Comparison among PPF, APF, HAPF and a combined system of a shunt HAPF and a shunt thyristor controlled LC

To compensate the reactive power and current harmonic issues of the distribution power system, different power filters were developed. In this paper, three conventional power filters and a proposed compensator will be discussed, designed and compared to solve the reactive power and current harmonic problems of a three-phase three-wire power system. These conventional filters are: passive power filter (PPF), active power filter (APF) and hybrid active power filter (HAPF). The proposed compensator (HAPF//TCLC) is a combined configuration of a shunt HAPF and a shunt thyristor controlled inductor capacitor (TCLC). These compensating devices of PPF, APF, HAPF and HAPF//TCLC are examined about the ability of dealing with excessive compensating reactive power due to the loading change. Moreover, PSCAD simulation results are given in order to verify that the proposed compensator has good compensating performances on dealing with both designed and excessive load reactive power under low inverter rating.