Flyback Forward Topology Based Three Port Dc-Dc Converter For Photovoltaic Systems

System efficiency and cost effectiveness are of critical importance for photovoltaic (PV) systems. This paper addresses the two issues by developing a novel three-port DC-DC converter for stand-alone PV systems, based on an improved Flyback-Forward topology. It provides a compact single-unit solution with a combined feature of optimized maximum power point tracking (MPPT), high step-up ratio, galvanic isolation and multiple operating modes for domestic and aerospace applications. The developed technology is capable of achieving MPPT, high conversion ratio and multiple operating modes whist still making the converter relatively simple, light, efficient and cost-effective. The project is focused on a comprehensive modulation strategy utilizing both PWM and phase-shifted control that satisfies the requirement of PV power systems to achieve MPPT and output voltage regulation. Simulation is conducted to analyze the usage of RLC load in the proposed converter. KeyTerms : DC-DC power conversion, maximum power pointp tracking, phase shift, photovoltaic power system, voltage control.