CN102013694A - Transformerless wind power generation grid-connected topology structure based on MMC - Google Patents

Transformerless wind power generation grid-connected topology structure based on MMC Download PDF

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Publication number
CN102013694A
CN102013694A CN2010102336998A CN201010233699A CN102013694A CN 102013694 A CN102013694 A CN 102013694A CN 2010102336998 A CN2010102336998 A CN 2010102336998A CN 201010233699 A CN201010233699 A CN 201010233699A CN 102013694 A CN102013694 A CN 102013694A
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China
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voltage
power
output
unit
grid
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CN2010102336998A
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Chinese (zh)
Inventor
张跃平
李太峰
魏西平
杨洋
赵淑玉
张坤
胡涛
王振
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Rongxin Power Electronic Co Ltd
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Rongxin Power Electronic Co Ltd
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Priority to CN2010102336998A priority Critical patent/CN102013694A/en
Publication of CN102013694A publication Critical patent/CN102013694A/en
Priority to PCT/CN2011/076845 priority patent/WO2012010052A1/en
Pending legal-status Critical Current

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    • 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
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/40—Synchronising a generator for connection to a network or to another generator
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/60—Planning or developing urban green infrastructure
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)
  • Inverter Devices (AREA)

Abstract

The invention relates to a transformerless wind power generation grid-connected topology structure based on MMC, comprising a wind power generating unit, a rectifier module and an inversion module, wherein the wind power generating unit generates a low-voltage alternating current, the low-voltage alternating current is rectified with the rectifier module to obtain direct-current voltage, the direct current voltage is used as direct current side voltage power supply of a power unit of the inversion module, alternating voltage subjected to inversion from the direct-current voltage is connected in series through the power unit to form alternating current high voltage, and the inversion module outputs the alternating current high voltage from an alternating current side through a buffer inductor to be integrated into a power grid. The invention has the advantages of outputting high voltage through a serial connection method of the power unit, saving a step-up transformer in the process of general wind power generation grid connection and saving a large quantity of cost. In addition, because a plurality of units are adopted to be connected in series with the power unit to output high voltage, a multilevel waveform can be output through a modulation algorithm, thereby reducing the content of output harmonic waves and reducing pollution of wind power generation to the power grid.

Description

Based on the wind power-generating grid-connected topological structure of the transless of MMC
Technical field
The present invention relates to the wind-driven generator interconnection technology, particularly a kind of transformerless wind power-generating grid-connected topological structure based on MMC modular multilevel inverter (Modular Multilevel Converter).
Background technology
The wind energy resources of China is very abundant, estimates according to National Meteorological Bureau, and China 10m height is about 1,000,000,000 kW with the interior earth surface wind electric energy that develops, land 2.5 hundred million kW wherein, marine 7.5 hundred million kW, if expand to the above height of 50～60m, wind resource will be expected to expand to 20～2,500,000,000 kW.Therefore, wind power generation is the reality of China's energy sustainable development and important selection.
Wind-driven generator all is by universal frequency converter basically, makes phase place own identical with electrical network.Be incorporated into the power networks with step-up transformer and electrical network more at last.Cause each wind-driven generator all to need a step-up transformer like this, the step-up transformer volume is big, and quality is heavy, cost height, structure complicated.And make each wind-driven generator have only 3 level, harmonic content is very big, and many electric network pollutions are serious.And needing control separately for each wind-driven generator, the control difficulty is big, control loaded down with trivial detailsly, is difficult for large-scale, the ultra-large type wind-force electric field controls of formation.
What wind power generation was exported all is two level or three level, and harmonic content is big, can not directly be connected to the grid after boosting, and need add the output filter.
Summary of the invention
The purpose of this invention is to provide the wind power-generating grid-connected topological structure of a kind of transless based on MMC, by the method for power unit cascade, the output high pressure; Save general step-up transformer when wind power-generating grid-connected, saved great amount of cost.In addition,, can export many level waveform, reduce output harmonic wave content, reduce the pollution of wind power generation electrical network by modulation algorithm owing to adopt multiple unit series connection power cell output high pressure.
For achieving the above object, the present invention is achieved through the following technical solutions:
Based on the wind power-generating grid-connected topological structure of the transless of MMC, comprise wind turbine generator, rectification module, inversion module, wind turbine generator produces low-voltage AC, obtain direct voltage after the rectification module rectification, this direct voltage is as the dc voltage power supply of inversion module power cell; The alternating voltage of inversion module after with the direct voltage inversion becomes ac high-voltage to export through buffer inductance from AC side through power unit cascade, is connected to the grid.
Described inversion module is a three-phase, is whenever formed by an even number n power unit cascade, is divided into two groups up and down, and every group power cell number is n/2, and output phase voltage level ladder number is n/2+1, and line voltage level number is n+1; The output of every phase is the midpoint of two groups of unit, and is connected with coupling or non-coupling buffer inductance between output and the every group of unit; At output is the midpoint output AC high pressure of two groups of unit.
Described power cell is a half-bridge structure, and switching device IGBT1 and IGBT2 are in series, and IGBT1 of parallel connection direct capacitor C, and switching device again and IGBT2 be inverse parallel diode D1, D2 respectively; The common port of IGBT1 and IGBT2, the common port of capacitor C and IGBT2 link to each other with other unit as the output of each unit.
Described rectification module is made up of the uncontrollable full-bridge of diode.
Wind turbine generator produces low-voltage AC, obtains direct voltage after the rectification module rectification, and this direct voltage is as the dc voltage power supply of inversion module power cell; The direct voltage of inversion module after with the direct voltage inversion becomes high direct voltage to export from DC side through power unit cascade, is connected to the grid.
Compared with prior art, the invention has the beneficial effects as follows:
1) input transless, and then wind-electricity integration topology volume is reduced, take up an area of and reduce, weight saving, cost reduces; Simultaneously can reduce transformer energy consumption, manufacturing process is oversimplified, the production cycle reduces;
2) wind-driven generator is directly connected to power cell rectification side, and wind-driven generator is not had specific (special) requirements, reduces motor cost;
3) modulator approach adopts the method for phase-shifting carrier wave, can produce the multi-ladder sine wave, obtains output voltage waveforms preferably with less switching frequency;
4) can be connected into ac high-voltage to whole wind power plant, directly export from AC side;
5) can be connected into high direct voltage to whole wind power plant, directly export from DC side;
6) application prospect is extensive in high-power, multi-machine system.
Description of drawings
Fig. 1 is based on the wind power-generating grid-connected topology diagram of transless of MMC;
Fig. 2 is based on the prime power cellular construction figure of the wind power-generating grid-connected topological structure of transless of MMC;
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. 3-the 3rd, power cell output state are the current direction figure of 1 state;
Fig. 3-the 4th, power cell output state are the current direction figure of 1 state.
Embodiment
See Fig. 1, based on the wind power-generating grid-connected topological structure of the transless of MMC, comprise wind turbine generator, rectification module, inversion module, wind turbine generator produces low-voltage AC, obtain direct voltage after the rectification module rectification, this direct voltage is as the dc voltage power supply of inversion module power cell; The alternating voltage of inversion module after with the direct voltage inversion becomes ac high-voltage through power unit cascade, from exchanging U, V, W side through buffer inductance L output, is connected to the grid.
Inversion module also can become high direct voltage directly from direct current A, B side output high direct voltage through power unit cascade the direct voltage after the direct voltage inversion, is connected to the grid.
This topological structure inversion module is a three-phase, is whenever formed by an even number n power unit cascade, comprises 3n power cell altogether, and each power cell is given the power supply of power cell capacitor C by a wind-driven generator M by the uncontrollable full-bridge rectification of three-phase.
Each of inversion module is formed by an even number n power unit cascade, is divided into two groups up and down, and every group power cell number is n/2, and output phase voltage level ladder number is n/2+1, and line voltage level number is n+1; The output of every phase is the midpoint of two groups of unit, and is connected with coupling or non-coupling buffer inductance between output and the every group of unit; At output is the midpoint output AC high pressure of two groups of unit.
See Fig. 2, power cell inversion side is a half-bridge structure, and switching device IGBT1 and IGBT2 are in series, and IGBT1 of parallel connection direct capacitor C, and switching device again and IGBT2 be inverse parallel diode D11, D22 respectively; The common port of IGBT1 and IGBT2, the common port of capacitor C and IGBT2 link to each other with other unit as the output of each unit.The rectification side is formed uncontrollable full-bridge by diode D1, D2, D3, D4, D5, D6.
This topology utilizes wind-driven generator as energy relaying pond, gives the unit DC bus powered, in conjunction with certain modulator approach, produces the many level-variables sine wave that needs.Inversion module is by three phase compositions, whenever formed by an even number n power unit cascade.The series unit number is called unit progression.Series connection can directly directly be exported high direct voltage in A, B side, also can be at U, V, W side output AC high pressure.Concerning from the ac high-voltage that exchanges U, V, the output of W side, ac high-voltage contains harmonic wave still less, and is littler to electric network pollution.
The grid voltage of control IGBT makes its conducting or shutoff, can make the unit have different circuit states.
See Fig. 3-1, electric current flows to B through IGBT2 from A, adopts the power cell output level " 0 " of half bridge inverter circuit.
See Fig. 3-2, electric current flows to A through sustained diode 2 from B, adopts the power cell output level " 0 " of half bridge inverter circuit.
See Fig. 3-3, electric current by dc bus capacitor C, flows to B from A again through sustained diode 1, adopts the power cell output level " 1 " of half bridge inverter circuit.
See Fig. 3-4, electric current by dc bus capacitor C, flows to A from B again through IGBT1, adopts the power cell output level " 1 " of half bridge inverter circuit.
If power cell progression is selected suitably, output voltage can reach the electrical network rank, can send voltage waveform with synchronized according to line voltage, and output harmonic wave meets the demands, and then can directly generate electricity by way of merging two or more grid systems.

Claims (5)

1. based on the wind power-generating grid-connected topological structure of the transless of MMC, it is characterized in that, comprise wind turbine generator, rectification module, inversion module, wind turbine generator produces low-voltage AC, obtain direct voltage after the rectification module rectification, this direct voltage is as the dc voltage power supply of inversion module power cell; The alternating voltage of inversion module after with the direct voltage inversion becomes ac high-voltage to export through buffer inductance from AC side through power unit cascade, is connected to the grid.
2. the wind power-generating grid-connected topological structure of the transless based on MMC according to claim 1, it is characterized in that, described inversion module is a three-phase, whenever, form by an even number n power unit cascade, be divided into two groups up and down, every group power cell number is n/2, and output phase voltage level ladder number is n/2+1, and line voltage level number is n+1; The output of every phase is the midpoint of two groups of unit, and is connected with coupling or non-coupling buffer inductance between output and the every group of unit; At output is the midpoint output AC high pressure of two groups of unit.
3. the wind power-generating grid-connected topological structure of the transless based on MMC according to claim 2, it is characterized in that, described power cell is a half-bridge structure, switching device IGBT1 and IGBT2 are in series, IGBT1 of parallel connection direct capacitor C, and switching device again and IGBT2 be inverse parallel diode D1, D2 respectively; The common port of IGBT1 and IGBT2, the common port of capacitor C and IGBT2 link to each other with other unit as the output of each unit.
4. a kind of transless hydraulic generator electricity generation grid-connecting topological structure according to claim 1 is characterized in that described rectification module is made up of the uncontrollable full-bridge of diode.
5. according to the wind power-generating grid-connected topological structure of each described transless in the claim 1 to 3 based on MMC, it is characterized in that, wind turbine generator produces low-voltage AC, obtain direct voltage after the rectification module rectification, this direct voltage is as the dc voltage power supply of inversion module power cell; The direct voltage of inversion module after with the direct voltage inversion becomes high direct voltage to export from DC side through power unit cascade, is connected to the grid.
CN2010102336998A 2010-07-22 2010-07-22 Transformerless wind power generation grid-connected topology structure based on MMC Pending CN102013694A (en)

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PCT/CN2011/076845 WO2012010052A1 (en) 2010-07-22 2011-07-05 Mmc-based transformer-free wind power grid-connected topological structure

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CN102136729A (en) * 2011-02-22 2011-07-27 西安交通大学 Series multi-level SVG (scalable vector graphics) topological structure based on phase shifting multiple winding rectifier transformer and control method thereof
WO2012010052A1 (en) * 2010-07-22 2012-01-26 荣信电力电子股份有限公司 Mmc-based transformer-free wind power grid-connected topological structure
CN102663174A (en) * 2012-03-23 2012-09-12 浙江大学 Simulation method of MMC (modular multilevel converter) and application thereof
CN103427657A (en) * 2013-08-01 2013-12-04 南京南瑞继保电气有限公司 High-voltage DC-DC conversion device
CN103762874A (en) * 2014-01-28 2014-04-30 华南理工大学 Double-load three-phase nine-switch-block MMC inverter and control method thereof
CN103780113A (en) * 2014-01-28 2014-05-07 华南理工大学 N-output three-phase 3N+3-switch-group MMC inverter and control method of N-output three-phase 3N+3-switch-group MMC inverter
CN103825488A (en) * 2014-01-28 2014-05-28 华南理工大学 Dual-output single-phase six-switch block MMC inverter and control method thereof
CN103904910A (en) * 2014-03-27 2014-07-02 华南理工大学 Single-phase six-switching-group MMC AC-AC converter and control method thereof
US9608544B2 (en) 2012-09-14 2017-03-28 Robert Bosch Gmbh Energy supply system comprising an energy storage device and method for actuating coupling devices of the energy storage device
CN107404233A (en) * 2017-07-24 2017-11-28 中国电力科学研究院 A kind of DC transmission system
ES2824579A1 (en) * 2019-11-12 2021-05-12 Univ Valladolid WIND TURN CONNECTION STRUCTURE (Machine-translation by Google Translate, not legally binding)
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US9608544B2 (en) 2012-09-14 2017-03-28 Robert Bosch Gmbh Energy supply system comprising an energy storage device and method for actuating coupling devices of the energy storage device
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CN103427657A (en) * 2013-08-01 2013-12-04 南京南瑞继保电气有限公司 High-voltage DC-DC conversion device
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CN103904910A (en) * 2014-03-27 2014-07-02 华南理工大学 Single-phase six-switching-group MMC AC-AC converter and control method thereof
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Application publication date: 20110413