CN102013823A - Transformer-free solar inverter topological structure based on MMC - Google Patents

Transformer-free solar inverter topological structure based on MMC Download PDF

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Publication number
CN102013823A
CN102013823A CN2010102337098A CN201010233709A CN102013823A CN 102013823 A CN102013823 A CN 102013823A CN 2010102337098 A CN2010102337098 A CN 2010102337098A CN 201010233709 A CN201010233709 A CN 201010233709A CN 102013823 A CN102013823 A CN 102013823A
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China
Prior art keywords
inverter
mmc
power unit
voltage
topological structure
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Pending
Application number
CN2010102337098A
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Chinese (zh)
Inventor
张坤
张跃平
胡涛
李太峰
魏西平
杨洋
赵淑玉
王振
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Rongxin Power Electronic Co Ltd
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Rongxin Power Electronic Co Ltd
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Application filed by Rongxin Power Electronic Co Ltd filed Critical Rongxin Power Electronic Co Ltd
Priority to CN2010102337098A priority Critical patent/CN102013823A/en
Publication of CN102013823A publication Critical patent/CN102013823A/en
Priority to PCT/CN2011/076853 priority patent/WO2012010054A1/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
    • 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
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • 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
    • 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
    • H02M7/493—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 the static converters being arranged for operation in parallel
    • 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
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention relates to a transformer-free solar inverter topological structure based on an MMC, which comprises a photocell array, a direct-current converting circuit and an inverter consisting of a plurality of standard power units, wherein a direct-current voltage generated by the photocell array is converted into a stable direct-current voltage through the direct-current converting circuit to be used as a direct-current side voltage of each standard power unit in the inverter, the synthesis of a three-phase alternating-current voltage is realized through controlling the on and the off of a switching element of each power unit so as to directly achieve the purpose of high-voltage output and access power grid. The invention has the advantages of realization of high-voltage output by adopting a superpositioning manner of the standard power units without arranging a transformer at the synchronization side of a photovoltaic system, low cost, space saving, simple structure and high response speed.

Description

A kind of transless solar inverter topological structure based on MMC
Technical field
The present invention relates to a kind of transless solar inverter topological structure based on MMC (Modular Multilevel Converter) modular multilevel inverter.
Background technology
In the epoch of current energy scarcity, photovoltaic generation is generally approved as regenerative resource and is greatly developed.China is backward relatively to the exploitation of luminous energy, and technology is in ascent stage, and the area of China is big, and solar energy year, amount of radiation was above 600kJ/cm 2, the solar energy that the annual face of land absorbs is equivalent to the energy of 17,000,000,000,000 tons of standard coals, therefore has good development prospect.
Photocell is the main devices that luminous energy is converted into electric energy.The photovoltaic cell arrays that photovoltaic generating system usually adopts some photocells to form, with reach combining inverter than high input voltage.
Solar inverter can be described as photovoltaic DC-to-AC converter again, is the conversion equipment that luminous energy is converted into electric energy.Solar inverter of the prior art is that the direct voltage that array is synthetic is reverse into three-phase alternating current, sends into electrical network through 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 solar inverter topological structure based on MMC, this topological structure need not be provided with the be incorporated into the power networks transformer of side of photovoltaic generating system, adopts the stacking pattern of a plurality of calibration powers unit, realizes high pressure output; Cost is low, saves the space, and simple in structure, reaction speed is fast.
For achieving the above object, the present invention is achieved through the following technical solutions:
A kind of transless solar inverter topological structure based on MMC, the inverter that comprises photovoltaic cell arrays, DC transfer circuit, constitutes by a plurality of calibration powers unit, the direct voltage that photovoltaic cell arrays produces, after DC transfer circuit is transformed to the galvanic current pressure, as the dc voltage of each calibration power unit in the inverter,, realize the synthetic of three-phase alternating voltage by conducting and the shutoff of controlling each power cell switching device, directly reach high pressure output, be connected to the grid.
The power cell of inverter adopts the MMC unit as the calibration power unit, and the calibration power unit adopts half-bridge structure, two IGBT series connection up and down, dc capacitor in parallel again; Each calibration power unit is equipped with solar panel and DC transfer circuit, provides direct voltage by solar panel, is converted to galvanic current through DC transfer circuit and presses.
Inverter is a three-phase, whenever is made up of even number n calibration power unit, is divided into two groups up and down, and every group calibration power unit 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 standard sets power cell up and down, and between output and the every group of unit to be coupled or non-coupling inductance is connected.
Compared with prior art, the invention has the beneficial effects as follows:
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, the transless configuration makes the transportation convenience degree strengthen greatly.
8, adopt novel MMC calibration power unit, control strategy is simple and reliable.
Description of drawings
Fig. 1 is the topological structure schematic diagram of solar inverter;
Fig. 2 is the calibration power cell schematics of solar inverter;
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 solar inverter topological structure based on MMC, the inverter that comprises photovoltaic cell arrays, DC transfer circuit, constitutes by a plurality of calibration powers unit, the direct voltage that photovoltaic cell arrays produces, after DC transfer circuit is transformed to the galvanic current pressure, dc voltage as each calibration power unit in the inverter, by conducting and the shutoff of controlling each power cell switching device, realize the synthetic of A, B, C three-phase alternating voltage, directly reach high pressure output, directly be connected to the grid without transformer.This topology is based on the half-bridge serial connection technology, and the power cell type of employing is modular multilevel modular multilevel converter, is called MMC calibration power unit, is half-bridge structure.Can directly reach high pressure output, directly be connected to the grid, not need transformer, make cost reduce greatly, saved blower fan, the relevant high-tension cable of transformer has been saved in the structure and the space of carrying transformer, compact conformation, control simple and direct, for solar power generation provides a kind of new topologies.
See Fig. 2, the calibration power unit of inverter adopts half-bridge structure, is made up of two switching device IGBT and dc bus capacitor C, and IGBT1 and IGBT2 are in series, again and with dc capacitor C, and IGBT1 and IGBT2 reversal connection diode D1 of parallel connection respectively, D2.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.Each calibration power unit is equipped with solar panel to carry out photovoltaic generation direct voltage is provided, and to adopt DC transfer circuit to be transformed to be that galvanic current is pressed.
Inverter is a three-phase, whenever is made up of even number n calibration power unit, is divided into two groups up and down, and every group calibration power unit 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 standard sets power cell up and down, and between output and the every group of unit to be coupled or non-coupling inductance L is connected.The inverter direct voltage that the unit DC side is synthetic is modulated into the three-phase voltage of interchange, by three output outputs, directly is connected to the grid.Every group calibration power unit number of inverter is called inverter progression, and the actual conditions that the several certificates of inverter stage are concrete need be determined.
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 (seeing Fig. 3-1) through the IGBT2 positive flow, also can cross (seeing 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 (seeing Fig. 4-2) that can flow through, and this moment, electric capacity charged; The IGBT1 (seeing Fig. 4-1) that also can flow through, this moment capacitor discharge.
If frequency converter progression is selected suitably, frequency converter output voltage can reach the electrical network rank, and frequency converter will send voltage waveform with synchronized according to line voltage, generate electricity by way of merging two or more grid systems.
The array structure of photovoltaic cell can be concentrated, serial type, form such as many trails are medium-sized.The step-up transformer that is not incorporated into the power networks does not have blower fan, high-tension cable, the auxiliary circuit relevant with transformer, the structure and the space that do not need to carry transformer yet.Every phase upper and lower bridge arm is linked to each other by the buffering reactance, and this reactance can be coupling reactance or non-coupling reactance.

Claims (4)

1. transless solar inverter topological structure based on MMC, it is characterized in that, the inverter that comprises photovoltaic cell arrays, DC transfer circuit, constitutes by a plurality of calibration powers unit, the direct voltage that photovoltaic cell arrays produces, after DC transfer circuit is transformed to the galvanic current pressure, dc voltage as each calibration power unit in the inverter, by conducting and the shutoff of controlling each power cell switching device, realize the synthetic of three-phase alternating voltage, directly reach high pressure output, be connected to the grid.
2. a kind of transless solar inverter topological structure according to claim 1 based on MMC, it is characterized in that, the power cell of inverter adopts the MMC unit as the calibration power unit, the calibration power unit adopts half-bridge structure, two IGBT series connection up and down, dc capacitor in parallel again; Each calibration power unit is equipped with solar panel and DC transfer circuit, provides direct voltage by solar panel, is converted to galvanic current through DC transfer circuit and presses.
3. a kind of transless solar inverter topological structure according to claim 2 based on MMC, it is characterized in that, inverter is a three-phase, whenever, form by even number n calibration power unit, be divided into two groups up and down, every group calibration power unit 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 standard sets power cell up and down, and between output and the every group of unit to be coupled or non-coupling inductance is connected.
4. a kind of transless solar inverter topological structure based on MMC according to claim 1 is characterized in that, described photovoltaic cell arrays adopts solar panel to constitute.
CN2010102337098A 2010-07-22 2010-07-22 Transformer-free solar inverter topological structure based on MMC Pending CN102013823A (en)

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CN2010102337098A CN102013823A (en) 2010-07-22 2010-07-22 Transformer-free solar inverter topological structure based on MMC
PCT/CN2011/076853 WO2012010054A1 (en) 2010-07-22 2011-07-05 Modular multilevel converter-based transformerless solar power inverter topological structure

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012010054A1 (en) * 2010-07-22 2012-01-26 荣信电力电子股份有限公司 Modular multilevel converter-based transformerless solar power inverter topological structure
CN102738825A (en) * 2012-06-11 2012-10-17 合肥工业大学 Novel photovoltaic grid-connected system based on modularized multi-level converter
CN102769398A (en) * 2012-06-11 2012-11-07 合肥工业大学 Modularized multi-level converter for photovoltaic grid-connected system
CN103337873A (en) * 2013-06-09 2013-10-02 阳光电源股份有限公司 Photovoltaic power generation system
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
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
CN104167760A (en) * 2014-07-28 2014-11-26 湖南大学 Modularization multi-level photovoltaic grid connected system and control method thereof
CN104201726A (en) * 2014-07-31 2014-12-10 华为技术有限公司 UPS (Uninterrupted Power Supply) power supply system and current converting method thereof

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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
CN113270881A (en) * 2021-04-23 2021-08-17 华为技术有限公司 Energy storage system, balance control method of energy storage system and photovoltaic power generation system
CN113629693B (en) * 2021-06-30 2024-04-26 厦门和储能源科技有限公司 Direct-current direct access system of energy storage battery

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012010054A1 (en) * 2010-07-22 2012-01-26 荣信电力电子股份有限公司 Modular multilevel converter-based transformerless solar power inverter topological structure
CN102738825A (en) * 2012-06-11 2012-10-17 合肥工业大学 Novel photovoltaic grid-connected system based on modularized multi-level converter
CN102769398A (en) * 2012-06-11 2012-11-07 合肥工业大学 Modularized multi-level converter for photovoltaic grid-connected system
CN103337873A (en) * 2013-06-09 2013-10-02 阳光电源股份有限公司 Photovoltaic power generation system
CN103762874B (en) * 2014-01-28 2017-01-11 华南理工大学 Double-load three-phase nine-switch-block MMC inverter and control method thereof
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
CN103780113B (en) * 2014-01-28 2017-01-18 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
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
CN103904910B (en) * 2014-03-27 2016-09-21 华南理工大学 Single-phase six switches set MMC AC-AC changer and control methods thereof
CN104167760B (en) * 2014-07-28 2016-03-30 湖南大学 A kind of modular multilevel photovoltaic parallel in system and control method thereof
CN104167760A (en) * 2014-07-28 2014-11-26 湖南大学 Modularization multi-level photovoltaic grid connected system and control method thereof
CN104201726A (en) * 2014-07-31 2014-12-10 华为技术有限公司 UPS (Uninterrupted Power Supply) power supply system and current converting method thereof

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Application publication date: 20110413