Partial Buck-Boost Resonant Power Converter for Residential PV Applications

This paper suggests the implementation of the partial power converter for PV power processing instead of full power converter for better system efficiency and robustness. Processing a percentage of the total power, instead of processing the full power, improves system efficiency and reduces system cost and size. In this paper, an input parallel output series (PISO) buck-boost partial power converter is presented. The first stage of the system is controlled to ensure that PV panels are operating at the maximum power (MP). And the second resonant stage is controlled to fix the dc-bus voltage. Although the system has five-switches, four of them are operating in zero voltage and current switching, to eliminate switching losses of the system. Converter sharing percentage is adjusted to ensure optimum operation of the complete PV system. System analysis and simulation are demonstrated through the manuscript. Experimental and more comparative analysis will be presented in the final version.