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计及转子励磁控制的双馈感应发电机短路电流研究

DOI: 10.13334/j.0258-8013.pcsee.2014.34.009, PP. 6083-6092

Keywords: 风力发电,双馈感应发电机,短路电流,电压跌落,矢量控制

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Abstract:

双馈风电机组的规模化应用使电力系统的故障暂态特性发生变化。为了保障电力系统规划设计和保护控制的顺利实施,必须充分掌握双馈感应发电机(doublyfedinductiongenerator,DFIG)输出短路电流的特征。目前双馈感应发电机的暂态分析尚未计及变流器励磁控制的影响,使双馈风电机组短路电流还难以准确分析和计算。针对DFIG转子侧变流器励磁控制与发电机电磁过程的复杂暂态耦合,通过构建包含变流器调控过程及发电机电磁暂态的转子回路动态模型,重点分析了电网对称短路冲击作用下DFIG的暂态扰动及其传递特性,推导了计及励磁调节作用的DFIG定转子短路电流简化表达式,分析了励磁控制下DFIG短路电流的特征以及控制方式对暂态行为的影响,利用时域仿真验证了理论分析的正确性。

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