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采用现有有源滤波器对大功率非线性负载进行谐波滤除时 ,要求逆变器同时具有很大的容量和较高的开关频率 ,这必然增加逆变器的技术难度和成本 ,限制了有源滤波器在大功率场合的应用 .作者针对这一问题提出一种新型并联混合型有源滤波器 ,根据非线性负载产生的主要谐波分量设计逆变器以减小逆变器电流容量 ,同时逆变器输出电压频率较低 ,逆变器开关频率可相应降低 .逆变器与无源滤波器电感并联 ,当逆变器发生故障时 ,无源滤波器仍能正常工作 .由于并联滤波电感的分流作用 ,逆变器电流减小 .此外 ,还提出一种以ip iq 法为基础的单次谐波电流检测方法 .Matlab仿真结果表明 ,并联混合型有源滤波器滤波效果与现有并联混合型有源滤波器的滤波效果接近 ,但其中逆变器电流减少 5 0 % .
When the existing active filter is used for harmonic elimination of high-power nonlinear loads, the inverter needs to have a large capacity and a high switching frequency at the same time, which inevitably increases the technical difficulty and cost of the inverter and limits The application of active filter in high power applications.Aiming at this problem, the authors proposed a new type of parallel hybrid active power filter, designed inverter based on the main harmonic components generated by nonlinear load to reduce the inverter current Capacity, at the same time inverter output voltage frequency is low, the inverter switching frequency can be reduced accordingly. Inverter and passive filter inductance in parallel, when the inverter fails, the passive filter can still work normally. Parallel shunt inductance shunt, inverter current decreases.In addition, a method based on ip iq single harmonic current detection method is also proposed.Matlab simulation results show that the shunt hybrid active filter filter effect and The filtering effect of the existing parallel hybrid active filter is close, but the inverter current is reduced by 50%.