SWITCHED CAPACITOR CONVERTER-BASED MULTIPORT CONVERTER INTERGRATING BIDIRECTIONAL PWM AND SERIES RESONANT CONVERTERS FOR STANDALONE PHOTOVOLTAIC SYSTEMS

Abstract

Photovoltaic (PV) systems containing a rechargeable battery as an energy buffer require multiple dc–dc converters for PV panel control and battery regulation, and hence, they are pronto be complex and costly. To simplify the system by reducing the number of converters, this paper proposes the non isolated switched capacitor converter (SCC)-based multi port converter (SC-MPC) for standalone PV systems. The proposed SC-MPC can be derived by integrating a bidirectional pulse width modulation (PWM) converter, series-resonant converter (SRC), and an SCC with sharing switches. PWM and pulse frequency modulation (PFM) controls are employed for the PWM converter and SRC, respectively, to regulate either a battery voltage, output voltage, or input power from a PV panel, depending on power balance among the input, battery, and load. The 150-W prototype was built for an experimental verification, and the results demonstrated the output voltage could be regulated independently on the battery voltage or input port of PV panels.