从分析电气化铁道对电网电能质量影响的需求出发,采用割集原理为局部电网建立了适合进行电能质量评估的模型,并利用模拟短路的方法得到了外部电网的广义多端口诺顿等值电路参数。在此基础上考虑多个干扰源共同作用下,评估了胶济电气化铁道负序与谐波对山东电网电能质量的影响。 Starting from the demand of analyzing the influence of electrified railway on the power quality of power grids, the cut-set principle is adopted to establish a model suitable for power quality assessment for local power grids. The parameters of Norton equivalent circuit of generalized multi-port for external power grids are obtained by the method of analog short circuit. On this basis, under the joint action of multiple interferers, the influence of negative sequence and harmonics of Jiaoji Electrified Railway on the power quality of Shandong Power Grid was evaluated.