CN101710716A - Grid-connected inverter capable of reducing electrolytic capacitance - Google Patents

Grid-connected inverter capable of reducing electrolytic capacitance Download PDF

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Publication number
CN101710716A
CN101710716A CN200910212615A CN200910212615A CN101710716A CN 101710716 A CN101710716 A CN 101710716A CN 200910212615 A CN200910212615 A CN 200910212615A CN 200910212615 A CN200910212615 A CN 200910212615A CN 101710716 A CN101710716 A CN 101710716A
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China
Prior art keywords
converter
way
output
sub
bus
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Pending
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CN200910212615A
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Chinese (zh)
Inventor
张犁
吴红飞
邢岩
王翀
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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Priority to CN200910212615A priority Critical patent/CN101710716A/en
Publication of CN101710716A publication Critical patent/CN101710716A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a grid-connected inverter capable of reducing electrolytic capacitance, belonging to the field of inverters in power electronic converters. The inverter comprises a direct current (DC) power source, a DC/DC converter, a DC/AC converter, a bidirectional DC/DC converter, a DC-link capacitor and an energy storage capacitor. The output end of the DC power source is connected with the DC/DC converter in series, then is connected with the DC-link capacitor in parallel and finally is connected with the bidirectional input end of the bidirectional DC/DC converter and the input end of the DC/AC converter respectively. The bidirectional output end of the bidirectional DC/DC converter is connected with the two ends of the energy storage capacitor and the output end of the DC/AC converter is connected into the grid. When the instantaneous output power of the DC/AC converter is greater than or smaller than that of the DC power source, the energy storage capacitor correspondingly outputs or absorbs power. The grid-connected inverter uses less electrolytic capacitance as far as possible or does not use electrolytic capacitance and the service life of the whole inverter is lengthened.

Description

Can reduce the combining inverter of electrochemical capacitor
Technical field
The present invention relates to a kind of inverter, relate in particular to a kind of combining inverter that can reduce electrochemical capacitor, belong to the inverter field in the Technics of Power Electronic Conversion device.
Background technology
Because the global energy and economic crisis, the main developed country in the world all begins to pay attention to the utilization research of regenerative resource, has more significance as the distributed generation system of studying regenerative resources such as solar energy, wind energy.In grid-connected photovoltaic system, because the photovoltaic array power output is a smooth direct current, and the combining inverter power output presents periodically pulsing, therefore in the existing two-stage type grid-connected system, usually need the instantaneous power of enough jumbo capacitance compensation DC/AC converter power output and DC/AC converter power output poor between DC/DC converter and the DC/AC converter, reduce the pulsation of photovoltaic array power output, improve the tracking effect of photovoltaic array maximum power point.Because the capacity of electric capacity is very big, need usually to use electrochemical capacitor, yet electrochemical capacitor along with the increasing of operating time, electrolyte can slowly volatilize, capacitance can slowly reduce, thereby influences filter effect, reduces the complete machine useful life of combining inverter.
Therefore, in the photovoltaic generating system of reality,, improve the complete machine useful life of combining inverter, all can derate use usually, increased the cost of system for electrochemical capacitor in order to guarantee filter effect.
Summary of the invention
The present invention is directed to the defective that combining inverter in the background technology exists, for improving combining inverter complete machine useful life, reducing system cost and propose a kind of combining inverter that can reduce electrochemical capacitor.
The combining inverter that can reduce electrochemical capacitor of the present invention, its structure comprises: DC power supply, DC/DC converter, DC/AC converter, two-way DC/DC converter, dc-link capacitance and storage capacitor, wherein: the output serial connection DC/DC converter of DC power supply connects the two-way input of two-way DC/DC converter and the input of DC/AC converter respectively behind the parallel connection direct bus capacitor again, the two-way output of two-way DC/DC converter connects the two ends of storage capacitor, and the output of DC/AC converter is connected into electrical network.
The present invention adopts storage capacitor to replace the filter action of dc-link capacitance by two-way DC/DC converter, allow storage capacitor voltage wide fluctuations, reduce the mains ripple of dc bus, thereby reduce the capacity of dc-link capacitance, make combining inverter when smaller power, not use electrochemical capacitor, when more high-power, reduce the use of electrochemical capacitor, prolonged the useful life of combining inverter complete machine, reduced the cost of system.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the structural representation of the embodiment of the invention when adopting centralized inversion.
Fig. 3 is that the embodiment of the invention adopts the distributed structural representation when in parallel of dc bus altogether.
Structural representation when Fig. 4 is distributed being incorporated into the power networks of embodiment of the invention employing.
Fig. 5 is the structural circuit schematic diagram of the embodiment of the invention.
Among Fig. 1～Fig. 5: 1 is DC power supply; 2 is the DC/DC converter; 3 is the DC/AC converter; 4 is two-way DC/DC converter; C 1Be dc-link capacitance; C 2Be storage capacitor.
Fig. 6 is the control principle figure of Fig. 5 embodiment.
Fig. 7 is the waveform schematic diagram of Fig. 5 embodiment.
Among Fig. 6, Fig. 7: I DCAverage current for the output of Boost DC/DC converter; I INVInput current for full-bridge inverter; I APFFor the input current of the two-way DC/DC converter of Buck-Boost (with dc-link capacitance C 1Flow into storage capacitor C 2Direction for just); G S1Be switching tube S 1Drive signal; G S2Be switching tube S 2Drive signal; u C1Be dc-link capacitance C 1On voltage; Δ u C1Be dc-link capacitance C 1On voltage variety; u C2Be storage capacitor C 2On voltage; Δ u C2Be storage capacitor C 2On voltage variety; K and-k is proportional gain; G CBe the error adjuster; A 1And A 2Be respectively comparator 1 and comparator 2; v StBe the triangular carrier signal.
Embodiment
Structure of the present invention comprises DC power supply 1, DC/DC converter 2, DC/AC converter 3, two-way DC/DC converter 4, dc-link capacitance C as shown in Figure 1 1With storage capacitor C 2, wherein: the output serial connection DC/DC converter 2 of DC power supply 1 is parallel connection direct bus capacitor C again 1After connect the two-way input of two-way DC/DC converter 4 and the input of DC/AC converter 3 respectively, the two-way output of two-way DC/DC converter 4 connects storage capacitor C 2Two ends, the output of DC/AC converter 3 is connected into AC network.When the instantaneous power of DC/AC converter 3 output during greater than the instantaneous power of DC power supply 1 output, storage capacitor C 2By two-way DC/DC converter 4 power outputs, its size equals the difference of DC/DC converter 2 and DC/AC converter 3 power output instantaneous values; When the instantaneous power of DC/AC converter 3 output during less than the instantaneous power of DC power supply 1 output, storage capacitor C 2By two-way DC/DC converter 4 absorbed powers, its size equals the difference of DC/DC converter 2 and DC/AC converter 3 power output instantaneous values.Described DC power supply 1 can be direct voltage source, also can be for various generation of electricity by new energy devices, as Blast Furnace Top Gas Recovery Turbine Unit (TRT) such as solar energy, wind energies.
Be the structure chart of the present invention when adopting centralized inversion as shown in Figure 2, among the figure: DC power supply 1 is made up of n sub-DC power supply, and each sub-DC power supply all adopts photovoltaic array, and DC/DC converter 2 is made up of n sub-DC/DC converter, n is the natural number greater than 1, dc-link capacitance C 1Be common DC bus, the output of each sub-DC power supply is connected into dc bus after all being connected in series a sub-DC/DC converter, and the two-way output of two-way DC/DC converter 4 connects storage capacitor C 2Two ends, the two-way input of two-way DC/DC converter 4 is connected into dc bus, the input of DC/AC converter 3 inserts dc bus, the output of DC/AC converter 3 is connected into the electrical network bus, described DC/AC converter 3 adopts centralized DC/AC converter.
Be that the present invention adopts the distributed structure chart when in parallel of common dc bus as shown in Figure 3, among the figure: DC power supply 1 is made up of n sub-DC power supply, each sub-DC power supply all adopts photovoltaic array, DC/DC converter 2 is made up of n sub-DC/DC converter, DC/AC converter 3 is made up of n sub-DC/AC converter, n is the natural number greater than 1, dc-link capacitance C 1Be common DC bus, the output of each sub-DC power supply is connected into dc bus after all being connected in series a sub-DC/DC converter, the two-way output of two-way DC/DC converter 4 connects the two ends of storage capacitor C2, the two-way input of two-way DC/DC converter 4 is connected into dc bus, the input of each sub-DC/AC converter all inserts dc bus, and the output of each sub-DC/AC converter all is connected into the electrical network bus.
Be the structure chart of the present invention when adopting distributed being incorporated into the power networks as shown in Figure 4, promptly be connected into the electrical network bus simultaneously and constitute by a plurality of inverter structures as shown in Figure 1.
Be the structural circuit schematic diagram of the embodiment of the invention as shown in Figure 5, among the figure: DC power supply 1 adopts photovoltaic array, DC/DC converter 2 adopts Boost DC/DC converter, and DC/AC converter 3 adopts full-bridge converter, and two-way DC/DC converter 4 adopts by two switching tube S 1And S 2And storage capacitor L 1The two-way DC/DC converter of Buck-Boost that constitutes also comprises dc-link capacitance C 1With storage capacitor C 2, the overall structure of this figure is identical with Fig. 1 structure.
Be the control principle figure of Fig. 5 embodiment as shown in Figure 6.The input current I of full-bridge inverter INVAverage current I with the output of Boost DC/DC converter DCIt is given as the electric current of the two-way DC/DC converter of Buck-Boost to subtract each other the back negate, again with the input current signal I of the two-way DC/DC converter of Buck-Boost APFThrough error adjuster G CAfter obtain modulation signal, this modulation signal pass through respectively proportional gain k and-k after with triangular carrier signal v StFriendship obtains switching tube S after cutting 1And S 2Drive signal G S1And G S2
Be the waveform schematic diagram of Fig. 5 embodiment as shown in Figure 7.Input current I when full-bridge inverter INVAverage current I greater than the output of Boost DC/DC converter DCThe time, storage capacitor C 2Release energy by the two-way DC/DC converter of Buck-Boost, provide the instantaneous power of full-bridge converter and Boost DC/DC converter poor, the two-way DC/DC converter of Buck-Boost is operated in the Buck pattern, switching tube S 1Body diode work, switching tube S 2High frequency chopping; Input current I when full-bridge inverter INVAverage current I less than the output of BoostDC/DC converter DCThe time, storage capacitor C 2The instantaneous power that absorbs full-bridge converter and Boost DC/DC converter by the two-way DC/DC converter of Buck-Boost is poor, and the two-way DC/DC converter of Buck-Boost is operated in the Boost pattern, switching tube S 1High frequency chopping, switching tube S 2Body diode work.Institute is so that dc-link capacitance C 1On voltage u C1Have only less pulsation, when small-power, can not use electrochemical capacitor, when more high-power, can reduce the use of electrochemical capacitor; Storage capacitor C 2On voltage u C2Greater than dc-link capacitance C 1On voltage u C1, and storage capacitor C 2On voltage u C2Fluctuation range is bigger, and the appearance value that therefore needs is less, can not use electrochemical capacitor when small-power, can reduce the use of electrochemical capacitor when more high-power.

Claims (5)

1. the combining inverter that can reduce electrochemical capacitor is characterized in that: comprise DC power supply (1), DC/DC converter (2), DC/AC converter (3), two-way DC/DC converter (4), dc-link capacitance (C 1) and storage capacitor (C 2), wherein: the output serial connection DC/DC converter (2) of DC power supply (1) is parallel connection direct bus capacitor (C again 1) after connect the two-way input of two-way DC/DC converter (4) and the input of DC/AC converter (3) respectively, the two-way output of two-way DC/DC converter (4) connects storage capacitor (C 2) two ends, the output of DC/AC converter (3) is connected into electrical network.
2. the combining inverter that can reduce electrochemical capacitor according to claim 1, it is characterized in that: described DC power supply (1) is made up of n sub-DC power supply, described DC/DC converter (2) is made up of n sub-DC/DC converter, and n is the natural number greater than 1, described dc-link capacitance (C 1) be dc bus, the output of each sub-DC power supply is connected into dc bus after all being connected in series a sub-DC/DC converter, and the two-way output of two-way DC/DC converter (4) connects storage capacitor (C 2) two ends, the two-way input of two-way DC/DC converter (4) is connected into dc bus, the input of DC/AC converter (3) inserts dc bus, the output of DC/AC converter (3) is connected into electrical network.
3. the combining inverter that can reduce electrochemical capacitor according to claim 1, it is characterized in that: described DC power supply (1) is made up of n sub-DC power supply, described DC/DC converter (2) is made up of n sub-DC/DC converter, described DC/AC converter (3) is made up of n sub-DC/AC converter, n is the natural number greater than 1, described dc-link capacitance (C 1) be dc bus, the output of each sub-DC power supply is connected into dc bus after all being connected in series a sub-DC/DC converter, and the two-way output of two-way DC/DC converter (4) connects storage capacitor (C 2) two ends, the two-way input of two-way DC/DC converter (4) is connected into dc bus, the input of each sub-DC/AC converter all inserts dc bus, the output of each sub-DC/AC converter all is connected into electrical network.
4. the combining inverter that can reduce electrochemical capacitor according to claim 1 is characterized in that: described DC power supply (1) is direct voltage source or renewable energy power generation device.
5. the combining inverter that can reduce electrochemical capacitor according to claim 2 is characterized in that: described DC/AC converter (3) adopts centralized DC/AC converter.
CN200910212615A 2009-11-13 2009-11-13 Grid-connected inverter capable of reducing electrolytic capacitance Pending CN101710716A (en)

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Cited By (24)

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CN101976852A (en) * 2010-11-02 2011-02-16 深圳市合兴加能科技有限公司 Photovoltaic power supply system structure and method thereof
CN102130618A (en) * 2011-03-24 2011-07-20 江苏兆能电子有限公司 Inverter system using independent energy-storing capacitor module
CN102149239A (en) * 2010-12-06 2011-08-10 南京航空航天大学 LED (light-emitting diode) string current-equalizing circuit and control method
CN102148509A (en) * 2011-05-13 2011-08-10 王红卫 Grid-connected inverter for optimizing minimum unit of solar cell
CN102270930A (en) * 2010-06-04 2011-12-07 法国原子能源和替代能源委员会 Converter circuit and electronic system comprising such a circuit
CN102522767A (en) * 2011-11-17 2012-06-27 中电普瑞科技有限公司 Schedulable-type photovoltaic energy storage grid-connected power generation system and operating method thereof
WO2012119232A1 (en) * 2011-03-09 2012-09-13 Solantro Semiconductor Corp. Inverter having extended lifetime dc-link capacitors
CN102738824A (en) * 2011-04-15 2012-10-17 Abb研究有限公司 Reconfigurable power converters, systems and plants
WO2013097526A1 (en) * 2011-12-28 2013-07-04 艾默生网络能源有限公司 Dc/dc circuit for uninterruptible power supply
CN103280795A (en) * 2013-04-27 2013-09-04 嘉善明世电力科技有限公司 Direct-current bus photoelectric real-time convergence system and control method
CN103608993A (en) * 2011-04-05 2014-02-26 通用电气能源能量变换技术有限公司 Drive chain comprising a doubly-fed electric machine and an inverter controlled according to a law limiting the delivered active power
US20140085935A1 (en) * 2012-09-27 2014-03-27 Samsung Sdi Co., Ltd., Power conversion device
CN103731061A (en) * 2012-10-10 2014-04-16 江苏固德威电源科技有限公司 Both-way energy storing inverter topological structure
CN103986223A (en) * 2014-04-11 2014-08-13 矽力杰半导体技术(杭州)有限公司 Energy storage power supply circuit and continuous power supply method using same
CN104393583A (en) * 2014-11-27 2015-03-04 瓮福（集团）有限责任公司 Short-circuit fault current limiting device
CN104917199A (en) * 2014-03-14 2015-09-16 长沙理工大学 AC DC micro grid connection flexible serial parallel multifunctional energy controller
CN106300408A (en) * 2015-06-04 2017-01-04 周锡卫 Photovoltaic inverter with alternating current-direct current dynamic adjustment function
CN104901578B (en) * 2014-03-07 2017-10-27 长沙理工大学 The single-phase flexible connection in series-parallel power interface of distributed photovoltaic power
CN109274281A (en) * 2017-07-12 2019-01-25 丰郅(上海)新能源科技有限公司 The inhibition system and suppressing method of photovoltaic combining inverter low frequency input pulsating current
CN109672166A (en) * 2017-10-17 2019-04-23 丰郅(上海)新能源科技有限公司 Power optimized system and its optimization method
CN112803570A (en) * 2021-03-22 2021-05-14 阳光电源股份有限公司 Energy storage system and control method thereof
CN114665510A (en) * 2022-05-27 2022-06-24 西安海联石化科技有限公司 Photoelectric energy source direct current power supply pumping unit well group energy-saving control system
CN116301184A (en) * 2023-03-11 2023-06-23 合肥仙湖半导体科技有限公司 Solar cell maximum power point tracking circuit and method
CN117452078A (en) * 2023-12-26 2024-01-26 锦浪科技股份有限公司 Capacitance attenuation prediction method of busbar electrolytic capacitor and photovoltaic system

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CN102270930A (en) * 2010-06-04 2011-12-07 法国原子能源和替代能源委员会 Converter circuit and electronic system comprising such a circuit
CN102270930B (en) * 2010-06-04 2014-04-16 法国原子能源和替代能源委员会 Converter circuit and electronic system comprising such a circuit
CN101976852A (en) * 2010-11-02 2011-02-16 深圳市合兴加能科技有限公司 Photovoltaic power supply system structure and method thereof
CN102149239A (en) * 2010-12-06 2011-08-10 南京航空航天大学 LED (light-emitting diode) string current-equalizing circuit and control method
WO2012119232A1 (en) * 2011-03-09 2012-09-13 Solantro Semiconductor Corp. Inverter having extended lifetime dc-link capacitors
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CN103518318A (en) * 2011-03-09 2014-01-15 索兰特罗半导体公司 Inverter having extended lifetime dc-link capacitors
CN102130618A (en) * 2011-03-24 2011-07-20 江苏兆能电子有限公司 Inverter system using independent energy-storing capacitor module
US9356533B2 (en) 2011-04-05 2016-05-31 Ge Energy Power Conversion Technology Drive train comprising a doubly-fed electric machine and an inverter controlled according to a law limiting the delivered active power
CN103608993A (en) * 2011-04-05 2014-02-26 通用电气能源能量变换技术有限公司 Drive chain comprising a doubly-fed electric machine and an inverter controlled according to a law limiting the delivered active power
CN102738824A (en) * 2011-04-15 2012-10-17 Abb研究有限公司 Reconfigurable power converters, systems and plants
CN102738824B (en) * 2011-04-15 2016-10-19 Abb研究有限公司 Reconfigurable power inverter, system and power plant
CN102148509A (en) * 2011-05-13 2011-08-10 王红卫 Grid-connected inverter for optimizing minimum unit of solar cell
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WO2013097526A1 (en) * 2011-12-28 2013-07-04 艾默生网络能源有限公司 Dc/dc circuit for uninterruptible power supply
US20140085935A1 (en) * 2012-09-27 2014-03-27 Samsung Sdi Co., Ltd., Power conversion device
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CN106300408B (en) * 2015-06-04 2018-10-23 周锡卫 Photovoltaic inverter with alternating current-direct current dynamic adjustment function
CN109274281B (en) * 2017-07-12 2021-04-02 丰郅(上海)新能源科技有限公司 Suppression system and suppression method for low-frequency input pulsating current of photovoltaic grid-connected inverter
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CN109672166A (en) * 2017-10-17 2019-04-23 丰郅(上海)新能源科技有限公司 Power optimized system and its optimization method
CN112803570A (en) * 2021-03-22 2021-05-14 阳光电源股份有限公司 Energy storage system and control method thereof
CN114665510A (en) * 2022-05-27 2022-06-24 西安海联石化科技有限公司 Photoelectric energy source direct current power supply pumping unit well group energy-saving control system
CN116301184A (en) * 2023-03-11 2023-06-23 合肥仙湖半导体科技有限公司 Solar cell maximum power point tracking circuit and method
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CN117452078A (en) * 2023-12-26 2024-01-26 锦浪科技股份有限公司 Capacitance attenuation prediction method of busbar electrolytic capacitor and photovoltaic system
CN117452078B (en) * 2023-12-26 2024-04-05 锦浪科技股份有限公司 Capacitance attenuation prediction method of busbar electrolytic capacitor and photovoltaic system

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Application publication date: 20100519