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电网技术  2015 

基于谐波解析的电动汽车充电对配电变压器影响概率评估方法

DOI: 10.13335/j.1000-3673.pst.2015.08.033, PP. 2283-2290

Keywords: 配电变压器,充电负荷,谐波电流,寿命损失

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Abstract:

为更加完善地评估电动汽车充电负荷对配电变压器的影响,在分析不同类型电动汽车的充电方式、运行特点的基础上,利用三相整流充电机的谐波耦合导纳矩阵,对电动汽车充电电流谐波进行解析,推导了单台和多台充电机接入电网的电流谐波算法;通过谐波损耗因子量化谐波电流对变压器寿命损失的影响,与多种类型电动汽车充电负荷概率模拟相结合,提出计及电动汽车充电电流谐波的配变顶层油温、热点温度、相对老化率和寿命损失的概率评估方法。根据某电动公交车充电站的配变、本地负荷和充电机数据,分析了不同电动汽车渗透率、充电方式组合下的配变运行特征参数变化规律。结果表明,不合理的不同充电方式的电动汽车比例安排,会对配电变压器的寿命损失造成严重的影响。

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