Performance Analyses of a Proposed Minimum Phase Bipolar Converter for Solar Photovoltaic Applications

Abstract

This paper analyses the performance of a proposed minimum phase bipolar converter for solar photovoltaic applications. The proposed bipolar converter is designed by combining the Cuk and SEPIC converters after some circuit modification in both converters. These circuit modifications eliminate right half plane zeros of both Cuk and SEPIC converters which are inherently present in these converters. These modified converters are connected in such a way that bipolar output can be controlled by a single switch.The transient undershoots and overshoots eliminated from the proposed bipolar converter which occurs at the instant of change in duty ratio due to non-minimum phase behavior. So, the improved dynamic performance is good for the maximum power point tracking operation. The minimum phase bipolar converter also has the continuous transfer of input power to the output load, which reduced current and voltage ripples. So, this proposed bipolar converter ensures the stable operation of the PV system and also increases the lifetime of PV panels. Due to buck and boost nature, the proposed bipolar converter extracts maximum power from the PV sources in wide range. A laboratory prototype is developed and tested for 600 W. The MPPT algorithm is implemented using the Texas instrument TMS320F28335 processor.