A High Gain Common Ground Bidirectional Buck/Boost DC-DC Converter Based Solar PV Inverter with ESF Support and Grid Synchronization Capability

This work presents a common ground bidirectional high gain transformerless converter with energy storage facility (ESF) support for residential application to feed power to home loads as well as to inject power into the grid. In addition to having a high voltage conversion ratio, the switched capacitor cell offers a substantial advantage, which is a diminution in the values of all passive components without disrupting the route that ground takes from input to output. The typical power conversion unit (PCU) for solar PV array, makes use of either a low frequency or high frequency transformer in order to balance out the voltage disparity and gain that exists between the grid and the low voltage solar PV panel. This, in return, causes an increase in the total mass and energy loss of the PCU system. In view of this, the objective of this study is to investigate the practicability of a non - isolated common ground solar photovoltaic power conversion unit (PCU) that is supported by energy storage facility support (ESF) and is designed for use in residential rooftop installations. A conventional boost DC converter is used to regulate the solar PV system’s greatest power point, and the power that is produced is supplied into the EFS in order to ensure the effectiveness with which, the solar PV system’s energy is used. On the contrary, it is the responsibility of the ESF to determine the mode of operation of the PCU and to rectify all power dynamics that may have developed across the whole of the PCU. Particularly, with constant power control scheme provided by the front-end inverter, the proposed PCU acts as a constant power source/sink at grid end, so this eradicates the detrimental effect of the solar fluctuation on the grid. On the other side, when there is no grid available, the PCU behaves as a constant voltage source and continues to feed the home loads. The architecture, configuration and functioning of the given PCU are validated using MATLAB Simulink, and the pertinent findings are provided as corroborating evidence for the stated performance of the offered PCU.