Fuzzy gain Scheduled PID Controller for Power Quality Enhancement in Grid Connected Hybrid Solar PV-PEMFC Energy System

Abstract

Distributed energy sources are playing a vital role in providing solutions for long term energy needs. Power quality problems become a major concern in grid connected hybrid energy system (HES). The harmonics introduced by the distributed energy systems may lead to output voltage distortion in grid connected system. Hence, it requires an intelligent control scheme for improving the power quality. In this paper, various control schemes for grid connected Solar Photovoltaic (PV) and fuel cell based HES along with its harmonic behavior are proposed. Solar PV and Proton Exchange Membrane Fuel cell (PEMFC) are modeled using MATLAB/Simulink and the responses are also analyzed. Proportional plus Integral (PI) controller, Proportional plus Integral plus Derivative (PID) controller and Fuzzy gain scheduled PID controller (Fuzzy-PID) are used for DC/AC converter control in the grid connected HES. Total Harmonics Distortion (THD) values of the proposed system witnesses that the Fuzzy-PID Controller based converter control technique proposed in this paper improves the power quality than the conventional PI and PID controller.