特高压直流换流站中分层接入方式下特高压交流母线过电压

发布时间：2018-05-22 20:37

本文选题：特高压直流 + 特高压交流　；参考：《高电压技术》2016年12期

【摘要】：针对±800 k V特高压直流系统首次采用逆变侧分层接入到1 000 k V特高压交流系统的需求,为了确定换流站中1 000 k V交流母线的过电压水平,分别在两种分层接入方案的多种严重工况下,对1 000 k V交流母线的工频暂时过电压和操作过电压水平进行了仿真计算。分析了最高过电压产生的原因,给出了最高过电压产生的工况以及过电压水平。方案1中泰州站相对地过电压标幺值最高为1.54,相间过电压标幺值最高为2.71;方案2中临沂站相对地过电压标幺值最高为1.57,相间过电压标幺值最高为2.97。提出了采用额定电压低的避雷器降低换流母线操作过电压的措施,为特高压换流站1 000 k V交流侧空气间隙距离的选取和绝缘配合提供依据。
[Abstract]:In order to determine the overvoltage level of the 1 000 kV AC bus in the converter station, for the first time 卤800 kV UHV DC system needs to be connected to the 1 000 kV UHV AC system by using the inverter side stratified for the first time. In this paper, the power frequency transient overvoltage and operating overvoltage level of 1 000 kV AC bus are simulated under several serious conditions of two layered access schemes. The causes of the maximum overvoltage are analyzed, and the working conditions and the level of the overvoltage are given. In scheme 1, the highest value of relative overvoltage is 1.54 for Taizhou station, and 2.71 for interphase overvoltage standard, and 1.57 for Linyi station and 2.97 for interphase overvoltage standard. The measures of reducing the operating overvoltage of commutating busbar by using the arrester with low rated voltage are put forward, which can provide the basis for the selection of air gap distance of 1 000 kV AC side of UHV converter station and the coordination of insulation.
【作者单位】：华北电力大学电气与电子工程学院;中国电力科学研究院;北京航天时代光电科技有限公司;
【分类号】：TM721.1

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