LC输出滤波器的改进及在STATCOM应用中优化设计

针对LC输出滤波器在滤除逆变器开关器件通断时引起的高频毛刺时的不足,提出对LC输出滤波器的改进方法,即在LC输出滤波器的电容上串联一个小电阻,使改进后的LC输出滤波器能有效地抑制静止无功发生器(STATCOM)装置与电网发生的谐振。从无功补偿器能力和瞬态电流跟踪能力两方面讨论了改进的LC输出滤波器对STATCOM装置的影响。运用改进的遗传算法对改进LC输出滤波器的参数进行优化设计,使其在滤除高频谐波的同时,兼顾无功补偿器能力。采用Matlab软件进行模拟仿真的结果表明,所提出的设计方法能满足系统无功补偿的要求。

Improvement of LC output filter and its optimization in STATCOM

When used in voltage source inverter,LC output filter could not filter the high frequency burrs caused by the on-off switching of inverter,an improvement is proposed to connect a small resistor in serial to its capacitor.The improved LC output filter can effectively suppress the resonance between STATCOM and power network.Influences of improved LC output filter on STATCOM are discussed from both reactive power compensation ability and transient current tracking ability.Parameters of the output filter are optimized by improved genetic algorithm for effectively eliminating high frequency harmonics and compensating reactive power at the same time.Simulations with Matlab show that the proposed method meets the requirement for reactive power compensation.