CN102013685A - Transformerless STATCOM (Static Compensator) topological structure based on MMC (Modular Multilevel Converter) - Google Patents

Transformerless STATCOM (Static Compensator) topological structure based on MMC (Modular Multilevel Converter) Download PDF

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Publication number
CN102013685A
CN102013685A CN2010102337134A CN201010233713A CN102013685A CN 102013685 A CN102013685 A CN 102013685A CN 2010102337134 A CN2010102337134 A CN 2010102337134A CN 201010233713 A CN201010233713 A CN 201010233713A CN 102013685 A CN102013685 A CN 102013685A
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CN
China
Prior art keywords
statcom
mmc
modular multilevel
charging resistor
topological structure
Prior art date
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Pending
Application number
CN2010102337134A
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Chinese (zh)
Inventor
张坤
杨洋
赵淑玉
张跃平
胡涛
李太峰
魏西平
王振
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Rongxin Power Electronic Co Ltd
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Rongxin Power Electronic 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.)
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Publication date
Application filed by Rongxin Power Electronic Co Ltd filed Critical Rongxin Power Electronic Co Ltd
Priority to CN2010102337134A priority Critical patent/CN102013685A/en
Publication of CN102013685A publication Critical patent/CN102013685A/en
Priority to PCT/CN2011/076850 priority patent/WO2012010053A1/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1864—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein the stepless control of reactive power is obtained by at least one reactive element connected in series with a semiconductor switch
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
    • 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]

Abstract

The invention relates to a transformerless STATCOM (Static Compensator) topological structure based on MMC (Modular Multilevel Converter), which comprises three phases; each phase is formed by connecting standard power units of a plurality of modular multilevel converters in series; after series connection, one ends of the standard power units are connected one another, and the other ends are connected with an inductor; the inductor is connected with a charging resistor; and after being connected with a switch in parallel, the charging resistor is accessed to a power grid via another switch. The standard power units adopt the charging resistor and a capacitance to supply DC side voltage. The invention has the advantages that by adopting the structure, a transformer parallel in a traditional STATCOM can be omitted, and therefore achieving the purposes of cost reduction, space saving and simple structure.

Description

A kind of transless STATCOM topological structure based on MMC
Technical field
The present invention relates to a kind of transless STATCOM topology based on MMC (Modular Multilevel Converter) modular multilevel inverter.
Background technology
In electric power system, reactive power is to influence a stable key factor of voltage, and can it be related to whole electric power system and safely and steadily run, and reactive power compensation is to guarantee one of effective measures of electric power system high efficient and reliable operation.
The power distribution network transformation of nationwide is carried out comprehensively, especially low pressure city net and the rural power grids active power loss is big, pressure drop is big practical ways adopt the high performance reactive power compensation arrangement exactly to solve present electrical network, the lagging reactive power of local compensation load, reduce reactive power transmission on the line, reduce active power loss and voltage landing on the equipment for power transmission and distribution, improve the power transmission and distribution ability of system.STATCOM (STATCOM) has boundless application prospect and huge market potential.Reactive power compensator of the prior art all is that direct voltage is reverse into three-phase alternating current through sending into electrical network behind the transformer, has the design of transformer, make equipment investment big, take up an area of many, the cost height, the production cycle is long.
Summary of the invention
The purpose of this invention is to provide a kind of transless STATCOM topological structure based on MMC, this structure does not need the be incorporated into the power networks transformer of side of traditional STATCOM, reduces cost thereby reach, and saves the space, purpose simple in structure.
For achieving the above object, the present invention is achieved through the following technical solutions:
A kind of transless STATCOM topological structure based on MMC, it is characterized in that, by three phase compositions, every calibration power units in series by a plurality of modular multilevel converte modular multilevel inverters is formed, calibration power unit one after series connection terminates at together, and the other end is connected with inductance; Inductance connects charging resistor, behind the charging resistor switch in parallel, inserts electrical network by another switch again.
Described calibration power unit is a half-bridge structure, two IGBT series connection, dc capacitor in parallel again.
Described calibration power unit provides calibration power unit dc voltage by charging resistor and capacitances to supply power.
Compared with prior art, novelty of the present invention and creativeness are embodied in:
1, the transless configuration makes equipment cost reduce by 1/2.
2, the transless configuration makes equipment volume reduce 1/2.
3, the transless configuration makes weight of equipment reduce 1/2.
4, the transless configuration makes the device fabrication cycle reduce 1/2.
5, the transless configuration has saved the structure and the space of carrying transformer.
6, the transless configuration has saved the high-tension cable that connects transformer.
7, each power cell has only two IGBT, has significantly reduced unit volume and cost.
Description of drawings
Fig. 1 is based on the transless STATCOM topology diagram of MMC;
Fig. 2 is calibration power cellular construction figure;
Fig. 3-the 1st, power cell output state are the current direction figure of 0 state;
Fig. 3-the 2nd, power cell output state are the current direction figure of 0 state;
Fig. 4-the 1st, power cell output state are the current direction figure of 1 state;
Fig. 4-the 2nd, power cell output state are the current direction figure of 1 state.
Embodiment
See Fig. 1, a kind of transless STATCOM topological structure based on MMC by three phase compositions, adopts star-like connected mode.Every calibration power units in series by n modular multilevel converte modular multilevel inverter is formed, and the calibration power unit one after series connection terminates at together, and the other end is connected with inductance L; Inductance L connects charging resistor R, behind the charging resistor R paralleling switch K2, inserts electrical network by another K switch 1 again.The calibration power unit provides calibration power unit dc voltage by charging resistor R and the power supply of capacitor C (see figure 2).
See Fig. 2, the calibration power unit of inverter is made up of two switching device IGBT and dc bus capacitor C, and switching device IGBT1 and IGBT2 are in series, again and with dc capacitor C, and switching device IGBT1 and IGBT2 reversal connection diode D1, a D2 respectively in parallel.The common port of switching device IGBT1 and IGBT2, the common port of capacitor C and IGBT2 link to each other with other unit as the output of each unit.
This topology realizes the compensation to power system reactive power by the control to calibration power unit switch break-over of device and shutoff, improves power grid quality.The grid voltage of control IGBT makes its conducting or shutoff, can make the unit have different circuit states.Definition IGBT1 turn-offs, and the IGBT2 conducting is 0 state of unit, and this moment, electric current can be crossed (Fig. 3-1) through the IGBT2 positive flow, also can cross (Fig. 3-2) through parallel diode D2 reverse flow.Definition IGBT1 conducting, IGBT2 turn-offs and be 1 state of unit, the electric current diode D1 (Fig. 4-1) that can flow through, and this moment, electric capacity charged; The IGBT1 (Fig. 4-2) that also can flow through, this moment capacitor discharge.
This topology is utilized the MMC power unit cascade, does not need transformer directly to be connected to the grid, and has saved transformer and relevant blower fan, high-tension cable, the structure and the space of auxiliary circuit and carrying transformer.

Claims (3)

1. transless STATCOM topological structure based on MMC, it is characterized in that, by three phase compositions, every calibration power units in series by a plurality of modular multilevel converte modular multilevel inverters is formed, calibration power unit one after series connection terminates at together, and the other end is connected with inductance; Inductance connects charging resistor, behind the charging resistor switch in parallel, inserts electrical network by another switch again.
2. a kind of transless STATCOM topological structure based on MMC according to claim 1 is characterized in that described calibration power unit is a half-bridge structure, two IGBT series connection, dc capacitor in parallel again.
3. a kind of transless STATCOM topological structure based on MMC according to claim 1 and 2 is characterized in that described calibration power unit provides calibration power unit dc voltage by charging resistor and capacitances to supply power.
CN2010102337134A 2010-07-22 2010-07-22 Transformerless STATCOM (Static Compensator) topological structure based on MMC (Modular Multilevel Converter) Pending CN102013685A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2010102337134A CN102013685A (en) 2010-07-22 2010-07-22 Transformerless STATCOM (Static Compensator) topological structure based on MMC (Modular Multilevel Converter)
PCT/CN2011/076850 WO2012010053A1 (en) 2010-07-22 2011-07-05 Transformer-less static synchronous compensator (statcom) topological structure based on modular multilevel converter (mmc)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2010102337134A CN102013685A (en) 2010-07-22 2010-07-22 Transformerless STATCOM (Static Compensator) topological structure based on MMC (Modular Multilevel Converter)

Publications (1)

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WO (1) WO2012010053A1 (en)

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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)
CN102364849A (en) * 2011-09-05 2012-02-29 江苏南自通华电气集团有限公司 Two-stage voltage reduction control power supply for power unit in chain-type var generator
CN102832841A (en) * 2012-08-27 2012-12-19 清华大学 Modularized multi-level converter with auxiliary diode
CN102946114A (en) * 2012-10-23 2013-02-27 南京南瑞继保电气有限公司 Inverter charging method of flexible direct current power transmission system
CN103390896A (en) * 2012-05-09 2013-11-13 华锐风电科技(集团)股份有限公司 Hybrid cascading multi-level static synchronous compensation device and wind turbine generator set power supply system
CN103560687A (en) * 2013-09-27 2014-02-05 株洲变流技术国家工程研究中心有限公司 Modular multilevel converter system and control system and control method thereof
CN104092239A (en) * 2014-06-25 2014-10-08 国家电网公司 Photovoltaic grid-connected control method based on modular multilevel converter
CN105164892A (en) * 2013-03-08 2015-12-16 Abb技术有限公司 Alternating current (AC) synchronization for load restoration
CN106208396A (en) * 2016-08-01 2016-12-07 浙江大学 A kind of distributing hybrid energy-storing based on MMC topology and electric power compensation system
CN108092520A (en) * 2016-11-14 2018-05-29 江苏同芯电气科技有限公司 Power-supply system is controlled in a kind of H bridge connection in series-parallel based on single charge circuit soon

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US9941813B2 (en) 2013-03-14 2018-04-10 Solaredge Technologies Ltd. High frequency multi-level inverter
US9318974B2 (en) 2014-03-26 2016-04-19 Solaredge Technologies Ltd. Multi-level inverter with flying capacitor topology
US9515568B2 (en) 2014-03-28 2016-12-06 General Electric Company Power converter with a first string having diodes and a second string having switching units
US10469298B2 (en) * 2017-05-12 2019-11-05 Qualcomm Incorporated Increasing reference signal density in wireless communications

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Cited By (16)

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Publication number Priority date Publication date Assignee Title
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)
CN102364849A (en) * 2011-09-05 2012-02-29 江苏南自通华电气集团有限公司 Two-stage voltage reduction control power supply for power unit in chain-type var generator
CN103390896B (en) * 2012-05-09 2015-11-25 华锐风电科技(集团)股份有限公司 Mixed cascading multi-level static synchronous compensator plant and Wind turbines electric power system
CN103390896A (en) * 2012-05-09 2013-11-13 华锐风电科技(集团)股份有限公司 Hybrid cascading multi-level static synchronous compensation device and wind turbine generator set power supply system
CN102832841B (en) * 2012-08-27 2014-09-17 清华大学 Modularized multi-level converter with auxiliary diode
CN102832841A (en) * 2012-08-27 2012-12-19 清华大学 Modularized multi-level converter with auxiliary diode
CN102946114B (en) * 2012-10-23 2015-06-03 南京南瑞继保电气有限公司 Inverter charging method of flexible direct current power transmission system
CN102946114A (en) * 2012-10-23 2013-02-27 南京南瑞继保电气有限公司 Inverter charging method of flexible direct current power transmission system
CN105164892A (en) * 2013-03-08 2015-12-16 Abb技术有限公司 Alternating current (AC) synchronization for load restoration
CN105164892B (en) * 2013-03-08 2018-04-03 Abb技术有限公司 The method and system synchronous for the exchange (AC) of load restoration
CN103560687A (en) * 2013-09-27 2014-02-05 株洲变流技术国家工程研究中心有限公司 Modular multilevel converter system and control system and control method thereof
CN103560687B (en) * 2013-09-27 2016-05-18 株洲变流技术国家工程研究中心有限公司 Modular multi-level converter system, and control system and control method
CN104092239A (en) * 2014-06-25 2014-10-08 国家电网公司 Photovoltaic grid-connected control method based on modular multilevel converter
CN106208396A (en) * 2016-08-01 2016-12-07 浙江大学 A kind of distributing hybrid energy-storing based on MMC topology and electric power compensation system
CN106208396B (en) * 2016-08-01 2019-05-31 浙江大学 A kind of distributing hybrid energy-storing based on MMC topology and electric power compensation system
CN108092520A (en) * 2016-11-14 2018-05-29 江苏同芯电气科技有限公司 Power-supply system is controlled in a kind of H bridge connection in series-parallel based on single charge circuit soon

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Application publication date: 20110413