规避谐振点的并联电容器电抗率选取仿真  

Simulation of Reactance Rate of Shunt Capacitor Avoiding Resonance Point

作　　者：黄灿英[1] 朱淑云[1] 陈艳[1] 谭菊华[1] HUANG Can-ying;ZHU Shu-yun;CHEN Yan;TAN Ju-hua(Nanchang University College of Science and Technology,Nanchang Jiangxi 330029,China)

机构地区：[1]南昌大学科学技术学院,江西南昌330029

出　　处：《计算机仿真》2020年第10期83-86,123,共5页Computer Simulation

基　　金：江西省教育厅科学技术研究项目(171450)。

摘　　要：合理的电抗率选取是保证并联电容器安全运行的一个重要因素,结合国内电网中因谐振导致电容器损坏的事故,提出并联电容器电抗率选取方法。通过对并联电容器进行分析,根据并联电容器支路和电网系统支路的谐波电流,获取并联谐振点和串联谐振点,分析串联电抗率对电网谐波的影响,得到谐波并联谐振条件和串联谐振条件,完成电抗率选取。实验结果表明,当串联电抗器的电抗值与电容器组的容抗值之比处于4.5%~6%的范围之内时,则表示并联电容器可吸收5次及5次以上的谐波,能够有效的预防发生谐振;而当串联电抗器的电抗值与电容器组的容抗值之比为7%时,可吸收4次及4次以上的谐波,能够有效的预防发生谐振;当串联电抗器的电抗值与电容器组的容抗值之比高达14%时,可吸收3次及3次以上的谐波,能够有效的预防发生谐振。Reasonable selection for reactance rate is an important factor to ensure the safe operation of shunt capacitor. Considering the capacitor damage caused by resonance in power grid, we put forward a method for selecting the reactance ratio of shunt capacitor. By analyzing the shunt capacitor, we used the harmonic current of shunt capacitor branch and power system branch to get the shunt resonance points and series resonance points. Moreover, we analyzed the influence of series reactance rate on power grid harmonic wave, so that the harmonic parallel resonance condition and series resonance condition could be obtained. Finally, we completed the selection of reactance rate. Simulation results show that, when the ratio between the reactance value of series reactor and the capacitive reactance value of capacitor set is in the range of 4.5%~6%, the parallel capacitor can absorb harmonic wave more than five times, so that we can effectively prevent resonance. When the ratio between the reactance value of series reactor and the capacitive reactance value of capacitor set is 7%, the parallel capacitor can absorb the harmonic wave more than four times, so that we can effectively prevent resonance. When the ratio between the reactance value of series reactor and the capacitive reactance value of capacitor set reaches 14%, the parallel capacitor can absorb harmonic wave more than three times, so that we can effectively prevent resonance.

关 键 词：规避谐振点 并联电容器 电抗率选取 串联电抗器 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]