Design and analysis of high gain non-isolated multi port converter for residential PV-battery hybrid system

In this dissertation, a review of Multi-Port converters used for renewable energy applications is provided and a new classification of Multi-Port power topologies is presented. These topologies are compared based on their number and types of DC sources, passive elements, and the control strategy for DC and AC ports. A novel techno-economic indices for assessment of converters feeding variable loads are presented in this work, 21 non-isolated high gain single switch DC-DC converters are reviewed, and an assessment is made using the novel indices for a residential load profile varied from 50 Watts to 3500 Watts. Furthermore, a new non-isolated high gain single switch DC-DC converter is developed using a modified voltage multiplier cell to provide a high voltage gain and reduce voltage stress over the main switch. The operation principle, steady-state analysis, and elements design are discussed. For an input voltage of 36 V, an output voltage of 360 V, and a power rating from 50 Watts to 3500 Watts, the proposed converter was evaluated using simulation software and a laboratory prototype. Lastly. this work proposed a novel multi-stage non-isolated three port converter with a 5H inverter to feed a residential load varying from 50 Watts to 3500 Watts. The proposed three port converter operates in grid-tied and stand-alone power modes. A novel demand-side management algorithm is described. Additionally, a complete control system is discussed. The proposed converter and the control system are validated through simulation for all power modes. The simulation results reveal that the proposed system is viable for Building-Integrated PV Systems.