电容器同期合闸与变压器的铁磁谐振分析

Analysis of Homochronous Closing Circuit of Capacitor and Ferromagnetic Resonance of Transformer

并联电容器组进行无功补偿时,由于断路器开关投切方式不当,可能造成并联电容器组与变压器铁芯线圈发生铁磁谐振。文章通过断路器同期合闸时的系统发生过电压现象,对谐振时并联电容器组与变压器铁芯线圈伏安特性进行分析,给出并联电容器与变压器产生铁磁谐振的机理和特点,并提出了有效抑制铁磁谐振发生的具体措施。仿真结果验证了理论分析与抑制方法的正确性。

When the shunt capacitor banks carry out the reactive power compensation,the ferromagnetic resonance be-tween shunt capacitor banks and transformer core coil may come about due to the improper way of opening up and closing circuit breaker switch. Through the phenomenon of the system overvoltage when the circuit breaker switch clo-ses homochronously ,the volt-ampere characteristic of shunt capacitor bank and transformer core coil will be analyzed in this paper. The mechanism and characteristics of ferromagnetic resonance will be given out when the ferromagnetic resonance occurred,and the specific measures will be presented that it can effectively suppressed the occurrence of ferromagnetic resonance. Simulation results verify the theoretical analysis and correctness of the suppression method.