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电网技术  2014 

基于模块化多电平高压直流输电系统接地故障特性仿真分析

DOI: 10.13335/j.1000-3673.pst.2014.10.007, PP. 2658-2664

Keywords: 模块化多电平换流器,高压直流输电,接地故障,故障特性

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Abstract:

模块化多电平电压源换流器型高压直流输电采用子模块级联结构,解决了开关器件直接串联所带来的动态均压问题,同时具有输出电压波形品质高、开关频率和损耗低等诸多优点,因此成为极具市场应用价值的输电技术之一。在故障时,工作机理、调制策略和拓扑结构的差异导致系统呈现出与传统直流和电压源换流器型直流输电不同故障特性。分别以交流系统侧、阀侧和直流侧接地故障为例,在PSCAD/EMTDC中搭建仿真模型基础上,针对联接变压器绕组不同接线方式,分析其不同故障特性以及对系统运行的影响,并提出了应对策略。

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