电力系统工频过电压的计算与仿真

Calculation and Simulation of Power Frequency Overvoltage in Power System

日常的绝大多数的负载为感性负载,增加电抗器,可以使线路更加稳定的运行。该文在没有电抗器和有电抗器的情况下,对空载线路分别求解首末端电压关系,发现在有电抗器的情况下,末端电压波动要小,首末端电压比较小。最后使用EMTP进行仿真,搭建了没有电抗器和有电抗器的空载线路,采集了输入输出点电压的波形,然后画出首末端电压图,发现首末端电压波形都是标准的正弦,而且是同相位,只有幅值大小不等,仿真结果和理论相一致。

Most of the daily loads are inductive loads.Add reactor,can make line more stable operation.In this paper,the head and end voltage relationship of no-load line is solved respectively without reactor and with reactor.It is found that in the case of reactor,the end voltage fluctuation is small and the head and end voltage is relatively small.Finally,EMTP is used for simulation,no-load lines without reactor and with reactor are built,the voltage waveforms of input and output points are collected,and then the head and end voltage diagram is drawn.It is found that the head and end voltage waveforms are standard sinusoidal and in the same phase,only the amplitude is different,and the simulation results are consistent with the theory.