电动汽车充电谐波电流对配电网损耗影响的研究  

Research on the Influence of Electric Vehicle Charging Harmonic Current upon Distribution Network Loss

作　　者：刘献良 Liu Xianliang(Suzhou Nanyang Cable Co.,Ltd.,Zhangjiagang Jiangsu 215638,China)

机构地区：[1]苏州南洋电缆有限公司,江苏张家港215638

出　　处：《电气自动化》2021年第4期31-33,共3页Electrical Automation

摘　　要：电动汽车在充电时会在配电网中引入谐波电流,而谐波电流损耗将导致供电质量的下降。为了研究电动汽车充电谐波电流对配电网损耗的影响,利用相关的理论模型从输电线路与配电变压器二个维度分析了电动汽车充电谐波电流对谐波损耗、谐波畸变比以及损耗比的影响,研究了电动汽车充电谐波电流、充电桩台数与配电变压器损耗之间的关联规律。结果表明:谐波损耗随着谐波含量的增加而增加,在渗透率不变的情况下,充电负荷越多,损耗越小;谐波含量随着充电桩接入台数的增加而下降,当充电桩台数不变时,低频奇次谐波电流占有更多比例,其中以5次谐波较为显著,对变压器损耗贡献较大。Harmonic current will be introduced into the distribution network during charging of electric vehicles,and its loss will result in the deterioration of power supply quality.In order to explore the influence of charging harmonic current on distribution network loss,the influence of harmonic current upon harmonic loss,harmonic distortion ratio and loss ratio,and the law of relevancy between harmonic current,number of charging piles and distribution transformer loss were studied from two dimensions,i.e.transmission line and distribution transformer,by use of a related theoretical model.The results showed that harmonic loss would rise with the increase of harmonic content,and the higher the charging load was,the smaller the loss would be,if the penetration rate remained unchanged;the harmonic content decreased with the increase of the number of charging piles.When the number of charging piles remained unchanged,low-frequency odd harmonics occupied higher proportion,whereby the majority was the fifth harmonic which contributed more to transformer loss.

关 键 词：电动汽车 充电谐波电流 配电网损耗 输电线路 变压器 

分 类 号：TM93[电气工程—电力电子与电力传动]