Transient Search Optimization Based Fuzzy-PI Controller for MPPT of Standalone PV System

Abstract

In standalone or grid-connected PV systems, maximum power point tracking (MPPT) methods are essential since they control DC boost converter's duty cycles, thereby extracts the maximum power possible from such systems. Moreover, the power supplied by the PV array is a nonlinear function of its terminal voltage and current, which require a successful MPPT to pursue the maximum power point (MPP) regardless of operating conditions. This paper suggests a Transient Search Optimization (TSO) based on self-tuning fuzzy-Proportional Integral (PI) controller for MPP pursuing in the standalone PV system. The PI regulator is utilized to regulate to the PV voltage in relation to a reference voltage generated by TSO method in which its gain parameters are tuned using a fuzzy expert system. The simulation was done using MATLAB/SIMULINK for standard and different test conditions (STC and DTC). The obtained results reveal that the maximum power delivered to the load has been achieved with an efficiency of 100% at STC, while it was achieved concerning variable irradiation at DTC