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高压电器  2015 

特高压换流站交流滤波器断路器恢复电压特性研究

DOI: DOI:10.13296/j.1001-1609.hva.2015.08.001, PP. 1-7

Keywords: 特高压换流站,恢复电压,断路器,交流滤波器,暂态仿真

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Abstract:

笔者使用PSCAD暂态仿真软件,首次针对某特高压直流输电工程中直流电压等级为±800kV、交流电压等级为750kV的特高压直流换流站进行了完整建模仿真,对交流滤波器断路器上的恢复电压进行了仿真研究。通过不同工况、不同故障时刻、不同开断时刻条件下的对比,得到了各种情况下最严重的恢复电压特性,并与现有断路器标准进行了比较。仿真结果表明,在交流侧发生三相短路接地(3LG)故障或其他多相短路故障后,断路器断口间电压已经超出国家标准中对开断容性电流能力的规定,最严重的暂态恢复电压也已经超出断路器行业标准中四参数法的规定。此外,在某些情况下开断初期还会产生较大的初始瞬态恢复电压上升率,因此应当采取一定手段加以抑制。

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