CN102629757A - Centralized low voltage ride through correction system - Google Patents
Centralized low voltage ride through correction system Download PDFInfo
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- CN102629757A CN102629757A CN201210111748XA CN201210111748A CN102629757A CN 102629757 A CN102629757 A CN 102629757A CN 201210111748X A CN201210111748X A CN 201210111748XA CN 201210111748 A CN201210111748 A CN 201210111748A CN 102629757 A CN102629757 A CN 102629757A
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- 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]
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- 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
- Y02E40/30—Reactive power compensation
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Abstract
The invention relates to a centralized low voltage ride through correction system, which is characterized in that: an energy absorbing resistor, a controllable power electronic device and a high-speed switch are connected in parallel between a current collection bus and a transformer; the parallel circuit is connected in parallel with a bypass switch between the transformer and the current collection bus; a static var generator SVG is arranged on the current collection bus; when the system operates normally, the bypass switch is turned off and the high-speed switch is closed; when the system fails, the high-speed switch is turned off; failure current flows by the energy absorbing resistor; the size of equivalent impedance is adjusted by controlling the conduction angle of the controllable power electronic device; and meanwhile, the static var generator SVG automatically enters a constant voltage working mode to stabilize bus voltage. The centralized low voltage ride through correction system has the beneficial effects that: the system is arranged between the current collection bus of a wind power station or a photovoltaic power station and a low voltage side of a main transformer in a centralized way; the problem of low voltage ride through can be effectively solved; and the low voltage ride through reconstruction cost of the wind power station or the photovoltaic power station can be greatly reduced.
Description
Technical field
The invention belongs to field of power, be specifically related to a kind of low-voltage that is used for wind energy turbine set or photovoltaic plant current collection bus of concentrating and pass through corrective system.
Background technology
Low-voltage is passed through (LVRT); Finger is when wind-driven generator or photovoltaic electric station grid connection point voltage fall; Blower fan or photovoltaic plant can keep being incorporated into the power networks, and can certain reactive power be provided to electrical network, support power system restoration; Normal up to power system restoration, thus " passing through " this low-voltage time (zone).LVRT still keeps a kind of specific operation function requirement of being incorporated into the power networks to be incorporated into the power networks blower fan or photovoltaic plant when electric voltage dropping appears in electrical network.Have only when electric network electric voltage drop to be lower than the regulation curve and just to allow wind-driven generator or photovoltaic plant off-grid later on, when voltage curve during at sunk part, generator should provide reactive power.This just requires wind power generation or photovoltaic plant system to have stronger low voltage ride-through capability, can for electrical network the reactive power support be provided easily simultaneously.
The device of at present common solution low-voltage crossing problem all is that improvement cost is high to separate unit wind-driven generator or single photovoltaic DC-to-AC converter, and project progress is slow.
Summary of the invention
The purpose of this invention is to provide a kind of centralized low-voltage and pass through corrective system; This system installs concentratedly between wind energy turbine set or photovoltaic plant current collection bus and main transformer low-pressure side; The low-voltage crossing problem can be effectively solved, wind energy turbine set or photovoltaic plant improvement expenses can be significantly reduced.
For realizing above-mentioned purpose, the present invention realizes through following technical scheme:
Centralized low-voltage is passed through corrective system; It is characterized in that; Comprise static reacance generator SVG, energy-absorbing resistance, controlled power electronic device, speed-sensitive switch; Described energy-absorbing resistance, controlled power electronic device, speed-sensitive switch are connected between current collection bus and the transformer, and the by-pass switch between this parallel circuits and transformer, the current collection bus is connected in parallel; Static reacance generator SVG is installed on the described current collection bus; By-pass switch breaks off when system normally moves, and speed-sensitive switch is closed; Speed-sensitive switch breaks off when system breaks down, and fault current flows through energy-absorbing resistance, regulates the size of equiva lent impedance through controlling the controlled power electronic device angle of flow, and static reacance generator SVG gets into constant voltage operation mode stable busbar voltage automatically simultaneously.
Described controlled power electronic device is thyristor or full-controlled switch device.
Compared with prior art, the invention has the beneficial effects as follows:
This system concentrates on the setting of electrical network current collection bus, can effectively solve the low-voltage crossing problem, can significantly reduce wind energy turbine set or the photovoltaic plant low-voltage is passed through improvement expenses.
Description of drawings
Fig. 1 adopts the centralized low-voltage of thyristor to pass through the schematic diagram of corrective system;
Fig. 2 adopts the centralized low-voltage of full-control type device to pass through the schematic diagram of corrective system.
Embodiment
Do further explain below in conjunction with the accompanying drawing specific embodiments of the invention.
See Fig. 1, Fig. 2; Centralized low-voltage is passed through corrective system; Comprise static reacance generator SVG, energy-absorbing resistance, controlled power electronic device, speed-sensitive switch; Described energy-absorbing resistance, controlled power electronic device, speed-sensitive switch are connected between current collection bus and the transformer, and the by-pass switch between this parallel circuits and transformer, the current collection bus is connected in parallel; Static reacance generator SVG is installed on the described current collection bus, and described static reacance generator SVG is two, and a worker one is equipped with state.Described controlled power electronic device can be thyristor (or LTT) valve group, also can be the full-control type device, like GTO, IGBT, IEGT etc.
Centralized low-voltage is passed through the course of work of corrective system and is narrated as follows:
When system normally moves, tandem tap 1, tandem tap 2, speed-sensitive switch, isolation switch 12, isolation switch 22 closures, by-pass switch breaks off, and the ground connection disconnecting link breaks off, and static reacance generator SVG plays the effect to electric network reactive compensation.The controlled target of SVG mainly is to suppress transient voltage to change; The possible cause that transient voltage changes comprises and breaks down and load and significantly uprush; Characteristics are that voltage descends very soon, are likely dull and descend, and the result will be the transient voltage unstability and cause that low pressure discharges load.Stable and reduce low pressure and discharge load in order to keep transient voltage, require the SVG can the bigger capacity (comprising capacitive and perception) of dynamic compensation on the one hand, require SVG to have response speed faster on the other hand.
When line voltage falls; Controlled power electronic device control unit calculates the size of required compensating impedance; Regulate the size of equiva lent impedance through controlling the controlled power electronic device angle of flow, static reacance generator SVG gets into the constant voltage operation pattern automatically simultaneously, flows through the current value of resistance through adjusting; Regulate the voltage at resistance two ends, be adjusted in the normal range (NR) of rated voltage until the voltage of busbar voltage or main transformer low-pressure side.
When outside (between energy-absorbing resistance and the main transformer low-pressure side) fault of system took place, speed-sensitive switch broke off, controlled power electronic device conducting, and this process is accomplished in 4-10ms, and this moment, electric current all flow through controlled power electronic device.Controlled power electronic device control unit calculates the size of required compensating impedance according to gathering energy-absorbing resistance voltage and current signal, and compensativity is no more than at 80% o'clock, controls the controlled power electronic device angle of flow, compensation current collection busbar voltage.After compensativity continued 625ms above 80% o'clock, controlled power electronic device was closed.
When internal system fault (between energy-absorbing resistance and wind energy turbine set or the photovoltaic plant) took place, speed-sensitive switch broke off, controlled power electronic device conducting, and this process is accomplished in 4-10ms, and this moment, electric current all flow through controlled power electronic device.Controlled power electronic device control unit calculates the size of required compensating impedance according to gathering energy-absorbing resistance voltage and current signal, and compensativity is no more than at 80% o'clock, controls the controlled power electronic device angle of flow, the voltage of compensation main transformer low-pressure side.
Fault disappears or by after the isolation, speed-sensitive switch is closed, and controlled power electronic device is closed.Troubleshooting needs in 625ms, to accomplish.
If trouble duration surpasses 625ms, then need break off tandem tap 1.
During like energy-absorbing resistance and maintenance of controlled power electronic device or fault, by-pass switch is closed, isolation switch 11, isolation switch 21 closures, and tandem tap 1, tandem tap 2 break off, and isolation switch 12, isolation switch 22 break off.
Claims (3)
1. centralized low-voltage is passed through corrective system; It is characterized in that; Comprise static reacance generator SVG, energy-absorbing resistance, controlled power electronic device, speed-sensitive switch; Described energy-absorbing resistance, controlled power electronic device, speed-sensitive switch are connected between current collection bus and the transformer, and the by-pass switch between this parallel circuits and transformer, the current collection bus is connected in parallel; Static reacance generator is installed on the described current collection bus; By-pass switch breaks off when system normally moves, and speed-sensitive switch is closed; Speed-sensitive switch breaks off when system breaks down, and fault current flows through energy-absorbing resistance, regulates the size of equiva lent impedance through controlling the controlled power electronic device angle of flow, and static reacance generator SVG gets into constant voltage operation mode stable busbar voltage automatically simultaneously.
2. centralized low-voltage according to claim 1 is passed through corrective system, it is characterized in that, described controlled power electronic device is thyristor or full-controlled switch device.
3. centralized low-voltage according to claim 1 and 2 is passed through corrective system, it is characterized in that, the course of work that described centralized low-voltage is passed through corrective system is:
When system normally moved, speed-sensitive switch was closed, and by-pass switch breaks off;
When line voltage fell, speed-sensitive switch broke off, controlled power electronic device conducting; Controlled power electronic device control unit calculates the size of required compensating impedance; Regulate the size of equiva lent impedance through controlling the controlled power electronic device angle of flow; Static reacance generator SVG gets into the constant voltage operation pattern automatically simultaneously; Flow through the current value of resistance through adjusting, regulate the voltage at resistance two ends, be adjusted in the normal range (NR) of rated voltage until the voltage of busbar voltage or main transformer low-pressure side.
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| CN201210111748XA CN102629757A (en) | 2012-04-16 | 2012-04-16 | Centralized low voltage ride through correction system |
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| CN201210111748XA CN102629757A (en) | 2012-04-16 | 2012-04-16 | Centralized low voltage ride through correction system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578155A (en) * | 2013-10-29 | 2015-04-29 | 通用电气公司 | Power generation system and method with fault ride through capability |
| CN104659806A (en) * | 2013-11-20 | 2015-05-27 | 通用电气公司 | Power generation system and method with fault ride-through capability |
| CN116565963A (en) * | 2023-07-12 | 2023-08-08 | 西安高压电器研究院股份有限公司 | Distributed photovoltaic grid-connected system and low-voltage treatment method |
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| CN201623465U (en) * | 2009-09-23 | 2010-11-03 | 哈尔滨九洲电气股份有限公司 | Crowbar protective device of double-feed wind power converter |
| CN201726157U (en) * | 2010-08-24 | 2011-01-26 | 哈尔滨威瀚电气设备股份有限公司 | Low voltage ride through adjusting device for wind power generation |
| CN101969201A (en) * | 2010-09-17 | 2011-02-09 | 北京三得普华科技有限责任公司 | Dynamic voltage stabilizer for assisting wind driven generator in realizing low voltage ride through (LVRT) |
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2012
- 2012-04-16 CN CN201210111748XA patent/CN102629757A/en active Pending
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| CN201623465U (en) * | 2009-09-23 | 2010-11-03 | 哈尔滨九洲电气股份有限公司 | Crowbar protective device of double-feed wind power converter |
| CN101859157A (en) * | 2010-07-20 | 2010-10-13 | 哈尔滨威瀚电气设备股份有限公司 | Current compensation type alternating-current voltage stabilizer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104578155A (en) * | 2013-10-29 | 2015-04-29 | 通用电气公司 | Power generation system and method with fault ride through capability |
| EP2869426A1 (en) * | 2013-10-29 | 2015-05-06 | General Electric Company | Power generation system and method with fault ride through capability |
| CN104659806A (en) * | 2013-11-20 | 2015-05-27 | 通用电气公司 | Power generation system and method with fault ride-through capability |
| CN116565963A (en) * | 2023-07-12 | 2023-08-08 | 西安高压电器研究院股份有限公司 | Distributed photovoltaic grid-connected system and low-voltage treatment method |
| CN116565963B (en) * | 2023-07-12 | 2023-10-10 | 西安高压电器研究院股份有限公司 | Distributed photovoltaic grid-connected system and low-voltage treatment method |
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Application publication date: 20120808 |