Comparison of improved converter topologies for high voltage gain

Abstract

This paper presents a comparison between a conventional boost converter and three improved topologies of DC-DC converter. A high step up DC-DC converter acts as an interconnection between DG systems. Three improved topologies proposed in this paper are simulated in a simulation environment. The conventional boost converter presents many drawbacks. It does not have any control over an input current. It draws considerable amount of input current from the source at a high duty cycle. A high amount of current can cause serious problems to the components used in a DC-DC converter. The voltage across the switch is nearly equal to the output voltage in a conventional boost converter. This creates the stress problem for the switches employed in a DC-DC converter. These problems can be easily overcome in improved topologies. The improved topologies improves electrical parameters like voltage gain, power loss and switch voltage stress. The gain of DC-DC converter is modified with the help of extra components. The improved topologies become an attractive feature for use with DG systems due to improvement in electrical parameters. The comparison is made between conventional boost converter and various improved topologies. The efficiency is evaluated for different topologies over a wide range of duty cycle. The efficiency curves are plotted for conventional boost converter and improved topologies. The evaluation of efficiency for a wide range of duty cycle confirms the effectiveness of the improved topologies presented in this paper. The simulation results are obtained for an input voltage of 12V. The input voltage is stepped up to an output voltage of 100V which can be used for various applications.