谐波情况下并联电容器组的投切方法研究

Study on the Switching Method of Shunt Capacitor Bank in Harmonic Conditions

针对变电站装设有不同电抗率并联补偿装置与变电站电压无功控制(VQC)相结合,进行了谐波情况下电容器组投切方法的研究。电容器投切组数由VQC确定,但投切哪些支路则根据谐波情况进一步确定。本文依据谐波的严重程度,将变电站的谐波情况分为四种,结合电容器组投入后谐波电流的补偿分析,探讨了不同谐波情况下电容器组适宜的配置方法。本文给出了变电站电压、无功控制中各种谐波情况下电容器组的投切策略,即在不同的谐波情况下,对不同电抗率的电容器组进行最优的组合,在满足电压无功控制的前提下以达到对谐波最大限度的补偿效果。最后,通过仿真分析验证了所给出方法的正确性。

As for the shunt compensation device with different reactance rate in combination with volt- age and reactive power control （VQC） of substation, the switching method of capacitor bank under harmonic condition is studied. The number of capacitor switched is determined by the VQC, but the branch to be switched is determined further by the harmonic condition. In this paper, the substation harmonics, according to the severity of harmonics, are divided into four cases and the appropriate con- figuration methods of capacitor bank at different harmonic cases are studied based on the compensation analysis of harmonic current of capacitor bank after switching. The switching strategy of capacitor bank of various harmonic cases in the voltage and reactive power control of substation, namely, at different harmonic conditions, the capacitor bank at different reactance rate is optimally combined and, under condition of meeting voltage reactive power control ,reach the maximum compensation result to the har- monics. Finally, creativeness of the given method is verified through the simulation analysis.