Experimental validation of ZVS boost converter with resonant circuit for low power photovoltaic applications

Abstract

This thesis presents mathematical analysis of the photovoltaic (PV) model along with the comprehensive analysis of a resonant circuit based soft switching boost converter for PV applications. The converter maintains a Zero Voltage Switching (ZVS) turn-on and turn-off of the main switch, and Zero Current Switching (ZCS) turn-on and ZVS turn-off of the auxiliary switch due to the resonant circuit incorporated in the same. Detailed operation of the converter, analysis of various modes, simulation as well as experimental results for the design has also been aptly presented. Switching and conduction losses across the switches and the diodes have been calculated and analysed, and some light has also been thrown on the design of inductor used in the practical implementation. The Perturbation and Observation (P&O) method has been used in order to track the Maximum Power Point (MPP) from the PV panel. This soft switching technique has been aimed to be used in telecom services where there is a necessity of 48 V regulated DC bus voltage. The systems are modelled and simulated in PSIM 64 bit version 9.0 environment and is experimentally validated in FPGA environment. Thus, the feasibility and the effectiveness of the system were also proven through theoretical analysis and experimental results.