DC Side Ripple Voltage Analysis and Fuzzy PI Control Strategy Research for APF

ABSTRACT

Owing to the problems of DC side capacitor value choice in the application of Active Power Filter (APF), this article presents a technique based on the analysis of the ripple voltage in DC side by graining appropriately the undulation control rate within the range of settings and control DC voltage so that the voltage fluctuation rate can reach minimum value under the condition of specific capacitance which is aimed at getting good compensation effects. In order to achieve the stability of the DC side capacitor voltage control, we introduce a new technique on the DC output voltage deviation square values of adaptive fuzzy PI control. Meanwhile, a Space Vector Pulse Width Modulation (SVPWM) is used to conduct optimization design for the DC side voltage waveform. The simulation results show that using this method reduces the DC voltage ripple and achieves steady DC output voltage.

Keywords:

DC side ripple voltage, Active Power Filter (APF), New PI control, Space Vector Pulse Width Modulation (SVPWM).