Direct power control of two-level grid-connected converters using fuzzy logic

Abstract

This dissertation focuses on the synthesis and simulation of a two-level three-phase grid- connected inverter system. The study compares two control strategies: the conventional direct power control (DPC) and an artificial intelligent fuzzy logic-based DPC approach (FDPC). The FDPC technique replaces the switching table, hysteresis comparators, and sector identification used in classical DPC with a fuzzy logic controller. Simulation results conducted using MATLAB Simulink demonstrate the proposed fuzzy controller’s efficacy in independently regulating active and reactive output powers. Com- parative analysis of simulation results reveals that FDPC outperforms conventional DPC in terms of dynamic response, robustness, and power quality due to reduced total har- monic distortion (THD).