CN203039365U - Interline power flow controller based on modularized multi-level transverter - Google Patents

Interline power flow controller based on modularized multi-level transverter Download PDF

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CN203039365U
CN203039365U CN2012203748326U CN201220374832U CN203039365U CN 203039365 U CN203039365 U CN 203039365U CN 2012203748326 U CN2012203748326 U CN 2012203748326U CN 201220374832 U CN201220374832 U CN 201220374832U CN 203039365 U CN203039365 U CN 203039365U
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converter
series
line
flow controller
parallel
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王轩
喻劲松
闫殳裔
李欣
武守远
张宇
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State Grid Corp of China SGCC
Shanghai Municipal Electric Power Co
China EPRI Science and Technology Co Ltd
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State Grid Corp of China SGCC
Shanghai Municipal Electric Power Co
China EPRI Science and Technology Co Ltd
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    • 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
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Abstract

本实用新型涉及一种基于模块化多电平换流器结构的线间潮流控制器。线间潮流控制器包括静止同步补偿器（1）和静止同步串联补偿器（2）；静止同步补偿器（1）包括第一换流器（7）和并联变压器（8）；静止同步串联补偿器（2）包括第二换流器（9）和串联变压器（10）；第一换流器（7）通过并联变压器（8）并联接入输电线路I中；第二换流器（9）通过串联变压器（10）串联接入输电线路II中；统一潮流控制器包括旁路开关（4）；所述旁路开关（4）与所述串联变压器（10）并联。该线间潮流控制器规避了器件串联的技术难点，便于分相控制和模块化设计；通过冗余技术可旁路故障单元，提高装置运行可靠性；且器件开关频率低，装置运行损耗小。

Figure 201220374832

The utility model relates to an inter-line power flow controller based on a modular multilevel converter structure. The line-to-line power flow controller includes a static synchronous compensator (1) and a static synchronous series compensator (2); the static synchronous compensator (1) includes a first converter (7) and a parallel transformer (8); the static synchronous series compensator The converter (2) includes a second converter (9) and a series transformer (10); the first converter (7) is connected in parallel to the transmission line I through a parallel transformer (8); the second converter (9) The series transformer (10) is connected in series to the transmission line II; the unified power flow controller includes a bypass switch (4); and the bypass switch (4) is connected in parallel with the series transformer (10). The line-to-line power flow controller avoids the technical difficulties of connecting devices in series, and is convenient for phase separation control and modular design; the faulty unit can be bypassed through redundant technology to improve the reliability of device operation; and the switching frequency of devices is low, and the device operation loss is small.

Figure 201220374832

Description

A kind of based on flow controller between the line of modularization multi-level converter structure
Technical field
The utility model relates to flow controller between the line in a kind of flexible ac transmission field, is specifically related to a kind of based on flow controller between the line of modularization multi-level converter structure.
Background technology
Flow controller between line (IPFC) is that later development and the modern control technology of power application electronic technology realizes the parameter and the flexible of network configuration that exchange multi-thread transmission system are controlled fast.Its feature is exactly that its flexibility can adapt to the requirement that complication system carries out a series of compensation and trend control.It can finish independently comprehensive compensation of single circuit, the transmission of can also gaining merit between a plurality of circuits.
The IPFC device can be regarded as a STATCOM (STATCOM) device and constitutes at DC side parallel with a Static Series Synchronous Compensator (SSSC) device, it can be simultaneously and fast, active power and reactive power in the different circuits of independent control, thereby make IPFC have the four quadrant running function that STATCOM, SSSC device do not possess.
IPFC device main circuit topology is based on the mode of two voltage source converters (VSC) DC side parallel, wherein an AC side of converter is direct or in parallel with circuit in the system by transformer, and another AC side of converter is connected with another circuit in the system by transformer.Each voltage source converter is usually based on two level or three level three-phase voltage source converter structures.
Among the big capacity IPFC, voltage source converter improves the voltage endurance capability of device usually based on the mode that can turn-off power electronic device (typical device such as insulated gate bipolar transistor IGBT) series connection.The technological difficulties of turn-off device IGBT series connection mainly show: be subjected to the influence of technical monopoly, the IGBT device with self limiting short-circuit current characteristic is difficult to buying, and it is not deep enough that the control technology of IGBT series average-voltage is studied in theory.Be to reduce the device output harmonic wave, need be based on higher switching frequency, thereby the device running wastage is bigger, these have limited the application of big capacity IPFC.
The utility model content
At the deficiencies in the prior art, it is a kind of based on flow controller between the line of modularization multi-level converter structure that the utility model provides, flow controller has been evaded the technological difficulties of device series connection between this line, has following characteristics: be convenient to phase-splitting control and modularized design; But by redundant technique bypass trouble unit, improve the device operational reliability; And the devices switch frequency is low, and the device running wastage is little.
The purpose of this utility model is based on the following technical proposals realization:
A kind of based on flow controller between the line of modularization multi-level converter structure, its improvements are that flow controller comprises STATCOM 1 and Static Series Synchronous Compensator 2 between described line;
Described STATCOM 1 comprises first converter 7 and shunt transformer 8;
Described Static Series Synchronous Compensator 2 comprises second converter 9 and series transformer 10;
Described first converter 7 is by shunt transformer 8 in parallel accesses among the transmission line I; Described second converter 9 inserts among the transmission line II by series transformer 10 series connection.
Wherein, support electric capacity 3 is set between described STATCOM 1 and described Static Series Synchronous Compensator 2; Described support electric capacity 3 is in parallel with described STATCOM 1 and described Static Series Synchronous Compensator 2 respectively.
Wherein, described STATCOM 1 comprises first start-up circuit 5; Described first start-up circuit 5 is connected with the secondary of described shunt transformer 8, and the former limit of described shunt transformer 8 is in parallel with transmission line I.
Wherein, described first start-up circuit 5 comprises parallel resistor and switch.
Wherein, described Static Series Synchronous Compensator 2 comprises second start-up circuit 6; Described second start-up circuit, 6 one ends are connected with described second converter 9; Described second start-up circuit, 6 other ends are connected with described series transformer 10.
Wherein, described second start-up circuit 6 comprises parallel resistor and switch.
Wherein, described series transformer 10 connects among the load series connection access transmission line II.
Wherein, described first converter 7 is made of six brachium pontis of three-phase, and each brachium pontis comprises a reactor and N the submodule that structure is identical; An end is connected with described first start-up circuit 5 by reactor after the submodule cascade of each brachium pontis; Submodule one end of the cascade of two brachium pontis of the other end and other is connected, and forms the both positive and negative polarity bus of described first converter 7; Or
Described first converter 7 is made of six brachium pontis of three-phase, and each brachium pontis comprises a reactor and N the submodule that structure is identical; An end is connected with described first start-up circuit 5 after the submodule cascade of each brachium pontis, is connected with other reactor of two brachium pontis behind the other end series reactor, forms described first converter, 7 both positive and negative polarity buses.
Wherein, described second converter 9 is made of six brachium pontis of 3 phases, and each brachium pontis comprises 1 reactor and M the submodule that structure is identical; An end is connected with described series transformer 10 by reactor after the submodule cascade of each brachium pontis; Submodule one end of the cascade of two brachium pontis of the other end and other is connected, and forms described second converter, 9 both positive and negative polarity buses, is connected with the both positive and negative polarity bus of described first converter 7; Or
Described second converter 9 is made of six brachium pontis of 3 phases, and each brachium pontis comprises 1 reactor and M the submodule that structure is identical; An end is connected with described series transformer 10 after the submodule cascade of each brachium pontis; Be connected with other reactor of two brachium pontis behind the other end series reactor, form described second converter, 9 both positive and negative polarity buses, be connected with the both positive and negative polarity bus of described first converter 7.
Wherein, described submodule constitutes by half-bridge structure is in parallel with dc capacitor, and described half-bridge structure comprises the IGBT module of two series connection, and each IGBT module comprises antiparallel IGBT and diode;
Submodule bypass circuit in parallel between described half-bridge structure mid point and the IGBT emitter;
Described dc capacitor can power supply provides power supply for the control circuit of submodule by getting.
Compared with the prior art, the beneficial effect that reaches of the utility model is:
1, the utility model provide based on flow controller between the line of modularization multi-level converter structure, can significantly improve installed capacity, need not the IGBT device serial connection technology based on complexity;
2, the utility model provide based on flow controller between the line of modularization multi-level converter structure, can realize phase-splitting control;
3, the utility model provide based on flow controller between the line of modularization multi-level converter structure, can realize modularized design;
4, the utility model provide based on flow controller between the line of modularization multi-level converter structure, but by redundant technique bypass trouble unit, improve the device operational reliability, avoided device to withdraw from frequently and drop into;
5, the utility model provide based on flow controller between the line of modularization multi-level converter structure, be to reduce output harmonic wave, IGBT device tandem plan switching frequency is higher usually, the device loss is bigger; This programme is based on the modular multilevel technology, and the switching frequency of each device is lower, but can realize that external equivalent switching frequency is very high, reduces output harmonic wave, and it is less therefore to install running wastage.
Description of drawings
Fig. 1 be the utility model provide based on flow controller basic circuit structure figure between the line of modularization multi-level converter structure;
Fig. 2 is the structure chart based on flow controller main circuit scheme one between the line of modularization multi-level converter structure that the utility model provides;
Fig. 3 is the structure chart based on flow controller main circuit scheme two between the line of modularization multi-level converter structure that the utility model provides;
Fig. 4 is the structure chart based on flow controller submodule between the line of modularization multi-level converter structure that the utility model provides.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail.
The utility model provide based on flow controller basic circuit structure figure between the line of modularization multi-level converter structure as shown in Figure 1, comprise STATCOM 1 and Static Series Synchronous Compensator 2; STATCOM 1 comprises first converter 7 and shunt transformer 8; Static Series Synchronous Compensator 2 comprises second converter 9 and series transformer 10; First converter 7 is by shunt transformer 8 in parallel accesses among the transmission line I; Described second converter 9 inserts among the transmission line II by series transformer 10 series connection.
Embodiment 1
Present embodiment provides a kind of reversible type static compensator based on the modularization multi-level converter structure comprises STATCOM 1 and Static Series Synchronous Compensator 2 as shown in Figure 2; STATCOM 1 comprises first converter 7 and shunt transformer 8; Static Series Synchronous Compensator 2 comprises second converter 9 and series transformer 10;
First converter 7 is made of three-phase six brachium pontis, and six brachium pontis structures are identical, and each brachium pontis comprises that 1 reactor and N(N are natural number) submodule that individual structure is identical; Be connected with described first start-up circuit 5 by reactor after the described submodule cascade; Concrete, the half-bridge structure mid point of submodule and following pipe IGBT emitter are respectively as the submodule exit, successively with the module cascade of front and back, connect with a reactor again and constitute 1 brachium pontis, two brachium pontis series connection up and down, constitute 1 phase current converter, 3 phase current converters are whole in parallel, and draw first converter, 7 positive and negative busbars.The upper and lower bridge arm midpoint namely inserts transmission line I with first start-up circuit, 5 backs in parallel as the output of STATCOM behind the submodule series reactor.First start-up circuit 5 comprises parallel resistor and switch.
Second converter 9 is identical with first converter, 7 structures, is made of three-phase six brachium pontis, and each brachium pontis comprises that 1 reactor and M(M are natural number, and M can equal N, also can be not equal to N) submodule that individual structure is identical; Be connected with load by reactor, series transformer 10 backs after the submodule cascade.The positive and negative busbar of the positive and negative busbar of first converter 7 and second converter 9 is corresponding to be connected.The submodule of present embodiment is connected with system by reactor, can suppress on the one hand thunder and lightning, operation ripple from electrical network to the infringement of equipment, can suppress the current converter output harmonic wave on the other hand.
Series transformer 10 connects the load series connection and inserts among the transmission line II.
Preferably, present embodiment arranges between described STATCOM 1 and described Static Series Synchronous Compensator 2 and supports electric capacity 3; The electric capacity 3 that supports in parallel between the positive and negative busbar of the positive and negative busbar of first converter 7 and second converter 9.Two current converters link to each other by the intermediate dc link that is made of support electric capacity 3, and active power can be carried out bi-directional between two current converters like this; Reactive power can exchange side at it by each current converter and exchange with system independently.
Preferably, the secondary of the shunt transformer 8 of the STATCOM 1 of present embodiment is connected with first start-up circuit 5, and the former limit of shunt transformer 8 is in parallel to be inserted among the transmission line I.Shunt transformer 8 is used for realizing the coupling of line voltage and STATCOM output voltage.
Preferably, the Static Series Synchronous Compensator 2 of present embodiment can also comprise that second start-up circuit, 6, the second start-up circuits 6 are made up of parallel resistor and switch.Second start-up circuit, 6 one ends are connected with second converter 9, and the other end is connected with series transformer 10 1 ends, and the series connection of series transformer 10 other ends inserts among the transmission line II.Second start-up circuit 6 can be realized 9 smooth startings of second converter.Series transformer 10 is used for realizing the coupling of line voltage and Static Series Synchronous Compensator output voltage.
Preferably, the THE UPFC of present embodiment also is provided with by-pass switch 4 for the safety setting, and by-pass switch 4 is in parallel with series transformer 10, is used for realizing withdrawing from of Static Series Synchronous Compensator.
The submodule of present embodiment is used for the output required voltage, the utility model provide based on the structure of flow controller submodule between the line of modularization multi-level converter structure as shown in Figure 4, it is made of half-bridge structure and dc capacitor, described half-bridge structure comprises the IGBT module of two series connection up and down, parallel connection direct electric capacity between last pipe IGBT collector electrode and the following pipe IGBT emitter, half-bridge structure mid point and following submodule bypass circuit in parallel between the pipe IGBT emitter, get can power supply from the direct current capacitor power taking, for the control circuit of submodule provides the control power supply.The dc capacitor of submodule is used for providing submodule voltage to support.During the submodule internal fault, its bypass circuit is used for making submodule out of service, realizes the redundancy running of STATCOM.Get and to be used for providing the control power supply to the submodule control circuit by power supply.Control circuit is used for realization to control, monitoring and the protection of submodule.The bypass circuit of present embodiment can be realized that control circuit can be realized by numeral or analog circuit by switch.Can power supply referenced patent 201010624225.6 or ZL201020700480.X realization but get.
Embodiment 2
Present embodiment is substantially the same manner as Example 1, but distinctive points is:
The position of the reactor in first converter 7 and second converter 9 is different.The reactor of present embodiment is connected on first converter 7 and second converter, 9 positive and negative busbar sides, as shown in Figure 3.It is used for suppressing the current converter output harmonic wave.
Concrete, first converter 7 is made of three-phase six brachium pontis, and each brachium pontis comprises a reactor and N the submodule that structure is identical; An end is connected with described first start-up circuit 5 after the submodule cascade of each brachium pontis, is connected with other reactor of two brachium pontis behind the other end series reactor, forms first converter, 7 both positive and negative polarity buses.
Second converter 9 is made of three-phase six brachium pontis, and each brachium pontis comprises 1 reactor and M the submodule that structure is identical; An end is connected with described series transformer 10 after the submodule cascade of each brachium pontis; Be connected with other reactor of two brachium pontis behind the other end series reactor, form second converter, 9 both positive and negative polarity buses, be connected with the both positive and negative polarity bus of first converter 7.
Should be noted that at last: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit, although with reference to above-described embodiment the utility model is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement embodiment of the present utility model, and do not break away from any modification of the utility model spirit and scope or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present utility model.

Claims (10)

1.一种基于模块化多电平换流器结构的线间潮流控制器，其特征在于，所述线间潮流控制器包括静止同步补偿器（1）和静止同步串联补偿器（2）；  1. An interline power flow controller based on a modular multilevel converter structure, characterized in that the interline power flow controller includes a static synchronous compensator (1) and a static synchronous series compensator (2); 所述静止同步补偿器（1）包括第一换流器（7）和并联变压器（8）；  The static synchronous compensator (1) includes a first converter (7) and a parallel transformer (8); 所述静止同步串联补偿器（2）包括第二换流器（9）和串联变压器（10）；  The static synchronous series compensator (2) includes a second converter (9) and a series transformer (10); 所述第一换流器（7）通过并联变压器（8）并联接入输电线路I中；所述第二换流器（9）通过串联变压器（10）串联接入输电线路II中。  The first converter (7) is connected in parallel to the transmission line I through a parallel transformer (8); the second converter (9) is connected in series to the transmission line II through a series transformer (10). the 2.如权利要求1所述的线间潮流控制器，其特征在于，在所述静止同步补偿器（1）和所述静止同步串联补偿器（2）之间设置支撑电容（3）；所述支撑电容（3）分别与所述静止同步补偿器（1）和所述静止同步串联补偿器（2）并联。  2. The line-to-line power flow controller according to claim 1, characterized in that a support capacitor (3) is set between the static synchronous compensator (1) and the static synchronous series compensator (2); The support capacitor (3) is connected in parallel with the static synchronous compensator (1) and the static synchronous series compensator (2) respectively. the 3.如权利要求1所述的线间潮流控制器，其特征在于，所述静止同步补偿器（1）包括第一启动电路（5）；所述第一启动电路（5）与所述并联变压器（8）的副边连接，所述并联变压器（8）的原边与输电线路I并联。  3. The line-to-line power flow controller according to claim 1, characterized in that, the static synchronous compensator (1) includes a first start-up circuit (5); the first start-up circuit (5) is connected in parallel with the The secondary side of the transformer (8) is connected, and the primary side of the parallel transformer (8) is connected in parallel with the transmission line I. the 4.如权利要求3所述线间潮流控制器，其特征在于，所述第一启动电路（5）包括并联的电阻和开关。  4. The line-to-line power flow controller according to claim 3, characterized in that the first start-up circuit (5) comprises a resistor and a switch connected in parallel. the 5.如权利要求1所述的线间潮流控制器，其特征在于，所述静止同步串联补偿器（2）包括第二启动电路（6）；所述第二启动电路（6）一端与所述第二换流器（9）连接；所述第二启动电路（6）另一端与所述串联变压器（10）连接。  5. The line-to-line power flow controller according to claim 1, characterized in that the static synchronous series compensator (2) includes a second start-up circuit (6); one end of the second start-up circuit (6) is connected to the The second converter (9) is connected; the other end of the second start-up circuit (6) is connected to the series transformer (10). the 6.如权利要求5所述的线间潮流控制器，其特征在于，所述第二启动电路（6）包括并联的电阻和开关。  6. The line-to-line power flow controller according to claim 5, characterized in that, the second start-up circuit (6) comprises a resistor and a switch connected in parallel. the 7.如权利要求1所述的线间潮流控制器，其特征在于，所述串联变压器（10）连接负载串联接入输电线路II中。  7. The line-to-line power flow controller according to claim 1, characterized in that, the series transformer (10) is connected to a load in series and connected to the transmission line II. the 8.如权利要求1所述的线间潮流控制器，其特征在于，所述第一换流器（7）由三相六个桥臂构成，每个桥臂包括一个电抗器和N个结构相同的子模块；每个桥臂的子模块级联后一端通过电抗器与所述第一启动电路（5）连接；另一端与另两个桥臂的级联的子模块一端连接，形成所述第一换流器（7）的正负极母线；或  8. The line-to-line power flow controller according to claim 1, characterized in that, the first converter (7) is composed of three-phase six bridge arms, and each bridge arm includes a reactor and N structural The same sub-module; after the sub-modules of each bridge arm are cascaded, one end is connected to the first starting circuit (5) through a reactor; the other end is connected to one end of the cascaded sub-modules of the other two bridge arms to form the The positive and negative bus bars of the first converter (7); or 所述第一换流器（7）由三相六个桥臂构成，每个桥臂包括一个电抗器和N个结构相同的子模块；每个桥臂的子模块级联后一端与所述第一启动电路（5）连接，另一端串联电抗器后与另两个桥臂的电抗器连接，形成所述第一换流器（7）正负极母线。  The first converter (7) is composed of three-phase six bridge arms, each bridge arm includes a reactor and N sub-modules with the same structure; the sub-modules of each bridge arm are cascaded and one end is connected to the The first start-up circuit (5) is connected, and the other end is connected in series with the reactors of the other two bridge arms to form the positive and negative busbars of the first converter (7). the 9.如权利要求1所述的线间潮流控制器，其特征在于，所述第二换流器（9）由3相六个桥臂构成，每个桥臂包括1个电抗器和M个结构相同的子模块；每个桥臂的子模块级联后 一端通过电抗器与所述串联变压器（10）连接；另一端与另两个桥臂的级联的子模块一端连接，形成所述第二换流器（9）正负极母线，与所述第一换流器（7）的正负极母线连接；或  9. The line-to-line power flow controller according to claim 1, characterized in that, the second converter (9) is composed of 3-phase six bridge arms, and each bridge arm includes 1 reactor and M Submodules with the same structure; after the submodules of each bridge arm are cascaded, one end is connected to the series transformer (10) through a reactor; the other end is connected to one end of the cascaded submodules of the other two bridge arms to form the The positive and negative busbars of the second converter (9) are connected to the positive and negative busbars of the first converter (7); or 所述第二换流器（9）由3相六个桥臂构成，每个桥臂包括1个电抗器和M个结构相同的子模块；每个桥臂的子模块级联后一端与所述串联变压器（10）连接；另一端串联电抗器后与另两个桥臂的电抗器连接，形成所述第二换流器（9）正负极母线，与所述第一换流器（7）的正负极母线连接。  The second converter (9) is composed of 3-phase six bridge arms, each bridge arm includes a reactor and M sub-modules with the same structure; after the sub-modules of each bridge arm are cascaded, one end of the bridge arm is connected to the connected to the series transformer (10); the other end is connected to the reactors of the other two bridge arms after being connected in series with the reactor to form the positive and negative busbars of the second converter (9), which are connected to the first converter ( 7) The positive and negative bus connection. the 10.如权利要求8-9中任一项所述的线间潮流控制器，其特征在于，所述子模块由半桥结构与直流电容并联构成，所述半桥结构包括两个串联的IGBT模块，每个IGBT模块包括反并联的IGBT和二极管；  10. The line-to-line power flow controller according to any one of claims 8-9, wherein the sub-module is composed of a half-bridge structure connected in parallel with a DC capacitor, and the half-bridge structure includes two IGBTs connected in series modules, each IGBT module includes anti-parallel IGBTs and diodes; 所述半桥结构中点与IGBT发射极之间并联子模块旁路电路；  A sub-module bypass circuit is connected in parallel between the midpoint of the half-bridge structure and the IGBT emitter; 所述直流电容通过取能电源为子模块的控制电路提供电源。  The DC capacitor provides power for the control circuit of the sub-module through the energy harvesting power supply. the
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102969708A (en) * 2012-07-13 2013-03-13 中电普瑞科技有限公司 Interline power flow controller based on modular multi-level converter structure
CN103954866A (en) * 2014-05-09 2014-07-30 国家电网公司 Testing circuit of half-bridge-structure voltage source current converter and modulation method thereof
CN104377720A (en) * 2014-11-05 2015-02-25 无锡中汇汽车电子科技有限公司 Direct-current transmission current control method based on MMC converter station
CN105870927A (en) * 2016-03-14 2016-08-17 全球能源互联网研究院 Unified power flow controller with multiple operational modes

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102969708A (en) * 2012-07-13 2013-03-13 中电普瑞科技有限公司 Interline power flow controller based on modular multi-level converter structure
CN102969708B (en) * 2012-07-13 2015-08-05 中电普瑞科技有限公司 Flow controller between a kind of line based on modular multilevel converter structure
CN103954866A (en) * 2014-05-09 2014-07-30 国家电网公司 Testing circuit of half-bridge-structure voltage source current converter and modulation method thereof
CN103954866B (en) * 2014-05-09 2017-04-05 国家电网公司 A kind of hookup and its modulator approach of half-bridge structure voltage source converter
CN104377720A (en) * 2014-11-05 2015-02-25 无锡中汇汽车电子科技有限公司 Direct-current transmission current control method based on MMC converter station
CN105870927A (en) * 2016-03-14 2016-08-17 全球能源互联网研究院 Unified power flow controller with multiple operational modes

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