The Unnecessaries of Harmonic and Reactive Current Detection for Active Power Filters——Part Ⅰ
Wang Guangzhu (Shandong University Ji’nan 250061 China )
The effects of the harmonic and reactive current detection on the compensation accuracy for active power filters(APF) is analyzed in the paper in terms of the closed-loop control system of the DC side capacitor’s voltage and the current of the APF. It is concluded that the harmonic and reactive current detection behave as just a feed-forward signal in this closed-loop, and it is incapable of improving the compensation accuracy in steady-state. The dynamic performance of the APF is studied and compared by means of the theoretical analysis and simulation based on the RMS dynamic mathematical model of the control system. It is shown that the harmonic and reactive current detection may benefit the transient response of the compensating current to some extent when the active components of the nonlinear loads fluctuate, but does not improve at all the transient response of the compensating current when the harmonic and reactive components of the nonlinear loads is varied. So it is not necessary to detect the harmonic and reactive current for an APF.
【CateGory Index】： TN713.8;TM933.1