A modified two-switch SEPIC converter and its efficient switching function for grid-connected PV Applications

Abstract

This paper shows a non-isolated modified two switch single-ended primary converter (SEPIC) using voltage multiplier cells. In addition to increasing voltage gain, lowering the duty cycle, and minimising voltage stress across the switches, the proposed enhanced SEPIC converter is made to provide a steady current at the input. The converter will be suited for renewable energy applications due to these enhancements. The proposed two-switch modified SEPIC converter (TSMSC) is validated in this paper by analysing its operation in continuous conduction mode (CCM) and discontinuous conduction mode (DCM). The proposed converter is evaluated against other converters based on a review of its operating modes. The MATLAB simulation is done for 200 W, 20 V/200 V and 50 kHz set up to evaluate the proposed converter. Using the results of MATLAB simulations, the performance of the proposed converter is assessed and validated. This paper also indicates maximum power tracking in a photovoltaic (PV) system using a two-switch modified SEPIC converter and a fuzzy logic controller (FLC). The maximum amount of electricity generated by the PV module is regulated by the fuzzy logic controller. Maximum power point tracking (MPPT) in PV systems under changing irradiation circumstances is described, along with comparisons to the perturbation and observation (P&O) method.