Multiport DC/DC Converter for Stand-alone Photovoltaic Lighting System with Battery Storage

Photovoltaic energy has nowadays an increased importance in electrical power applications. However, the output power provided via the photovoltaic conversion process depends on solar irradiation and temperature. Therefore a multiple-input DC/DC converter is proposed for stand-alone photovoltaic lighting system with battery storage in this paper. Compared with the traditional stand-alone photovoltaic system, which merely use one muti-input biderictional DC/DC converter control the battery charge or discharge effectively, protect battery and prolong its natural life as well as have high conversion efficiency and low cost for photovoltaic lighting system. Muti-input converter implements bi-directional energy transfer in the system, so the key of energy management is control bi-directional converter effectively. Finally the simulation and experimental verifications are also presented.