WO2011082512A1 - 低电压穿越控制方法 - Google Patents

低电压穿越控制方法 Download PDF

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Publication number
WO2011082512A1
WO2011082512A1 PCT/CN2010/001689 CN2010001689W WO2011082512A1 WO 2011082512 A1 WO2011082512 A1 WO 2011082512A1 CN 2010001689 W CN2010001689 W CN 2010001689W WO 2011082512 A1 WO2011082512 A1 WO 2011082512A1
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WIPO (PCT)
Prior art keywords
circuit
grid
stator
control
voltage
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PCT/CN2010/001689
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English (en)
French (fr)
Inventor
苏丽营
荆海斌
杨松
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华锐风电科技(集团)股份有限公司
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Priority to AU2010341387A priority Critical patent/AU2010341387A1/en
Priority to IN5890DEN2012 priority patent/IN2012DN05890A/en
Priority to BR112012013959A priority patent/BR112012013959A2/pt
Priority to CA2784306A priority patent/CA2784306C/en
Priority to US13/514,499 priority patent/US20120280665A1/en
Priority to EP10841856.7A priority patent/EP2525464A4/en
Publication of WO2011082512A1 publication Critical patent/WO2011082512A1/zh

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Classifications

    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
    • 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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/007—Control circuits for doubly fed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/06—Details with automatic reconnection
    • H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
    • 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
    • H02J3/381—Dispersed generators
    • 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

Definitions

  • the invention relates to wind power generation technology, in particular to a low voltage ride through control scheme. Background technique
  • the wind power generation equipment control device will disconnect the wind power generator when the grid voltage drop is detected, even if the wind power generator is disconnected from the power grid.
  • the thyristor triggers protection of the inverter when it is limited, but it does not have low voltage ride-through function.
  • the doubly-fed induction generators with LVRT function mostly use the low-voltage bypass system to adopt the Crowbar active crowbar technology on the rotor side.
  • Commonly used are the IGBT type Crowbar circuit, the hybrid bridge Crowbar circuit, and the Crowbar circuit with the shunt resistor.
  • these control technologies have the added cost of adding new protection devices, and the excitation converter and rotor windings are protected when the grid fails, but this The unit operating in the induction motor mode will absorb a large amount of reactive power from the system, which will lead to further deterioration of the grid voltage stability. Summary of the invention
  • the main object of the present invention is to provide a low voltage ride through control scheme for a doubly fed induction generator, by which the stability of the grid voltage can be effectively ensured.
  • the low voltage ride through control scheme in the present invention includes the following steps:
  • the control circuit further controls the circuit breaker of the shunt circuit in the Crowbar protection circuit to first open and close again The intergranular tube is automatically disconnected, thereby restoring the protection function of the shunt circuit; 5) maintaining the above state until the control circuit detects the grid voltage recovery, and quickly causes the generator synchronous control circuit breaker to close and resume normal operation.
  • the inverter and the grid-side inverter, the DC bus voltage monitored in the step 1) is the inverter-side circuit breaker of the grid-side inverter that is normally closed.
  • step 1) the voltage monitoring unit for monitoring the DC bus voltage in the control circuit.
  • the shunt protection circuit in the Crowbar protection circuit is used for shunt protection in step 2).
  • the flow circuit includes a rectifier bridge and a release resistor connected in series with the positive and negative poles of the thyristor, and a circuit breaker for the contact.
  • the stator control unit for controlling the disconnection of the stator breaker in the control circuit in the step 3).
  • the control circuit used in the step 4) is for controlling the chopper switch control unit to further control the circuit breaker to be turned off first and then closed.
  • the low voltage ride through control scheme of the invention can effectively improve the grid connection time and power generation amount of the wind power generator, effectively reduce the damage of the frequency converter group, reduce the reactive power of the wind turbine, instantaneously, the power of the motor, absorb the reactive power, and absorb the reactive power from the power grid.
  • the grid provides strong support to enhance the stability of the grid.
  • FIG. 1 is a circuit diagram of a low voltage ride through control scheme in the present invention
  • Figure 2 is a circuit diagram of a low voltage ride through control scheme of the present invention, showing a block diagram of the control circuit. detailed description
  • the low-voltage ride-through control scheme for a variable-speed constant-frequency induction wind turbine is realized by a system including a stator breaker 1
  • the grid side circuit breaker 2 can be used to control the entire inverter group off-line when necessary.
  • the stator circuit breaker 1 is connected between the grid 12 and the stator of the wind turbine G.
  • the stator circuit breaker 1 and the inverter network side circuit breaker 2 are in a normally closed state during normal operation. Do not connect in series between the stator of the wind turbine G, the rotor and the grid 12.
  • the Crowbar protection circuit is composed of a thyristor 7 and a shunt circuit, wherein the shunt circuit includes a rectifier bridge 6, a circuit breaker 5, and a release resistor 8.
  • the thyristor 7 can also be called a thyristor, and has a positive pole, a negative pole and a gate.
  • the positive pole and the negative pole of the thyristor 7 are connected in series with the rectifier bridge 6 and the release resistor 8, respectively, and the gate is connected with a control circuit (also called a control module) 9, the circuit breaker 5 is connected to the connection point between the rotor of the wind power generator G and the frequency converter group, and the circuit breaker 5 is in a normally closed state during normal operation.
  • the shunt circuit acts as a bypass shunt, which can bypass the inverter group.
  • the control circuit 9 includes a voltage monitoring unit 91, a stator control unit 92, a crowbar switch control unit 93 (also referred to as a rotor control unit), and a thyristor control unit 94.
  • the voltage monitoring unit 91 is connected to the power grid and the DC bus of the frequency converter for monitoring the voltage value of the power grid and the voltage value of the DC bus of the frequency converter group. When the power grid is not normal, the DC bus voltage of the frequency converter group can change rapidly.
  • the thyristor control unit 94 is connected to the voltage monitoring unit 91 and the gate of the thyristor 7, respectively.
  • the thyristor 7 is controlled to be closed by the thyristor control unit 94, so that the shunt circuit can perform shunt protection on the wind turbine inverter group.
  • the stator control unit 92 is connected to the thyristor control unit 94, the voltage monitoring unit 91, and the stator circuit breaker 1, respectively, and after the thyristor control unit 94 controls the thyristor 7 to be closed, the stator circuit breaker 1 is controlled to be turned off by the stator control unit 92.
  • the crowbar switch control unit 93 Since the crowbar switch control unit 93 is connected to the stator control unit 92 and the circuit breaker 5, respectively, when the stator circuit breaker 1 is turned off, the crowbar switch control unit 93 further controls the circuit breaker 5 to be disconnected and then closed. .
  • the thyristor control unit 94 controls the inter-cell tube 7 to be closed, which can be triggered by the gate voltage of the thyristor 7 being forwarded.
  • the circuit breaker 5 is in a closed state, so the positive electrode of the thyristor 7 has a forward voltage, and the thyristor 7 is closed when the gate of the thyristor 7 is turned on.
  • the thyristor 7 is closed, so that the shunt circuit is connected to the loop of the wind turbine G rotor, and the inverter The group performs bypass shunting to avoid damage to the inverter group caused by overcurrent and overvoltage, so that the wind turbine does not have to be off-grid when the grid voltage drops, realizing the low voltage ride through (LVRT) function.
  • LVRT low voltage ride through
  • the stator circuit breaker 1 When the thyristor control unit 94 controls the thyristor 7 to be closed, the stator circuit breaker 1 is immediately controlled to be disconnected by the stator control unit 92, and the stator circuit breaker 1 is disconnected so that the stator of the wind power generator G is disconnected from the power grid, thereby avoiding the absorption of the power grid. Power.
  • the crowbar switch control unit 93 controls the action after the circuit breaker 5 is first turned off and then closed, and the circuit breaker 5 is disconnected so that the thyristor ⁇ is automatically disconnected due to the instantaneous disappearance of the positive voltage of the positive pole, the circuit breaker 5
  • the protection function of the Crowbar protection circuit is restored.
  • the voltage recovery of the state in which the protection of the stator circuit breaker 1 is disconnected and the circuit breaker 5 is closed to the power grid is maintained.
  • the voltage monitoring unit 91 monitors that the voltage value of the power grid is restored, and the wind turbine control unit controls the wind power generator and the stator control unit 92.
  • the stator breaker 1 is closed to resume normal operation.
  • the low voltage ride through control system returns to the normal working state, and the above operation is repeated when the next grid voltage drop is detected.
  • the low voltage ride through control scheme of the present invention has the following advantages:
  • the thyristor can be triggered to close, and the inverter circuit is used to protect the inverter group to avoid damage of the inverter group due to overvoltage and overcurrent;
  • the stator circuit breaker can disconnect the stator from the grid while performing low voltage protection, thereby avoiding the absorption of reactive power from the grid, and the stator is off-grid in the event of grid failure, which can reduce the grid recovery due to sudden changes in the grid.
  • the wind turbine is reactive and active, and the connection between the stator and the grid is closed until the voltage of the grid is restored, so that the instantaneous impact of recovery can be avoided;
  • the inverter group always maintains the grid-connected state during the low-voltage traversal process, that is, it does not disconnect from the grid, so it can provide reactive power to the grid through the rotor to support the grid voltage recovery;
  • the low voltage ride-through control scheme of the present invention realizes the LVRT control of the doubly-fed induction wind turbine by the optimized circuit structure and control strategy of the single cylinder, and can improve the grid-connected time of the wind power generator, the power generation amount, and the grid voltage. Effectively reduce the damage of the inverter group when falling, and have a good LVRT The ability to provide strong support to the grid enhances the stability of the grid.
  • the low voltage ride-through control scheme in the present invention is particularly suitable for a MW (Double-Weight) variable-fed constant-frequency wind turbine generator set, for example, a 1.5 MW, 3 MW wind turbine, but is not limited thereto, and can be widely used. Suitable for all kinds of doubly-fed induction wind power generation equipment.

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

Description

低电压穿越控制方法 技术领域
本发明关于风力发电技术， 尤指一种低电压穿越控制方案。 背景技术
当今世界风力发电技术的迅猛发展， 装机容量快速上升， 风力发电在电 网供电中所占比例不断提高， 因此， 风力发电机组的并网质量以及运行状态 对电网的稳定性至关重要。 在运行过程中， 电网故障可能会导致电压跌落， 这会给风力发电设备带来一系列暂态过程， 例如出现过电压、 过电流或转速 上升等现象。 所以， 为保证风力发电设备的安全运行， 风力发电设备的控制 装置会在监测到电网电压跌落时将风力发电机解列， 即使风力发电机断开与 电网的连接。
但是， 在风力发电占电网供电比例较大的情况下， 由于电网电压跌落故 障引起的大量风力发电机解列会导致电力系统潮流的大幅变化甚至引起大面 积停电带来频率的稳定性问题。 因而出现了风力发电设备的低电压穿越（Low Voltage Ride Through, LVRT )技术， 即： 使风力发电设备在电网电压跌落时， 能在电压跌落设定偉和设定时间内保持并网， 支持电网电压恢复， 直到电网 恢复正常。 对于目前风力发电机的主流机型双馈感应发电机（Double Fed Induction Generator, DFIG ) 的运行特性和并脱网特性则显得尤为重要。 现有 的双馈感应发电机组大都采用晶闸管（SCR )撬棒， 当电网电压跌落时一定限 值时晶闸管触发保护变频器， 但是不具备低电压穿越功能。 而具有 LVRT功 能的双馈感应发电机大都采用低压旁路系统在转子侧采用 Crowbar主动撬棒 技术， 常用的有 IGBT型 Crowbar电路、 混合桥型 Crowbar电路、 带有旁路电 阻的 Crowbar电路。 但是这些控制技术存在着需要增加新的保护装置从而增 加的成本， 并且当电网故障时虽然励磁变流器和转子绕组得到了保护， 但此 时按感应电动机方式运行的机组将从系统中吸收大量的无功功率， 这将导致 电网电压稳定性的进一步恶化。 发明内容
本发明的主要目的在于提供一种用于双馈感应发电机的低电压穿越控制 方案， 利用该控制方案可以有效保证电网电压的稳定性。
本发明中的低电压穿越控制方案包括如下步骤：
1 )由控制电路监测连接在风力发电机转子与电网之间的变频器组的直流 母线电压和电网电压；
2 )判断监测到的变频器组的直流母线电压高于设计值， 由控制电路控制 连接在所述风力发电机转子上的 Crowbar保护电路中的晶闸管闭合进行分流 保护；
3 )在所述晶闸管闭合后， 由所述控制电路控制连接在所述风力发电机定 风
4 )在所述定子断路器断开所述电网与所述风力发电机定子之间的连接 后， 由所述控制电路进一步控制所述 Crowbar保护电路中的分流电路的断路 器先断开再闭合， 所述晶间管自动断开， 从而恢复所述分流电路的保护功能； 5 )保持上述状态， 直到所述控制电路监测到电网电压恢复， 快速使发电 机同步控制断路器闭合， 恢复正常工作。 器及网侧变频器，在第 1 )步骤中监测的直流母线电压为所述网侧变频器的直 为常闭状态的变频器网侧断路器。
在第 1 ) 步骤中所述控制电路中用于监测直流母线电压的是电压监测单 元。
在第 2 )步骤中用于分流保护的是 Crowbar保护电路中的分流电路， 该分 流电路包括分别与所述晶闸管正极与负极串联的整流桥与释放电阻， 及用于 接点的断路器。
第 3 )步骤中所述控制电路中用于控制所述定子断路器断开的是定子控制 单元。
第 4 )步骤中所述控制电路用于进一步控制所述断路器作先断开后闭合动 作的是撬棍开关控制单元。
本发明中的低电压穿越控制方案能够有效提高风力发电机的并网时间、 发电量、 有效减少变频器组的损坏、 减少电网恢复瞬间风机无功、 有功的抖 动、 从电网吸收无功以及对电网提供有力支撑， 增强电网的稳定性。 附图说明
图 1为本发明中低电压穿越控制方案的电路图；
图 2 为本发明中低电压穿越控制方案的电路图， 该图中示出控制电路的 框图。 具体实施方式
下面将结合附图对本发明中的具体实施例作进一步详细说明。
如图 1所示， 以 1.5MW的汉馈变速恒频感应风力发电机组为例， 用于变 速恒频感应风力发电机的低电压穿越控制方案由如下系统实现， 该系统包括 有定子断路器 1、 变频器网侧断路器 2、 组成变频器组的机侧变频器 3和网侧 变频器 4、 撬棍（Crowbar )保护电路及控制电路， 其中机侧变频器 3与网侧 变频器 4串联后与风力发电机 G的转子连接， 同时经变频器网侧断路器 2与 电网 12连接， 如图 2所示， 利用该变频器网侧断路器 2可以在必要时控制整 个变频器组脱网。在电网 12与风力发电机 G的定子之间由定子断路器 1连接。 定子断路器 1与变频器网侧断路器 2在正常工作过程中均处于常闭状态， 分 别串联在风力发电机 G的定子、 转子与电网 12之间。
Crowbar保护电路由晶闸管 7和分流电路组成，其中分流电路包括有整流 桥 6、 断路器 5和释放电阻 8。 晶闸管 7又可以称为可控硅， 具有正极、 负极 和门极， 晶闸管 7的正极和负极分别串联整流桥 6和释放电阻 8， 门极与控制 电路（也称控制模块） 9连接， 断路器 5连接至风力发电机 G的转子与变频 器组之间的连接点， 该断路器 5在正常工作过程中处于常闭状态。 分流电路 起到旁路分流的作用 , 从而可以对变频器组起到旁路分流的作用。
如图 2所示，控制电路 9包括有电压监测单元 91、定子控制单元 92、 撬 棍开关控制单元 93 (也称转子控制单元）和晶闸管控制单元 94。 其中， 电压 监测单元 91与电网和变频器直流母线相连， 用于监测电网的电压值及变频器 组直流母线的电压值， 当电网电不正常时， 变频器组的直流母线电压能快速 发生变化； 晶闸管控制单元 94与电压监测单元 91和晶闸管 7的门极分别相 连， 当电压监测单元 91监测到变频器组（即网侧变频器 4 ) 的直流母线电压 值超过限值 (设计值） ， 由晶闸管控制单元 94控制晶闸管 7闭合， 使分流电 路能够对风力发电机变频器组进行分流保护。 定子控制单元 92与晶闸管控制 单元 94、 电压监测单元 91、 定子断路器 1分别相连， 当晶闸管控制单元 94 控制晶闸管 7闭合之后， 由定子控制单元 92控制定子断路器 1断开。 由于撬 棍开关控制单元 93与定子控制单元 92和断路器 5分别相连接， 当定子断路 器 1断开后， 由撬棍开关控制单元 93进一步控制断路器 5先作断开再作闭合 的操作。
本发明中低电压穿越控制系统的具体工作流程如下：
当电压监测单元 91监测到变频器直流母线的电压高于保护限值， 由晶闸 管控制单元 94控制晶间管 7闭合， 具体可以通过晶闸管 7的门极通入正向电 压来触发， 由于此时断路器 5处于闭合状态， 所以晶闸管 7正极有正向电压， 当晶闸管 7门极通入正向电压时晶闸管 7即闭合。
晶闸管 7闭合， 使得分流电路连入风力发电机 G转子的回路， 对变频器 组进行旁路分流， 从而避免过电流和过电压对变频器组的损坏， 使风力发电 机在电网电压跌落时不必脱网， 实现了低电压穿越（LVRT )功能。
当晶闸管控制单元 94控制晶闸管 7闭合后， 由定子控制单元 92立即控 制定子断路器 1断开， 定子断路器 1断开使得风力发电机 G的定子与电网断 开连接， 从而避免了电网吸收无功功率。
当定子断路器 1断开之后， 撬棍开关控制单元 93控制断路器 5先断开再 闭后的动作， 断路器 5断开使得晶闸管 Ί由于正极的正电压瞬间消失而自动 断开， 断路器 5闭合后恢复 Crowbar保护电路的保护功能。 一直保持保护定 子断路器 1断开、 断路器 5闭合这种状态到电网的电压恢复， 由电压监测单 元 91监测到电网的电压值恢复后由变频器组控制风力发电机同定子控制单元 92控制定子断路器 1闭合恢复正常工作。
经过上述操作之后， 低电压穿越控制系统又恢复到正常的工作状态， 当 监测到下一次电网电压跌落时再重复上述操作。
综上所述， 本发明中的低电压穿越控制方案具有以下优点：
1、 当由于电网电压跌落导致变频器直流母线电压高于设定门限值以上 时， 可以触发晶闸管闭合， 利用分流电路来保护变频器组， 避免变频器组由 于过电压、 过电流而损坏；
2、 定子断路器能够在进行低电压保护的同时断开定子与电网的连接， 从 而避免从电网吸收无功功率， 并且定子在电网故障时脱网， 可以减少电网恢 复时由于电网的突变引发的风力发电机无功、 有功的抖动， 直至电网的电压 恢复之后才闭合定子与电网的连接， 可以避免恢复的瞬间沖击；
3、 变频器组在低电压穿越过程中始终保持并网状态， 即没有脱离与电网 的连接， 因此可以通过转子向电网提供无功功率， 支撑电网电压恢复；
4、 本发明中的低电压穿越控制方案以筒单优化的电路结构和控制策略实 现了对双馈感应风力发电机的 LVRT控制， 能够提高风力发电机的并网时间， 发电量， 在电网电压跌落时有效减少变频器组的损坏， 且具备良好的 LVRT 能力， 对电网提供有力支撑， 增强了电网的稳定性。
5、 本发明中的低电压穿越控制方案尤其适用于兆瓦 (MW)级的双馈变速 恒频风力发电机组， 例如： 1.5MW、 3MW的风力发电机组， 但并不限于此， 还可以广泛适用于各种双馈感应式风力发电设备。

Claims

权利要求
. 1、 一种低电压穿越控制方案， 包括有如下步骤：
1 )由控制电路监测连接在风力发电机转子与电网之间的变频器组的直流 母线电压和电网电压；
2 )判断监测到的变频器组的直流母线电压高于设计值， 由控制电路控制 连接在所述风力发电机转子上的 Crowbar保护电路中的晶闸管闭合进行分流 保护；
3 )在所述晶闸管闭合后， 由所述控制电路控制连接在所述风力发电机定 子与电网之间的定子断路器断开所述风力发电机定子与电网的连接；
4 )在所述定子断路器断开所述电网与所述风力发电机定子之间的连接 后， 由所述控制电路进一步控制所述 Crowbar保护电路中的分流电路的断路 器先断开再闭合， 所述晶闸管自动断开， 从而恢复所述分流电路的保护功能； 5 )保持上述状态， 直到所述控制电路监测到电网电压恢复， 快速使发电 机同步控制断路器闭合， 恢复正常工作。
2、 根据权利要求 1所述的低电压穿越控制方案， 其特征在于， 所述变频 器， 在第 1 ) 步骤中监测的直流母线电压为所述网侧变频器的直流母线电压， 变频器网侧断路器。
3、 根据权利要求 1所述的低电压穿越控制方案， 其特征在于， 在第 1 ) 步骤中所述控制电路中用于监测直流母线电压的是电压监测单元。
4、 根据权利要求 1所述的低电压穿越控制方案， 其特征在于， 在第 2 ) 步骤中用于分流保护的是 Crowbar保护电路中的分流电路， 该分流电路包括 分别与所述晶闸管正极与负极串联的整流桥与释放电阻， 及用于将整流桥与 释放电阻连接至所述风力发电机的转子与所述变频器组之间的连接点的断路 器。
5、 根据权利要求 1所述的低电压穿越控制方案， 其特征在于， 第 3 ) 步 骤中所述控制电路中用于控制所述定子断 器断开的是定子控制单元。
6、 根据权利要求 1所述的低电压穿越控制方案， 其特征在于， 第 4 ) 步 骤中所述控制电路用于进一步控制所述断路器作先断开后闭合动作的是撬棍 开关控制单元。
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