串入式串联混合有源电力滤波器的研制

Development of the Series-in Series Hybrid Active Power Filter

为提高无源滤波器组效能和获得高容量、高性能的有源电力滤波装置,提出了一种串入式串联混合有源电力滤波器,其电路拓扑结构是在传统串联混合有源电力滤波器(SHAPF)的基础上在其逆变器的交流侧上串入一个基波串联谐振装置。由于基波串联谐振电路具有在基波频率处的阻抗近似为零而在谐波频率处阻抗很大且随频率线性增大的功能,从而能使逆变器承受较小谐波电压,因此能增加主回路谐波阻抗,减少系统阻抗和无源滤波器组参数变化的影响。最后,仿真分析和实验结果证实了串入式SHAPF能提高无源滤波器组效能,降低有源部分容量和改善整个滤波装置的滤波性能,是一种高性能、实用的有源滤波装置。

In order to improve the effect of the passive filters and to obtain a high power rating and better performance active power filters,a series-in series hybrid active power filter is proposed.The series-in series hybrid active power filter is a combined system of a traditional series hybrid active power filter and a LC fundamental frequency series resonance circuit which is connected in series between the output filter and the source on the secondary of the couple transformer.The LC fundamental frequency series resonance circuit presents the zero impedance at the fundamental frequency and the linear increment impedance characteristic at the harmonic frequency,especially very high impedance at high frequency,so it can increase the loop harmonic impedance gain for the harmonic load current and the source harmonic suppression.Due to enduring the most harmonic voltage of the series part,the LC fundamental frequency series resonance circuit can decrease the harmonic voltage of the inverter,increase harmonic impedance gain of the main circuit,and avoid the parameters variation of the line and passive filter.Simulation and experimental results verify that the proposed hybrid active power filter can improve the effect of the shunt passive filters,decrease the rating of the inverter,and improve the system filtering performance.