摘要
高压直流输电系统可用大地构成输电回路,接地极系统运行方式复杂。建立了±500 kV直流输电系统仿真模型,分析了接地极线路故障时的运行特性,并针对接地极线路单线短路故障,提出了一种基于贝杰龙模型的接地极线路故障测距新方法。利用故障后首端电压和两出线电流推算沿线电压分布,根据故障点或极址点为全线电压最小值的特点构造故障测距函数,计算出故障距离。PSCAD/EMTDC仿真计算结果和工程实例表明,该算法可在接地极全线范围内实现故障定位,且具有较高精度。
With earth taken as part of the HVDC system loop,the grounding electrode system is connected to ground effectively,the operation mode of the system is different from normal HVDC lines. A ±500 kV HVDC system model is established in this paper by using PSCAD/EMTDC simulation platform,based on which the fault operation characteristic of grounding electrode line is simulated and analyzed,and a fault location method based on the Bergeron line model aimed at single line grounded short circuit is also put forward in this paper. The head-end voltage and current of two outlets after fault are used to calculate the voltage distribution along line.According to the characteristics that the fault or electrode point is the minimum voltage along line,the fault location function is established to calculate the fault distance. The simulation result and project instances indicate that the fault of the grounding electrode line can be located accurately with the proposed method.
出处
《电网与清洁能源》
北大核心
2016年第3期105-110,114,共7页
Power System and Clean Energy
