In this paper, an integrated four port DC-DC converter with bidirectional power transfer capability is proposed for connecting two photovoltaic sources with an energy storage element to a dc load. This converter achieves high power density due to its integrated structure and device sharing feature among the ports. Adopted PWM and secondary side phase-shifting control eliminates the circulating current and its associated conduction losses and minimizes the current ripple at input ports. Further, it simplifies the complexity of control by decoupling the control variables of input and output ports. Working of the converter under different operating conditions are verified with a 500-W experimental prototype.
A partially isolated four-port converter is proposed in this paper for interfacing two renewable sources and a storage device with an isolated load. This converter is capable of achieving high power density because of the effective sharing of devices among the input ports. Combined PWM and secondary phase shift control is employed to have a decoupled power flow management of input and output side ports. PWM control is used at the input side for maximum power tracking of renewable sources and battery power management. At the output side, secondary Phase shift control is used for controlling the output voltage. The adopted secondary phase shift control allows the primary switching legs to be operated with 1800 phase shift which results in reduced current ripple at input ports. The working principle of the converter, its output characteristics and control strategy are discussed. Working of the converter and its control strategy is verified through simulation for different input and output conditions. Further, to validate the simulation results, the experimental results of a 500W prototype are also provided.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.