CN203707797U - Power grid fault ride-through device for wind-driven generator - Google Patents

Power grid fault ride-through device for wind-driven generator Download PDF

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Publication number
CN203707797U
CN203707797U CN201320850663.3U CN201320850663U CN203707797U CN 203707797 U CN203707797 U CN 203707797U CN 201320850663 U CN201320850663 U CN 201320850663U CN 203707797 U CN203707797 U CN 203707797U
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China
Prior art keywords
wind
driven generator
switch
circuit
power switch
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CN201320850663.3U
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Chinese (zh)
Inventor
王江城
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Shanghai Haide Control System Co., Ltd.
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Zhejiang Haide New Energy Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/76Power conversion electric or electronic aspects

Abstract

The utility model discloses a power grid fault ride-through device for a wind-driven generator, which comprises a switch unit, a maintenance unit, a first detection circuit and a control unit. The switch unit and the maintenance unit are connected in parallel and then are connected in series between a wind-driven generator and a power grid access point. The control unit is configured to receive detection signals transmitted from the first detection circuit and output control signals to the switch unit and the maintenance unit. According to the technical scheme of the power grid fault ride-through device for the wind-driven generator, an existing wind-driven generator is free from being reconstructed, and the device is connected in series between the wind-driven generator and the power grid access point. In this way, the wind-driven generator is endowed with the power grid fault ride-through capability and is convenient in reconstruction. The device is applicable to stalling type wind-driven generators, double-fed type wind-driven generators, direct-drive wind-driven generators and other various wind-driven generators, thus being wide in application range.

Description

A kind of wind-driven generator electric network fault traversing device
Technical field
The utility model relates to wind power generation field, refers to especially a kind of wind-driven generator electric network fault traversing device.
Background technology
Wind power generation has become one of major way of generation of electricity by new energy, and Chinese Continental wind energy on the ground mainly concentrates on northwest, North, Northeast China, for the wind energy of utilizing as much as possible, reduce townie impact simultaneously, most wind power plants are located at remote districts, but the electrical network of remote districts a little less than, easily there are various short time electric network faults, such as line voltage rapid drawdown or voltage raise suddenly etc.Once there is short time electric network fault; will make wind-driven generator disorderly closedown; therefore; time and the electrical network short-duration failure that occurs causes wind-driven generator to move continuously; have a strong impact on the efficiency of wind-driven generator; for wind-driven generator can be moved continuously, need to make wind-driven generator possess the ability that short time electric network fault passes through.
In order to make wind-driven generator possess short time electric network fault ride-through capability, the control system that the normal scheme adopting is the existing wind-driven generator of transformation at present, but, the process complexity of this modification scheme, need current transformer, the controller etc. of wind-driven generator to be transformed simultaneously, the transformation cycle is long, and expense is high, and all will transform separately for Stall Type wind-driven generator, double feed wind power generator and direct-driving type wind power generation machine etc.In addition, also have a kind of reforming mode based on Dynamic Voltage Regulator (DVR), still, the topological structure complexity that this mode is used, need to increase other optional equipments, and equipment volume is large, and compensate function (such as frequency change, power grade) is restricted.
Utility model content
The purpose of this utility model is for the problems referred to above, provides a kind of and transforms conveniently, wind-driven generator electric network fault traversing device applied widely.
For achieving the above object, the utility model has adopted following technical proposal:
A kind of wind-driven generator electric network fault traversing device, comprise switch element, maintain unit, the first testing circuit and control unit, described switch element with maintain unit and be serially connected between wind-driven generator and electrical network access point after in parallel, described control unit receives the detection signal of the first testing circuit, and to switch element with maintain unit output control signal.
Above-mentioned wind-driven generator electric network fault traversing device, wherein, described switch element comprises switching circuit, described switching circuit comprises power switch T1 and power switch T2, and power switch T1 is connected with power switch T2 reverse parallel connection.
Above-mentioned wind-driven generator electric network fault traversing device, wherein, described power switch T1 and power switch T2 are half control type switch, and described switch element also comprises the resonant circuit in parallel with switching circuit.
Above-mentioned wind-driven generator electric network fault traversing device, wherein, described resonant circuit comprises capacitor C 1, resistance R 2, inductance L 1 and the thyristor T3 of series connection successively.
Above-mentioned wind-driven generator electric network fault traversing device, wherein, described power switch T1 and power switch T2 are full-controlled switch.
Above-mentioned wind-driven generator electric network fault traversing device, wherein, described in maintain rectification circuit and the inverter circuit that unit comprises mutual series connection, and between described rectification circuit and inverter circuit, also connect and unload electric discharge road and capacitor C.
Compared with prior art, the utility model has the advantage of: do not need to transform existing wind-driven generator, only disclosed the utility model device need to be connected in series between wind-driven generator and electrical network access point, just can make wind-driven generator have electric network fault ride-through capability, transformation is convenient; Be applicable to the various wind-driven generators such as Stall Type wind-driven generator, double feed wind power generator, direct-driving type wind power generation machine, applied widely.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the utility model wind-driven generator electric network fault traversing device;
Fig. 2 is the circuit diagram of the utility model wind-driven generator electric network fault traversing device;
Fig. 3 is the workflow diagram of the utility model wind-driven generator electric network fault traversing device.
Wherein: 1. control unit, 2. the first testing circuit, 3. the second testing circuit, 4. maintains unit, 41. rectification circuits, 42. unload electric discharge road, 43. inverter circuits, 5. switch element, 51. resonant circuits, 52. switching circuits, 6. electrical network access point, 7. wind-driven generator.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, the every other embodiment that those of ordinary skills obtain under the prerequisite of not making creative work, belongs to the scope that the utility model is protected.
As shown in Figure 1, the wind-driven generator electric network fault traversing device that the utility model provides, comprise switch element 5, maintain unit 4, the first testing circuit 2 and control unit 1, described switch element 1 with maintain unit 4 and be serially connected between wind-driven generator 7 and electrical network access point 6 after in parallel, the first testing circuit 2 detection of grid frequencies, line voltage and power network current, control unit 1 receives the detection signal of the first testing circuit 2, and according to the detection signal receiving to switch element 5 with maintain unit 4 and export control signal.In addition, the device that the utility model provides is also provided with the second testing circuit 3 that detects wind power generation acc power and electric current.
As shown in Figure 2, switch element 5 comprises switching circuit 52, and switching circuit 52 comprises power switch T1 and power switch T2, and power switch T1 is connected with power switch T2 reverse parallel connection; Described power switch T1 and power switch T2 can be full-controlled switch or half control type switch.If power switch T1 and power switch T2 are half control type switch, switch element 5 also should comprise the resonant circuit in parallel with switching circuit 52 51, and resonant circuit 51 comprises capacitor C 1, resistance R 2, inductance L 1 and the thyristor T3 of series connection successively.Because resonant circuit 51 is in the time that half control type switch turn-offs, make that its electric current is instantaneous to be zero and to maintain a period of time, therefore the parameter value of capacitor C 1, resistance R 2 and inductance L 1 should mate with the switching speed of switching circuit 52.Maintain rectification circuit 41 and inverter circuit 43 that unit 4 comprises mutual series connection, the three-phase bridge rectifier circuit of rectification circuit 41 for comprising 3 brachium pontis, the three-phase inverter bridge circuit of inverter circuit 43 for comprising 3 brachium pontis, and between described rectification circuit 41 and inverter circuit 43, also connect and unload electric discharge road 42 and capacitor C, unload electric discharge road 42 and formed by power semiconductor S and resistance R.In addition, be harmonic carcellation, the input side of rectification circuit 41 is provided with the LC filter circuit being made up of inductance L 2 and capacitor C 2; The outlet side of described inverter circuit 43 is provided with the LC filter circuit being made up of inductance L 3 and capacitor C 3, or the LRC filter circuit being made up of inductance L 3, capacitor C 3 and resistance R 3.
As shown in Figure 3, the course of work of the electric network fault traversing device that the utility model provides is: the first testing circuit 2 detection of grid frequencies, line voltage and power network current, and to control unit 1 output detection signal, control unit 1 receives the detection signal of the first testing circuit 2, and judges whether fault of electrical network according to this detection signal.If mains frequency undulating value >5% electrical network rated frequency (50Hz) or voltage ripple of power network value >10% electrical network rated voltage (690V), judge electric network fault; Otherwise, judge that electrical network is normal.If electrical network is normal, control unit 1 is exported control signal makes switch element 5 in closure state, and controls and maintain unit 5 and quit work, so wind-driven generator 7 is connected backward electrical network transmission of electric energy with electrical network tie point 6 through switch element 5.If electric network fault, control unit 1 is exported control signal makes switch element 5 in off state, make wind-driven generator 7 with electrical network tie point 6 by the disconnection that is connected of switch element 5, and control and maintain 43 outputs of inverter circuit in unit 4 and signal that normally electrical network is identical; Then, control unit 1 judges whether balance of electrical network according to the detection signal of the first testing circuit 2, if grid balance, control unit 1 is controlled and maintained unit 4 and carry active power to electrical network, make the power delivery that wind-driven generator 7 produces arrive electrical network, realized wind-driven generator 7 and moved continuously; If unbalanced power supply, control unit 1 is controlled and is maintained unit 4 to electrical network conveying reactive power, although the electric energy that at this moment wind-driven generator 7 produces is not transported to electrical network, has realized wind-driven generator 7 and has moved continuously, has improved the operational efficiency of wind-driven generator 7.Like this, even if short-duration failure occurs often to occur electrical network, wind-driven generator 7 is normal operation continuously in the time of electric network fault, realizes electric network fault and passes through.
In addition, when the power network current that the first testing circuit 2 detects abnormal, or power or the current anomaly of the wind-driven generator 7 that detects of the second testing circuit 3, the device of controlling the utility model and providing is provided control unit 1.
Compared with prior art, the beneficial effects of the utility model are: do not need to transform existing wind-driven generator 7, only disclosed the utility model device need to be connected in series between wind-driven generator 7 and electrical network access point 6, just can make wind-driven generator 7 have electric network fault ride-through capability, transformation is convenient; Be applicable to the various wind-driven generators such as Stall Type wind-driven generator, double feed wind power generator, direct-driving type wind power generation machine, applied widely.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.

Claims (6)

1. a wind-driven generator electric network fault traversing device, it is characterized in that, comprise switch element, maintain unit, the first testing circuit and control unit, described switch element with maintain unit and be serially connected between wind-driven generator and electrical network access point after in parallel, described control unit receives the detection signal of the first testing circuit, and to switch element with maintain unit output control signal.
2. wind-driven generator electric network fault traversing device according to claim 1, it is characterized in that, described switch element comprises switching circuit, and described switching circuit comprises power switch T1 and power switch T2, and power switch T1 is connected with power switch T2 reverse parallel connection.
3. wind-driven generator electric network fault traversing device according to claim 2, is characterized in that, described power switch T1 and power switch T2 are half control type switch, and described switch element also comprises the resonant circuit in parallel with switching circuit.
4. wind-driven generator electric network fault traversing device according to claim 3, is characterized in that, described resonant circuit comprises capacitor C 1, resistance R 2, inductance L 1 and the thyristor T3 of series connection successively.
5. wind-driven generator electric network fault traversing device according to claim 2, is characterized in that, described power switch T1 and power switch T2 are full-controlled switch.
6. wind-driven generator electric network fault traversing device according to claim 1, is characterized in that, described in maintain rectification circuit and the inverter circuit that unit comprises mutual series connection, and between described rectification circuit and inverter circuit, also connect and unload electric discharge road and capacitor C.
CN201320850663.3U 2013-12-20 2013-12-20 Power grid fault ride-through device for wind-driven generator Active CN203707797U (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103701149A (en) * 2013-12-20 2014-04-02 浙江海得新能源有限公司 Wind power generator grid fault ride-through device and method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103701149A (en) * 2013-12-20 2014-04-02 浙江海得新能源有限公司 Wind power generator grid fault ride-through device and method thereof

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Date Code Title Description
CB03 Change of inventor or designer information

Inventor after: Guo Mengrong

Inventor after: Zheng Yanbo

Inventor after: Wang Jiangcheng

Inventor after: Cai Jianzhong

Inventor after: Chen Chaofeng

Inventor after: Zhang Yongfeng

Inventor after: Ji Jianqiang

Inventor after: Tang Ziqian

Inventor after: Chen Lin

Inventor after: Lv Huaiming

Inventor after: Chou Jianxi

Inventor before: Wang Jiangcheng

GR01 Patent grant
TR01 Transfer of patent right

Effective date of registration: 20140619

Address after: 201114, No. 777, Chun Chun Road, Shanghai, Minhang District

Patentee after: Shanghai Haide Control System Co., Ltd.

Address before: 314500 Tongxiang City, Jiaxing Province, near the South Ring Road No. 1320, No.

Patentee before: Zhejiang Haide New Energy Co., Ltd.

ASS Succession or assignment of patent right

Owner name: SHANGHAI HI-TECH CONTROL SYSTEM CO., LTD.

Free format text: FORMER OWNER: ZHEJIANG HAIDE NEW ENERGY CO., LTD.

Effective date: 20140619

C14 Grant of patent or utility model
C41 Transfer of patent application or patent right or utility model
C53 Correction of patent for invention or patent application
COR Change of bibliographic data

Free format text: CORRECT: INVENTOR; FROM: WANG JIANGCHENG TO: GUO MENGRONG CAI JIANZHONG CHEN CHAOFENG ZHANG YONGFENG JI JIANQIANG TANG ZIQIAN CHEN LIN LV HUAIMING CHOU JIANXI ZHENG YANBO WANG JIANGCHENG

Free format text: CORRECT: ADDRESS; FROM: 314500 JIAXING, ZHEJIANG PROVINCE TO: 201114 MINHANG, SHANGHAI