姚良忠;杨晓峰;林智钦;薛尧;黄先进;郑琼林;王志冰;李琰;

• 1:中国电力科学研究院
• 2:北京交通大学电气工程学院

摘要(Abstract)：

下一代高压直流电网技术成为未来电网发展的重要方向,高压直流变压器是实现不同电压等级的直流电网线路之间互联的关键设备,也是制约直流电网推广的技术瓶颈之一。然而有关模块化多电平换流器型高压直流变压器(modular multilevel converter based HVDC transformer,M-HVDCT)拓扑的故障响应特性和故障穿越能力的研究尚未见诸报道。在搭建PSCAD/EMTDC仿真模型的基础上,首先分析了M-HVDCT的直流侧线路双极短路、单极接地短路故障机理,分析了系统的故障输出特性。结果表明,双极短路时的子模块电容放电是造成瞬态电流冲击的主因,而变压器耦合的阀侧馈能则是稳态故障电流的原因;M-HVDCT对双极短路故障具有故障隔离能力,而单极接地短路故障则会因为变压器的耦合作用而传到非故障侧,从而给系统带来负面影响。仿真实验结果验证了理论分析的正确性,研究结果将为直流电网技术的工程化研究提供重要的理论和工程应用基础。

关键词(KeyWords)： 高压直流电网;模块化多电平换流器;高压直流变压器;故障特性;双极故障;单极接地故障

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51261130484);; 国家电网公司科技项目支持(国家电网科研[2013]304号,NY71-13-041);; 中央高校基本科研业务费人才基金项目(2014RC013)~~

作者(Author): 姚良忠;杨晓峰;林智钦;薛尧;黄先进;郑琼林;王志冰;李琰;

Email:

DOI: 10.13335/j.1000-3673.pst.2016.04.011

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