适应多类型故障的双馈风电机组低电压穿越综合控制策略  

A Comprehensive Low Voltage Ride Through Control Strategy of Wind Turbine Driven Doubly-fed Induction Generator Adapted to Multi-type Faults

作　　者：蔚芳 刘其辉 谢孟丽 张建华 

机构地区：[1]新能源电力系统国家重点实验室,华北电力大学,北京市102206

出　　处：《电力系统自动化》2013年第5期23-28,133,共7页Automation of Electric Power Systems

基　　金：国家高技术研究发展计划(863计划)资助项目(2008AA05Z216,2007AA05Z249);国家自然科学基金资助项目(50807012)~~

摘　　要：随着风电机组装机容量的快速增长,电网对风电场的并网要求不断提高。为了实现不同电网故障(对称、不对称)下的低电压穿越(LVRT)及对电网的无功支撑,文中在全面分析目前国内外风电LVRT技术研究现状及不足的基础上,针对双馈风电机组提出了一种集成软、硬件方案的LVRT综合控制策略。该策略中具有优化投切判据的撬棒(Crowbar)保护电路可根据电网故障类型自动判断投入、切出时间,具有更强的灵活性及适用性;增加无功输出补偿目标的网侧变流器不对称控制的软件方案,使双馈风电机组在故障期间具有无功支撑能力。通过电压跌落发生器模拟电网三相短路和两相接地短路,在一台30kW的双馈风电机组试验平台上进行了实验研究,验证了所提出策略的正确性与有效性。With the increasing installed capacity of the wind power, the grid will have more and more requirements on the wind farms. In order to achieve low voltage ride through （LVRT） under balanced or unbalanced system conditions, and also provide active and reactive power support to the system, this paper presents a comprehensive LVRT control strategy with combination of hardware and software. The Crowbar can be switched in and switched out depending on the type of fault. Therefore it is more flexible and adaptable. The addition of grid side inverter unbalance control aiming at reactive power control makes it possible for wind turbine driven doubly-fed induction generator （DFIG） to provide reactive power support to the main system. Experiment results of three-phase short circuit and two-phase short circuit fault with a 30 kW wind turbine driven DFIG validate the proposed control method.

关 键 词：双馈风电机组 低电压穿越 变流器 转子快速短接保护 综合控制策略 

分 类 号：TM315[电气工程—电机] TM76