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感应发电机接入配电网的短路计算序分量模型及算法

DOI: 10.13334/j.0258-8013.pcsee.2014.07.016, PP. 1140-1149

Keywords: 短路电流,序分量模型,鼠笼式感应发电机,转差

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Abstract:

分布式发电大规模接入电网将改变潮流和短路电流的分布。利用感应发电机(inductiongenerator,IG)正负序静态等值电路,研究电网不对称故障时定转子磁链序分量相关系数,并结合故障过程中IG暂态磁链特性和转差,建立IG短路计算的序分量电流源模型。比较计及转差前后和不同接入容量时多感应发电机(inductiongenerators,IGs)端电压和短路电流响应,揭示出IGs短路电流与电网节点电压的耦合关系。推导电网故障瞬间IG暂态等值电势,提出计及转差变化的多IGs配电网短路电流的对称分量迭代算法。采用PSCAD/EMTDC仿真软件中IG的5阶动态模型,仿真验证了所提方法的正确性。

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