Simulation and Real Time Implementation of Direct Power Control Applied to Parallel Active Filtering Based on Fuzzy Logic Controller

The present paper proposes a simulation and a real time implementation of a new fuzzy-direct power control (F-DPC) strategy for power quality improvement in shunt active power filter systems. The main objective of the proposed study is to reduce the total harmonic current distortion (THDi) and the instantaneous power ripple. This is done by the replacement of the hysteresis regulators by fuzzy logic rules. The basic idea of these rules is based on the knowledge of the variation in the active and reactive power. In respect to the input fuzzy variables and in a precise instant, the best switching state of the converter is chosen. The strength of this control strategy compared to the conventional DPC is that it is not required to introduce hysteresis controllers and strong control of active and reactive power is achieved. The proposed F-DPC control is simulated using Matlab/Simulink and experimentally validated on a small-scale system, controlled via a dSPACE 1104 single card. The obtained results indicate a closeness between simulation and experimental tests, which proved and verified the effectiveness of the proposed F-DPC control strategy.