Performance improvement of Standalone PV system by Full-Bridge LLC Resonant Converter

Abstract

The depletion in fossil fuels has turned to increase the rapid exploitation of energy from the Renewable Energy resource. The Renewable Energy resources are intermittent and the reliability can be increased by proper conditioning with power electronic devices. The power electronic devices make use of controllers to change the nature of electrical quantity either AC to DC or vice versa. The DC-DC converters conditions the output energy from sun or wind. Resonant converter works on Zero-Voltage-Switching (ZVS) and Zero-Current-Switching (ZCS). The Full-Bridge LLC resonant converter is a three-element resonant converter that has two inductors coupled together by a capacitor and operates at a high frequency with synchronous self-driven rectifiers. The proposed LLC converter topology minimizes the diode rating enabling the converter to be used for high voltage application. LLC converter ensures switching loss minimization compared to the PWM converters. Photovoltaic panels that harness solar energy make use of MPPT controller and maximum power is extracted. The DC electrical energy fed from the PV panels is conditioned by the Full-Bridge LLC resonant converter that can operate in boost and buck modes. The effectiveness of the converter is calculated through simulation with MATLAB and validation through Hardware-In-Loop.