水电站220 kV输电线路故障行波定位

Fault Wave Location of 220 kV Transmission Line in Hydropower Station

针对水电站输电线路发生故障后无法准确实施定位的问题,从行波的实际传播理论出发,推导出一种与波速无关的改进双端定位算法。利用变分模态分解(VMD)能自适应地分解故障电流行波信号,Teager能量算子(TEO)可快速追踪信号的能量变化、运算量小的独特优势,建立了基于VMD-TEO的220 kV输电线路行波定位模型,该模型无需考虑波速修正和双端时间同步。PSCAD仿真结果表明,改进的双端故障定位模型误差百分比最大为0.239%,优于其他定位算法,验证了所提方法的可靠性和优越性。

Aiming at the inability to accurately locate the fault of the transmission line in hydropower station, an improved double-end location algorithm independent of wave velocity was derived from the actual propagation theory of traveling waves. Using the unique advantages of variational mode decomposition(VMD) which can adaptively decompose fault current traveling wave signals, and the Teager energy operator(TEO) which can quickly track the energy change of signals and has less computation, a traveling wave positioning model for 220 kV transmission lines based on VMD-TEO was established. The model does not need to consider wave velocity correction and double terminal time synchronization. The simulation results of PSCAD show that the maximum error percentage of the improved double-end fault location model is 0.239%, which is superior to other location algorithms. The reliability and superiority of the proposed method were verified.