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含PQ控制逆变型分布式电源的配电网故障分析方法

DOI: 10.13334/j.0258-8013.pcsee.2014.04.006, PP. 555-561

Keywords: 逆变型分布式电源,PQ控制,故障穿越,等值模型,故障分析,配电网

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Abstract:

随着逆变型分布式电源(inverterinterfaceddistributedgeneration,IIDG)在配电网中的渗透率不断提高,且在新的故障穿越行为要求下,现有的故障分析方法已不再适用。为此,提出一种适应于最新并网规定的含PQ控制IIDG的配电网故障分析方法。该方法首先通过分析IIDG故障电流特性,提出计及控制特性的IIDG压控电流源等值模型;在此基础上,建立了故障下的含IIDG配电网节点电压方程,并针对不同IIDG间相互耦合以及公共连接点(pointofcommoncoupling,PCC)故障电压与IIDG故障电流之间存在非线性关系,提出相应的迭代修正求解方法。最后,通过算例仿真计算,验证了所提方法的可行性和有效性。

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