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大规模电动汽车智能充电站对电力系统小干扰稳定性的影响

DOI: 10.13334/j.0258-8013.pcsee.2014.16.006, PP. 2561-2573

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Abstract:

大规模智能充电站可以很好地满足和调节电动汽车的充电需求,但同时也不可避免地给电网的稳定性运行带来新的影响和挑战。基于阻尼转矩分析法(dampingtorqueanalysis,DTA),着重探讨智能充电站的接入对于输电网动态稳定性的影响。为了简化分析,单机无穷大系统将用于模拟配电网与外部输电网。配电网中的智能充电站群被视为一个接入输电网的等值智能充电站。分析得出,在大规模智能充电站的设计中,充电容量对于小干扰稳定性中的阻尼比有很大的影响。在其最佳充电容量下充电,将会最有利于保持系统的动态稳定,系统阻尼比也保持最大。根据所建立的Phillips-Heffron模型可知,在智能充电站的有功和无功控制通道上设计并加装稳定器,能够有效地提高系统阻尼,更快地抑制联络线上的功率振荡。算例分析验证了所得结论。

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