Comparative Study of Three Phase Four Wire Shunt Active Power Filter Topologies based Fuzzy Logic DC Bus Voltage Control

Abstract

In this paper, a comparative study based fuzzy logic DC bus voltage control for three phase four wire shunt active power filter for two different inverter topologies, three-leg splitcapacitor topology (TLSC) and four-leg inverter (FLFB) are proposed. Identification of reference currents will be developed by classical extraction filters based on pq theory in the first section of the paper. DC-bus voltage control in three-phase four-wire shunt active filter is treated by a fuzzy logic control. A comparison of the proposed method against the conventional proportional integral is illustrated with two different inverter topologies through simulation results and a clear advantage of the fuzzy logic control can be observed. Moreover, the switching pattern of the inverter is generated by a modulated hysteresis current controller. All simulations have been realized in the same conditions so results can be compared with each other. The effectiveness of the proposed method is verified by MATLAB software.