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在d-q-0坐标系下建立了三相四线直流电容中分结构的单调谐式混合有源电力滤波器(HAPF)的数学模型。通过此数学模型,对含中线电感与不含中线电感的单调谐式HAPF无源部分的滤波特性进行了分析和讨论。根据HAPF有源部分的容量分析并结合其无源部分的滤波特性,优化了一般负载谐波电流情况下的三相四线单调谐式HAPF的结构,并给出了其直流侧最小电压等级的表达式,通过减小HAPF有源部分容量达到了降低HAPF成本的目的。最后,通过仿真验证了最小电压等级理论的正确性及此优化结构的有效性。
A mathematical model of a monotonic hybrid active power filter (HAPF) with a three-phase four-wire DC capacitor mid-point structure is established in the d-q-0 coordinate system. Through this mathematical model, the filtering characteristics of the monotonic HAPF passive part with or without neutral inductance are analyzed and discussed. According to the capacity analysis of active part of HAPF and the filtering characteristics of its passive part, the structure of three-phase four-wire single-tuned HAPF under normal load harmonic current is optimized, and the minimum voltage level The expression reduces the HAPF cost by reducing the active portion capacity of the HAPF. Finally, the correctness of the theory of minimum voltage level and the validity of the optimized structure are verified through simulation.