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并联型有源电力滤波器直流侧电压值直接影响谐波补偿特性,文中分析了直流侧电压的取值对补偿特性的影响。首先,分别在单相和三相系统中,针对典型的晶闸管整流加阻感负载为系统负载的负载电流,通过对等效电路的分析,得出完全补偿谐波时所需的直流侧电压理论最小值;然后,当直流侧电压小于理论最小值时,考虑在正弦脉宽调制方法下,通过仿真曲线,给出了补偿后电源电流总谐波畸变率(THD)与直流侧电压之间的定量关系,这些曲线为直流侧电压的选择提供了参考。仿真和实验验证了所述直流侧电压值选取方法的正确性。
The shunt active power filter’s DC voltage directly affects the harmonic compensation characteristics. The paper analyzes the influence of DC voltage on the compensation characteristics. First of all, in the single-phase and three-phase systems, the typical thyristor rectification plus resistive load is the load current of the system load. Through the analysis of the equivalent circuit, the DC voltage theory required to completely compensate the harmonic is obtained Then, when the DC link voltage is less than the theoretical minimum, considering the sinusoidal pulse width modulation method, the simulation curve shows the relationship between the total harmonic distortion (THD) of the supply current and the DC voltage Quantitative relationship, these curves provide a reference for the choice of DC voltage. Simulation and experiment verify the correctness of the DC voltage selection method.