Novel Voltage Regulation Technique for a Three Phase Transformer less Grid Connected Photovoltaic System Using ANN Fractional Order PI Controller

摘要

In view of protecting the environment, the usage of renewable energy is encouraged from the government agencies since last decade. Amongst the available renewable energy sources (RES), the solar energy source is more advantageous. With increase in concentration of distributed generation (DG) using RES with utility grid, new challenges are introduced and they have to be addressed. One of the challenges is voltage regulation, in this paper AI technique namely ANN along with fractional order PI controller is proposed for voltage regulation of a three phase transformer less grid connected photovoltaic system. Three phase transformer less grid connected photovoltaic system is modelled and simulated in MATLAB/Simulink. The simulation results validates the effectiveness in the performance of the proposed ANN fractional order PI controller as compared with conventional PI controller, fractional order PI controller and fuzzy fractional order PI controller when subjected to various operating conditions like change in solar radiation, change in operating temperature and various loading conditions. The simulation was done with the Neural Network Fitting Toolbox of MATLAB..