A Shunt Active Power Filter's Pi and Fuzzy DPC Control Comparison

In this paper, an improved form of direct power control (DPC) for a shunt active power filter (SAPF) system is presented. The optimization is achieved by applying a fuzzy logic strategy to the DC link voltage control strategy. The three main objectives are to ensure reactive and harmonic compensation in the power grid, to achieve the lowest possible DC voltage error during the transient state, and to eliminate or significantly reduce the influence of unwanted harmonics. The static and dynamic behaviors of DPC and F-DPC are presented. The results of F-DPC simulation are compared with those of conventional DPC. Due to the high level of power quality improvement, F-DPC can become an interesting alternative over traditional DPC technique for SAPF.