CN105048465A - Cascaded H bridge STATCOM-based reactive power compensation and filtering device - Google Patents

Cascaded H bridge STATCOM-based reactive power compensation and filtering device Download PDF

Info

Publication number
CN105048465A
CN105048465A CN201510494221.3A CN201510494221A CN105048465A CN 105048465 A CN105048465 A CN 105048465A CN 201510494221 A CN201510494221 A CN 201510494221A CN 105048465 A CN105048465 A CN 105048465A
Authority
CN
China
Prior art keywords
cascaded
phase
statcom
bridges
omega
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201510494221.3A
Other languages
Chinese (zh)
Inventor
文接南
陶原
杜超超
黎林
周立专
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Mingyang Longyuan Power Electronics Co Ltd
Original Assignee
Guangdong Mingyang Longyuan Power Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangdong Mingyang Longyuan Power Electronics Co Ltd filed Critical Guangdong Mingyang Longyuan Power Electronics Co Ltd
Priority to CN201510494221.3A priority Critical patent/CN105048465A/en
Publication of CN105048465A publication Critical patent/CN105048465A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • Y02E40/10—Flexible AC transmission systems [FACTS]
    • 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

Landscapes

  • Inverter Devices (AREA)

Abstract

The invention discloses a cascaded H bridge STATCOM-based reactive power compensation and filtering device. The device includes a cascaded H bridge STATCOM module and a control module; the cascaded H bridge STATCOM module comprises three cascaded multilevel inverters; the cascaded multilevel inverter includes n series connected H bridge units; and each H bridge unit is provided with four switching devices T1, T2, T3 and T4 and a direct-current capacitor. With the cascaded H bridge STATCOM-based reactive power compensation and filtering device of the invention adopted, high-voltage side busbar reactive power can be continuously adjustable, and harmonic below 15th-order harmonic can be effectively filtered out; the cascaded multilevel inverters can output a large number of electric levels, and harmonic content is low, and a filtering loop is not required; with the plurality of H bridge unit series connected structures adopted, the device can assuredly expand voltage level and capacity flexibly, and therefore, the application range of a STATCOM can be greatly extended, and product competitiveness can be improved.

Description

A kind of reactive power compensation based on cascaded H-bridges STATCOM is held concurrently filter
Technical field
The present invention relates to a kind of reactive power compensation based on cascaded H-bridges STATCOM to hold concurrently filter.
Background technology
Along with modern industry and scientific and technical development, power electronic equipment is widely used, and while for mankind's creature matter civilization, also cause a large amount of harmonic injection electrical network, line voltage and current waveform are distorted, and the quality of power supply declines day by day.Traditional high-voltage fence filter is generally the passive filtration units such as FC, TSC, low voltage electric network filter popular use Active Power Filter-APF (APF) again in recent years, but these devices above, all effectively can not administer the requirement of each high order harmonic component improvement on high-voltage fence, and have amplification to low-order harmonic.
Summary of the invention
For overcoming the deficiencies in the prior art, a kind of reactive power compensation based on cascaded H-bridges STATCOM is the object of the present invention is to provide to hold concurrently filter, can idle and effective filtering high-voltage fence less than the 15 times harmonic waves of quick and continuous compensation.
The present invention is the technical scheme solving the employing of its technical problem:
Reactive power compensation based on cascaded H-bridges STATCOM is held concurrently a filter, comprises cascaded H-bridges STATCOM module and control module; Described cascaded H-bridges STATCOM module comprises three cascaded multilevel inverters, described cascaded multilevel inverter comprises the H-bridge unit of n series connection, each H-bridge unit is provided with four switching element T 1, T2, T3, T4 and DC capacitors, in parallel with DC capacitor respectively after switching element T 1, T2 and switching element T 3, T4 series connection, four switching element T 1, T2, T3, T4 are each and be connected to reverse diode, the common port of the common port of switching element T 1, T2 and switching element T 3, T4 is as the output of each H-bridge unit, and the output of multiple H-bridge unit joins end to end; Three cascaded multilevel inverters adopt wye connection, the tail output short circuit of three cascaded multilevel inverters forms neutral point N, first output is respectively as A, B, C phase output terminal, and described A, B, C phase output terminal is connected with three phase network through charging resistor, filter inductance respectively; Described control module is used for detecting the electric harmonic current of three phase network, export PWM driving pulse to cascaded H-bridges STATCOM module, cascaded H-bridges STATCOM module injects the electric current equal with original harmonic current, phase place is contrary to three phase network, makes total harmonic current of power supply be zero.
Further, the described detection to harmonic current adopts i p-i qharmonic detection, first gathers three-phase current and voltage waveform signal, if each phase current of three-phase circuit and voltage are respectively i by transducer a, i b, i cand e a, e b, e c;
Adopt PLL phase-locked loop and just, the voltage signal that collects of cosine signal generating means processes sensor, obtain and A phase line voltage e asynchronous sinusoidal signal sin ω t and corresponding cosine-cos ω t; A-b-c three-phase static coordinate system is converted into alpha-beta two-phase static vertical coordinate system by coordinate transform, a-b-c three-phase symmetrical electric current mutual deviation 120 °, the α axle of alpha-beta two-phase static vertical coordinate system is identical with a direction of principal axis in a-b-c three-phase static coordinate system, the advanced α axle of β axle 90 ° of phase angles;
Instantaneous active current i is calculated by following calculating formula pwith instantaneous reactive current i q:
i p i q = s i n ω t c o s ω t - c o s ω t - s i n ω t i α i β = CC 32 i a i b i c ;
Wherein, C = sin ω t - c o s ω t - c o s ω t - s i n ω t ;
I is drawn by LPF filtering p, i qdC component
Here by i a, i b, i cfundametal compoment i af, i bf, i cfproduce, therefore draw:
i a f i b f i c f = C 23 C i p ‾ i q ‾ ;
By i a, i b, i cwith fundametal compoment i af, i bf, i cfsubtract each other to obtain the harmonic component i of each phase ah, i bh, i ch.
Further, described cascaded multilevel inverter adopts phase-shifted SPWM technology to modulate.
Further, described control module also has error protection, remote signalling displacement reports, failure wave-recording function.
Further, described switching element T 1, T2, T3, T4 are transistor.
The invention has the beneficial effects as follows: a kind of reactive power compensation based on cascaded H-bridges STATCOM that the present invention adopts is held concurrently filter, can realize high-voltage side bus reactive power continuously adjustabe, simultaneously effective filtering less than 15 times harmonic waves; Cascaded multilevel inverter output level number is many, and harmonic content is little, no longer needs filter circuit; Multiple H-bridge unit cascaded structure assurance device expands electric pressure and capacity neatly, substantially increases the STATCOM scope of application and product competitiveness.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and example, the invention will be further described.
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of H-bridge unit of the present invention;
Fig. 3 is the modulation waveform figure of single H-bridge unit;
Fig. 4 is i p-i qthe schematic diagram of detection algorithm;
Fig. 5 is 35kV bus current oscillogram when not dropping into cascaded H-bridges STATCOM module;
Fig. 6 is harmonic current waveforms figure when not dropping into cascaded H-bridges STATCOM module;
Fig. 7 is the 35kV bus current oscillogram after dropping into cascaded H-bridges STATCOM module;
Fig. 8 is the analysis of harmonic spectrum schematic diagram before dropping into cascaded H-bridges STATCOM module;
Fig. 9 is the analysis of harmonic spectrum schematic diagram after dropping into cascaded H-bridges STATCOM module.
Embodiment
With reference to Fig. 1, Fig. 2, a kind of reactive power compensation based on cascaded H-bridges STATCOM of the present invention is held concurrently filter, comprises cascaded H-bridges STATCOM module and control module.
Described cascaded H-bridges STATCOM module comprises three cascaded multilevel inverters, described cascaded multilevel inverter comprises the H-bridge unit of n series connection, each H-bridge unit is provided with four switching element T 1, T2, T3, T4 and DC capacitors, further, described switching element T 1, T2, T3, T4 are transistor.In parallel with DC capacitor respectively after switching element T 1, T2 and switching element T 3, T4 series connection, four switching element T 1, T2, T3, T4 are each and be connected to reverse diode, the common port of the common port of switching element T 1, T2 and switching element T 3, T4 is as the output of each H-bridge unit, and the output of multiple H-bridge unit joins end to end; Three cascaded multilevel inverters adopt wye connection, the tail output short circuit of three cascaded multilevel inverters forms neutral point N, first output is respectively as A, B, C phase output terminal, and described A, B, C phase output terminal is connected with three phase network through charging resistor, filter inductance respectively.The exportable positive level of single H-bridge unit, zero level, negative level, when switching element T 1, T4 conducting, export positive level; When switching element T 2, T3 conducting, export negative level; When switching element T 1, T3 or T2, T4 conducting, export zero level, and the H-bridge unit of n series connection can realize exporting 2n+1 level.H-bridge unit is normally run and the condenser voltage of DC side must be leaned on to support, and when inverter incoming transport power supply brings into operation, forms rectifier, charge to direct current capacitor by the reverse fly-wheel diode that respectively can close device.After inverter starts normal operation, the energy storage of direct current capacitor will be used for meeting the internal loss of inverter, and capacitance voltage can decline, and must constantly make voltage remain on normal range of operation to capacitor charging complementary energy.This topological structure can realize H-bridge unit rectification and inversion two kinds of running statuses.
With reference to Fig. 3, described cascaded multilevel inverter adopts phase-shifted SPWM technology to modulate.For the single-phase cascaded multilevel inverter be made up of n H-bridge unit, each H-bridge unit adopts the SPWM modulator approach of low switching frequency, the sinusoidal modulation wave of each unit is identical, modulate respectively with n group triangular carrier, each triangular carrier has identical frequency and amplitude, but phase place differs fixing angle successively, certain angle thus the SPWM pulse making each H-bridge unit export also is staggered, considerably increase equivalent switching frequency, after superposition, the waveform that inverter finally exports is the staircase waveform of level more than, the harmonic content of output voltage can be made significantly to reduce by selecting suitable phase shift angle.
Described control module is used for detecting the electric harmonic current of three phase network, export PWM driving pulse to cascaded H-bridges STATCOM module, cascaded H-bridges STATCOM module injects the electric current equal with original harmonic current, phase place is contrary to three phase network, makes total harmonic current of power supply be zero.
Described control module also has error protection, remote signalling displacement reports, failure wave-recording function.
With reference to Fig. 4, the described detection to harmonic current adopts i p-i qharmonic detection, first gathers three-phase current and voltage waveform signal, if each phase current of three-phase circuit and voltage are respectively i by transducer a, i b, i cand e a, e b, e c;
Adopt PLL phase-locked loop and just, the voltage signal that collects of cosine signal generating means processes sensor, obtain and A phase line voltage e asynchronous sinusoidal signal sin ω t and corresponding cosine-cos ω t; A-b-c three-phase static coordinate system is converted into alpha-beta two-phase static vertical coordinate system by coordinate transform, a-b-c three-phase symmetrical electric current mutual deviation 120 °, the α axle of alpha-beta two-phase static vertical coordinate system is identical with a direction of principal axis in a-b-c three-phase static coordinate system, the advanced α axle of β axle 90 ° of phase angles;
Instantaneous active current i is calculated by following calculating formula pwith instantaneous reactive current i q:
i p i q = s i n ω t c o s ω t - c o s ω t - s i n ω t i α i β = CC 32 i a i b i c ;
Wherein, C = sin ω t - c o s ω t - c o s ω t - s i n ω t ;
I is drawn by LPF filtering p, i qdC component
Here by i a, i b, i cfundametal compoment i af, i bf, i cfproduce, therefore draw:
i a f i b f i c f = C 23 C i p ‾ i q ‾ ;
By i a, i b, i cwith fundametal compoment i af, i bf, i cfsubtract each other to obtain the harmonic component i of each phase ah, i bh, i ch.Because circuit does not have the injection of power supply voltage signal in whole calculating process, so whether supply voltage distorts all can not affect operation result, i p-i qmethod also can realize carrying out harmonic compensation and power factor correction simultaneously.
Cascaded H-bridges STATCOM module access network system parameter is: three phase network busbar voltage 35kV/50Hz, cascaded H-bridges STATCOM module is connected with 35kV bus by 10kV boosting change, nonlinear load is that the load of three-phase uncontrollable rectifier bridge band purely resistive is connected on 10kV side and cascaded H-bridges STATCOM wired in parallel, R=100 Ω, rectifier bridge inlet wire inductance L=2mH; DC voltage is 1000V.
Cascaded H-bridges STATCOM module does not drop into, and after only dropping into the uncontrollable rectifier bridge of three-phase, 35kV bus current as shown in Figure 5, and the uncontrollable rectifier bridge harmonic current of three-phase as shown in Figure 6.After cascaded H-bridges STATCOM module drops into, 35kV bus current is close to sinusoidal wave, and as shown in Figure 7, Fig. 8, Fig. 9 are analysis of harmonic spectrum before and after cascaded H-bridges STATCOM module drops into.After STATCOM devotes oneself to work, 5,7,11,13,15 subharmonic have obvious inhibition.
Cascaded H-bridges STATCOM have structure simple, be easy to the advantages such as modular implementation, each cell operation symmetry, switch load balance, use for reference Active Power Filter-APF and adopt carrier phase technology at low pressure occasion filtering harmonic principle, test proves, device of the present invention has good inhibition to the high-voltage fence occasion that harmonic content exceeds standard.
The above, just preferred embodiment of the present invention, the present invention is not limited to above-mentioned execution mode, as long as it reaches technique effect of the present invention with identical means, all should belong to protection scope of the present invention.

Claims (5)

1. to hold concurrently a filter based on the reactive power compensation of cascaded H-bridges STATCOM, it is characterized in that: comprise cascaded H-bridges STATCOM module and control module;
Described cascaded H-bridges STATCOM module comprises three cascaded multilevel inverters, described cascaded multilevel inverter comprises the H-bridge unit of n series connection, each H-bridge unit is provided with four switching element T 1, T2, T3, T4 and DC capacitors, in parallel with DC capacitor respectively after switching element T 1, T2 and switching element T 3, T4 series connection, four switching element T 1, T2, T3, T4 are each and be connected to reverse diode, the common port of the common port of switching element T 1, T2 and switching element T 3, T4 is as the output of each H-bridge unit, and the output of multiple H-bridge unit joins end to end; Three cascaded multilevel inverters adopt wye connection, the tail output short circuit of three cascaded multilevel inverters forms neutral point N, first output is respectively as A, B, C phase output terminal, and described A, B, C phase output terminal is connected with three phase network through charging resistor, filter inductance respectively;
Described control module is used for detecting the electric harmonic current of three phase network, export PWM driving pulse to cascaded H-bridges STATCOM module, cascaded H-bridges STATCOM module injects the electric current equal with original harmonic current, phase place is contrary to three phase network, makes total harmonic current of power supply be zero.
2. a kind of reactive power compensation based on cascaded H-bridges STATCOM according to claim is held concurrently filter, it is characterized in that: the described detection to harmonic current adopts i p-i qharmonic detection, first gathers three-phase current and voltage waveform signal, if each phase current of three-phase circuit and voltage are respectively i by transducer a, i b, i cand e a, e b, e c;
Adopt PLL phase-locked loop and just, the voltage signal that collects of cosine signal generating means processes sensor, obtain and A phase line voltage e asynchronous sinusoidal signal sin ω t and corresponding cosine-cos ω t; A-b-c three-phase static coordinate system is converted into alpha-beta two-phase static vertical coordinate system by coordinate transform, a-b-c three-phase symmetrical electric current mutual deviation 120 °, the α axle of alpha-beta two-phase static vertical coordinate system is identical with a direction of principal axis in a-b-c three-phase static coordinate system, the advanced α axle of β axle 90 ° of phase angles;
Instantaneous active current i is calculated by following calculating formula pwith instantaneous reactive current i q:
i p i q = s i n ω t c o s ω t - c o s ω t - s i n ω t i α i β = CC 32 i a i b i c ;
Wherein, C = sin ω t - c o s ω t - c o s ω t - s i n ω t ;
I is drawn by LPF filtering p, i qdC component
Here by i a, i b, i cfundametal compoment i af, i bf, i cfproduce, therefore draw:
i a f i b f i c f = C 23 C i p ‾ i q ‾ ;
By i a, i b, i cwith fundametal compoment i af, i bf, i cfsubtract each other to obtain the harmonic component i of each phase ah, i bh, i ch.
3. a kind of reactive power compensation based on cascaded H-bridges STATCOM according to claim 1 is held concurrently filter, it is characterized in that: described cascaded multilevel inverter adopts phase-shifted SPWM technology to modulate.
4. a kind of reactive power compensation based on cascaded H-bridges STATCOM according to claim is held concurrently filter, it is characterized in that: described control module also has error protection, remote signalling displacement reports, failure wave-recording function.
5. a kind of reactive power compensation based on cascaded H-bridges STATCOM according to claim 1 is held concurrently filter, it is characterized in that: described switching element T 1, T2, T3, T4 are transistor.
CN201510494221.3A 2015-08-12 2015-08-12 Cascaded H bridge STATCOM-based reactive power compensation and filtering device Pending CN105048465A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510494221.3A CN105048465A (en) 2015-08-12 2015-08-12 Cascaded H bridge STATCOM-based reactive power compensation and filtering device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510494221.3A CN105048465A (en) 2015-08-12 2015-08-12 Cascaded H bridge STATCOM-based reactive power compensation and filtering device

Publications (1)

Publication Number Publication Date
CN105048465A true CN105048465A (en) 2015-11-11

Family

ID=54454789

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510494221.3A Pending CN105048465A (en) 2015-08-12 2015-08-12 Cascaded H bridge STATCOM-based reactive power compensation and filtering device

Country Status (1)

Country Link
CN (1) CN105048465A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105244883A (en) * 2015-11-20 2016-01-13 国家电网公司 High-frequency filter
CN105391072A (en) * 2015-12-22 2016-03-09 中国矿业大学 Power grid voltage supporting type modularized active power filter and control algorithm
CN107611998A (en) * 2017-09-22 2018-01-19 中国南方电网有限责任公司 One kind suppresses power network subsynchronous resonance method and device based on STATCOM binary channels
CN107894543A (en) * 2017-11-14 2018-04-10 云南电网有限责任公司电力科学研究院 A kind of power distribution network parameter measuring apparatus, method and system over the ground
CN112311004A (en) * 2020-09-29 2021-02-02 广西大学 Control method of cascaded H-bridge converter under harmonic background of power grid
CN113013882A (en) * 2019-12-19 2021-06-22 北京天诚同创电气有限公司 Medium-voltage parallel active power filter and control method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090251111A1 (en) * 2008-04-07 2009-10-08 Choy Young Do Static compensator apparatus for hvdc system
CN102624002A (en) * 2011-01-28 2012-08-01 江苏华研电力科技有限公司 Reactive power compensation and filtering integrated device
CN103840474A (en) * 2014-03-04 2014-06-04 国家电网公司 Main circuit topology structure of medium-high voltage directly suspended type static synchronous reactive compensator
CN104065057A (en) * 2014-05-29 2014-09-24 浙江大学 Filtering method for direct-current side voltage of cascaded distribution static synchronous compensator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090251111A1 (en) * 2008-04-07 2009-10-08 Choy Young Do Static compensator apparatus for hvdc system
CN102624002A (en) * 2011-01-28 2012-08-01 江苏华研电力科技有限公司 Reactive power compensation and filtering integrated device
CN103840474A (en) * 2014-03-04 2014-06-04 国家电网公司 Main circuit topology structure of medium-high voltage directly suspended type static synchronous reactive compensator
CN104065057A (en) * 2014-05-29 2014-09-24 浙江大学 Filtering method for direct-current side voltage of cascaded distribution static synchronous compensator

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105244883A (en) * 2015-11-20 2016-01-13 国家电网公司 High-frequency filter
CN105391072A (en) * 2015-12-22 2016-03-09 中国矿业大学 Power grid voltage supporting type modularized active power filter and control algorithm
CN105391072B (en) * 2015-12-22 2017-11-03 中国矿业大学 A kind of control algolithm of line voltage support type modular active electric wave filter
CN107611998A (en) * 2017-09-22 2018-01-19 中国南方电网有限责任公司 One kind suppresses power network subsynchronous resonance method and device based on STATCOM binary channels
CN107894543A (en) * 2017-11-14 2018-04-10 云南电网有限责任公司电力科学研究院 A kind of power distribution network parameter measuring apparatus, method and system over the ground
CN113013882A (en) * 2019-12-19 2021-06-22 北京天诚同创电气有限公司 Medium-voltage parallel active power filter and control method
CN112311004A (en) * 2020-09-29 2021-02-02 广西大学 Control method of cascaded H-bridge converter under harmonic background of power grid

Similar Documents

Publication Publication Date Title
CN105048465A (en) Cascaded H bridge STATCOM-based reactive power compensation and filtering device
CN103227581B (en) Inverter parallel harmonic wave ring current restraining method for controlling harmonic wave droop
CN104065291B (en) There is the neutral-point voltage balance system and method for low-frequency oscillation suppression function
CN102142684B (en) High-voltage direct-hanging type scalable vector graphics (SVG) comprehensive control device and comprehensive control method
CN102195287B (en) Parallel-connection active power filter suitable for three-phase four-wire power grid system
CN102522749A (en) H-bridge cascaded active power filter and control method thereof
CN106411161B (en) Three-Phase PWM Converter and its optimal control method under the conditions of a kind of Voltage unbalance
CN102074965B (en) Device and method for reactive power compensation and harmonic suppression of grid-connected potovoltaic system
CN105680712B (en) SHEPWM control circuits, two T-shaped three level SHEPWM inverter parallel systems and its method
CN102843055A (en) Neutral-point potential balance control device and method for three-level inverter
CN102638049A (en) Direct-current bus inter-phase voltage balancing control method for chained type triangular connection STATCOM (Static Synchronous Compensator)
CN104410256A (en) Active filter system containing modular multilevel converter and control method thereof
CN102769291B (en) Active power filter based on multiphase converter structure
CN105610182A (en) Tandem type microgrid structure of island operation and power control method of structure
CN103326399A (en) Grid-connected inverter control method under unbalanced and harmonic wave power grids
CN103023358B (en) Method for calculating current reference value of three-phase four-wire grid-connected voltage source type pulse-width modulation (PWM) rectifier
CN104716656B (en) Cascading static synchronous reactive compensator topology with energy exchange unit and control method thereof
CN108390384B (en) Novel reactive compensation and harmonic treatment device
CN102437575B (en) Medium-and-high-voltage unified power quality controller (UPQC) without transformer
CN105071390B (en) Control method of H-bridge three-level active power filter and system
CN201928035U (en) High voltage linear type SVG integrated control device
CN108879718B (en) Control strategy for realizing static reactive power compensation by parallel connection of unidirectional controllable rectifiers
CN203872078U (en) N-output single-phase N+1 switch group MMC inverter
CN105337482A (en) Suppression method for output current harmonic waves of single-phase grid-connected inverter
CN203691277U (en) N-output single-phase 2N+2 switching group MMC (Modular Multilevel Converter) inverter

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20151111

RJ01 Rejection of invention patent application after publication