An improved single phase active power filter with optimum DC capacitor

Solid state control of AC power using diodes, thyristors and triacs injects harmonics into the AC mains. These injected harmonics cause low efficiency in the supply system, poor power factor and EMI problems. Active filters have been considered a potential candidate to reduce these problems. This paper deals with an active power-filter (APF) based on simple control with optimum selection of energy storage capacitor. A voltage source inverter with hysteresis current control is employed to form the APF, which uses minimum measured variables to make it cost effective. A diode rectifier feeding a capacitive-resistive load is considered a nonlinear load on AC mains for the elimination of harmonics by the proposed APF. A detailed dynamic model of the scheme is simulated and the effect of different parameters is studied