-level inverter |
| CN102142786B (en) * | 2011-03-30 | 2013-06-05 | 浙江大学宁波理工学院 | Topological structure of current type multi-level inverter |
| CN102208810A (en) * | 2011-06-03 | 2011-10-05 | 华中科技大学 | Distributed control system for cascaded multilevel active power filter |
| CN102195289A (en) * | 2011-07-18 | 2011-09-21 | 华北电力大学 | Cascade-structure-based hybrid active power filter |
| CN102280880B (en) * | 2011-08-02 | 2014-08-27 | 中国电力科学研究院 | Electrical energy quality management device of electrified railway with differentiated compensation |
| CN102280880A (en) * | 2011-08-02 | 2011-12-14 | 中国电力科学研究院 | Electrical energy quality management device of electrified railway with differentiated compensation |
| CN104904106B (en) * | 2012-11-15 | 2018-01-02 | Abb 技术有限公司 | Apparatus and method for filtering the harmonic wave in railway contact line |
| CN104904106A (en) * | 2012-11-15 | 2015-09-09 | Abb技术有限公司 | Apparatus for filtering harmonics in railway contact lines and method |
| CN103606926A (en) * | 2013-11-22 | 2014-02-26 | 国家电网公司 | High-capacity unified power quality conditioner based on chain structure and control method thereof |
| CN103683297A (en) * | 2013-12-31 | 2014-03-26 | 广东志成冠军集团有限公司 | Electric energy quality integrated control circuit |
| CN103683297B (en) * | 2013-12-31 | 2015-10-21 | 广东志成冠军集团有限公司 | A kind of comprehensive power quality control circuit |
| CN103872685A (en) * | 2014-03-11 | 2014-06-18 | 韩伟 | Harmonic current fractional frequency staggered compensation device and harmonic current fractional frequency giving algorithm thereof |
| CN103872685B (en) * | 2014-03-11 | 2016-06-01 | 韩伟 | The staggered compensation system of a kind of harmonic current frequency division and harmonic current thereof divide frequency given algorithm |
| CN103856091A (en) * | 2014-03-18 | 2014-06-11 | 电子科技大学 | Mixing cascaded multi-electric-level converter topology and control method based on T type APF |
| CN103856091B (en) * | 2014-03-18 | 2016-06-08 | 电子科技大学 | Based on mixing cascade Multilevel Inverters topology and the control method of T-shaped APF |
| CN104410063A (en) * | 2014-03-21 | 2015-03-11 | 南车株洲电力机车研究所有限公司 | Cascaded unified electric energy quality regulating system |
| CN104410063B (en) * | 2014-03-21 | 2016-03-23 | 南车株洲电力机车研究所有限公司 | A kind of cascade connection type unifies electric energy quality regulating system |
| CN104167939B (en) * | 2014-08-29 | 2016-07-06 | 北京天诚同创电气有限公司 | Method and device for modulating current transformer |
| CN104167939A (en) * | 2014-08-29 | 2014-11-26 | 北京天诚同创电气有限公司 | Method and device for modulating current transformer |
| CN106230003A (en) * | 2016-08-22 | 2016-12-14 | 阳光电源股份有限公司 | A kind of cascade connection multi-level inversion system and modulator approach thereof and controller |
| EP3288170A1 (en) * | 2016-08-22 | 2018-02-28 | Sungrow Power Supply Co., Ltd. | Cascaded multi-level inverter system and modulation method thereof, and controller |
| US10367355B2 (en) | 2016-08-22 | 2019-07-30 | Sungrow Power Supply Co., Ltd. | Cascaded multi-level inverter system and modulation method thereof, and controller |
| CN106230003B (en) * | 2016-08-22 | 2019-08-13 | 阳光电源股份有限公司 | A kind of cascade connection multi-level inversion system and its modulator approach and controller |
| US10170913B2 (en) | 2016-11-29 | 2019-01-01 | Mitsubishi Electric Power Products, Inc. | Static synchronous compensator device and related method of phase balancing a three-phase power system |
| CN106921170A (en) * | 2017-01-13 | 2017-07-04 | 国网山东省电力公司济南供电公司 | A kind of multiple-variable flow type three-phase imbalance load integrated control structure and control strategy |
| CN106921170B (en) * | 2017-01-13 | 2019-12-10 | 国网山东省电力公司济南供电公司 | Multi-converter type three-phase unbalanced load comprehensive regulation system structure and control strategy |
| CN111064202A (en) * | 2018-10-17 | 2020-04-24 | 中国电力科学研究院有限公司 | Compensator and control method and system thereof |
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