同塔双回直流输电线路保护算法仿真验证
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摘要
针对同塔双回直流输电线路的保护,采用PSCAD建立±500kV同塔双回直流系统仿真模型,分析了其行波传播过程、边界频率特性以及同塔双回直流输电线路的解耦,并对其现行保护算法进行仿真验证。仿真分析表明,直流线路采用现行的行波保护判据及定值,在区内线路远端高阻故障下,行波保护拒动;而后备保护差动保护在区外故障下,有误动风险。
Protection for double HVDC circuit on the same tower, built by PSCAD 500 kV double circuit DC system simulation model, analyzed the wave propagation process, decoupling boundary and frequency characteristics of double DC circuit on the same tower, and the verification of current protection algorithm. The simulation analysis shows that the DC line adopts the current traveling wave protection criterion and the fixed value, and the traveling wave protection fails to move under the fault of the remote high impedance in the area, while the backup protection differential protection has the risk of mal-operation under the out of zone fault.
Protection for double HVDC circuit on the same tower, built by PSCAD 500 kV double circuit DC system simulation model, analyzed the wave propagation process, decoupling boundary and frequency characteristics of double DC circuit on the same tower, and the verification of current protection algorithm. The simulation analysis shows that the DC line adopts the current traveling wave protection criterion and the fixed value, and the traveling wave protection fails to move under the fault of the remote high impedance in the area, while the backup protection differential protection has the risk of mal-operation under the out of zone fault.
引文
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[2]束洪春,刘可真,朱盛强,等.±800kV特高压直流输电线路单端电气量暂态保护[J].中国电机工程学报,2010,30(31):108-117.
[3]李玉玺.直流控制保护系统配置探析[J].云南电力技术,2014,42(3):64-66
[4]王旭.直流输电线路保护的研究[J].云南电力技术,2015,43(4):86-88
[5]束洪春,田鑫萃,董俊,等.±800kV基于多重分形谱的高压直流输电线路区内外故障识别方法[J].电工技术学报,2013,28(1):251-258.
[6]周尚礼,周全,邬乾晋.同塔双回高压直流输电线路故障行波特性研究[J].电力系统保护与控制,2014,(23):69-75
[7]胡嘉滨.同塔双回直流线路故障暂态特性分析及故障选线方法研究[D].华南理工大学,2015
[8]王海军,周全,梁远升.基于电压突变量的同塔双回直流输电线路故障选线方法[J].电力系统保护与控制,2015,(7):23-29
[9]刘辛晔.高压直流输电保护定值整定方法研究[D].华北电力大学,2016.