Design, analysis and implementation of DSP based single-phase shunt active filter controller

A simplified current reference control for single-phase shunt active power filter (APF) to compensate the current harmonics and reactive power required by nonlinear loads is being presented in this paper. The key intention of this method is to represent the APF in parallel with nonlinear load as an equivalent conductance. In the proposed technique, first the distorted voltage signal of PCC is made sinusoidal within the controller, to make the compensated source current sinusoidal and in-phase with the source voltage. A self-charging technique is used to regulate the dc-link capacitor voltage to a desired level. The proposed controller is first realized under MATLAB simulink environment and then experimentally verified using a low cost fixed-point eZdsp to show the effectiveness of the controller.