1 000 kV晋南荆线工频暂态过电压研究

研究了该输电线路在空载长线电容效应、甩负荷及不对称故障三种工况下将高抗分别装设在线路首端或末端以及同时在首末两端时对工频电压升高的影响,讨论了并联电抗器补偿度不同时对工频过电压的限制效果,并运用电磁暂态仿真软件PSCAD/EMTDC进行了仿真计算.仿真结果表明,工频电压升高的最大值大多数出现在线路中部,高抗安装在线路末端时抑制工频电压升高的效果比安装在首端或两端时要好,而且并联电抗器的补偿度越高限压效果越明显.

Research on Power Frequency Transient Over-voltage in 1 000 kV UHV Transmission Line from Jincheng to Jingzhou via Nanyang

1000kV single circuit UHV power transmission demonstration project from Jincheng to Jingzhou via Nanyang is the first UHV transmission line in China. Researching its level of power frequency over-voltage has important directive significance to the formation of large regional power grid. The influence on power frequency voltage rising by installing the high voltage parallel reactors separately at the receiving end of transmission line and at the sending end or at both ends was investigated in three operating conditions, i. e., capacity effect of unloaded line, load shedding and single-phrase-to-ground faults. The effect of restriking overvoltage using parallel reactors with differernt compensation degree was discussed. Simulation calculation was conducted to the above research with electromagnetism transient software PSCAD/EMTDC. The simulation results show that: the effect of eliminating power frequency voltage rising is better when high voltage parallel reactors are installed at the receiving end of transmission line but not at the sending end or at both ends. The higher the compensation degree of parallel reactors is, the more obvious the limiting voltage effect becomes.