A novel non-isolated high step-up DC-DC converters for photovoltaic applications

Abstract

This paper proposes a novel non-isolated high step-up DC-DC converters for photovoltaic applications, where voltage is needs to be step-up without using transformer and coupled inductors. In this paper three novel DC-DC converter topologies are discussed in detail, which are suitable for photovoltaic applications. In this proposed converters, two similar inductors are charges in parallel when switches S 1 , S 2 are ON and discharges in series when switches S 1 , S 2 are OFF. The steady state analysis of proposed converters for continuous conduction mode (CCM) and discontinuous conduction mode (DCM) are discussed in detail. The proposed converters have been designed with rated power 200W, input voltage is 24V and switching frequency is 50kHz. The output voltage of the converter-I, H, HI is 168V, 192V, 216V respectively. The simulation results will verify the validity of the analytical design of the proposed DC-DC converters. The proposed converter topologies are simulated in MATLAB/SEVIULINK.