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电网技术  2011 

±800kV特高压直流换相失败的RTDS仿真及后续控制保护特性研究

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Keywords: 特高压直流输电,换相失败,RTDS仿真,控制保护系统,动态特性

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Abstract:

为在大系统下反映特高压直流输电换相失败的动态性能,以及动态特性的后续控制保护策略。本文在分析特高压直流输电系统交流侧故障触和发脉冲故障引起换相失败机理、后续控制保护特性的基础上,在南方电网主网等值系统下采用基于RTDS的直流控制保护数模仿真平台上对特高压直流输电常见的包括阀短路、交流单相短路、丢失触发脉冲三类问题引发的换相失败进行仿真,分析不同因素诱发下换相失败及其后续故障阀组和非故障阀组的控制特性及保护配合,并比较三类换相失败动态性能的主要差异。仿真和分析表明,特高压直流输电换相失败在不同的故障诱因下有不同的控制保护特性及其显现的规律性。仿真和分析对在大系统下全面地认识特高压直流系统换相失败动态特性及其控制保护策略有重要作用。

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