MPPT Based Fuzzy-Logic Controller for Grid Connected Residential Photovoltaic Power System

Abstract

This paper focuses on control strategy of the direct current voltage reference of a voltage source converter based on fuzzy logic controller. A PV array is connected to residential system via an inverter. The inverter control system uses three controllers. The first one is a Maximum Power Point Tracking (MPPT) controller. Based on fuzzy logic system scheme, this MPPT system automatically varies the VDC reference signal of the inverter VDC regulator in order to obtain the DC voltage which will extract maximum power from the PV string. The second controller regulates the DC link voltage to its reference value and the third controller regulates active and reactive grid current components. The active current reference is the output of the DC voltage controller. Result from the simulation shows that the fuzzy controller is able to varies the VDC reference signal of the inverter VDC regulator in various irradiation condition to extract maximum power from the PV string.