变电站并联电容器谐波放大及改进措施

提出了谐波等值网络化简法,分析各奇次谐波下随电容器组投入情况不同,变电站等值网络的变化过程,研究了电容器支路发生谐波谐振放大的各种可能性.并在此基础上,指出电容器组须按照分析结果进行投运,以避开谐振点,从而避免谐波电流放大的发生.对驻马店变电站实际运行电容器组进行的仿真分析,证明了所提出分析方法的正确性和有效性.该方法对实际生产运行具有指导意义,可避免传统方法所造成的设备浪费,对多数带并联补偿的三绕组电力变压器都适用,并可作为校验方法供设计时使用.

Harmonic amplification of parallel capacitors in transformer substations and its improment

Harmonic equivalence network simplification method is proposed to analyze the changing process of transformer substation equivalence network along with different operation modes of capacitors under all the odd harmonics and to find out potential harmonic resonance amplifications from capacitor circuits.Then,it is pointed out that the capacitors should be put into operation according to the analysis result so as to keep away from resonance points and avoid harmonic current amplification.Simulation analysis on the operating capacitors in Zhumadian transformer substation shows the validity and efficiency of the method presented in this paper.The harmonic equivalence network simplification method is meaningful for the practical production.It can avoid the waste of equipments caused by traditional methods.This method is applicable for most triple-wound transformers equipped with parallel compensations and can be used as method of calibration while designing.