High Step-Up Three-Port DC–DC Converter With Few Limitations in Performance Suitable for Stand-Alone Renewable Energy Applications

This article introduces a three-port dc–dc converter including two input sources with continuous input current; one of them is a bidirectional port to ensure continuous charging and discharging of battery storage. The proposed converter boosts voltage with a higher gain than the references, which use more components. The voltage stress on the diodes and the size of the main inductor are also compared to other converters, demonstrating the superior properties of the proposed converter. In addition, the article contains new kinds of comparisons to review multiport converters from other point of views like performance limitations and number of operation modes. The converter is designed in a way to comprise a common ground between the sources and the load. The possibility of operation in battery-alone mode enhances its reliability and certainty for various standalone applications of renewable energy systems. To validate the feasibility and effectiveness of the proposed converter, an experimental prototype with a nominal power of 300 W was developed. The conducted experiments involve dynamic performances of the converter during sudden changes in the load and switching between different modes. The experimental results confirm the functionality and practicality of the proposed converter.