High Step-up Converter for Closed Loop Controller with Three-Winding Coupled Inductor for Renewable Energy Sources

Abstract

Due the increased cost of fuels used for electrical energy generation, present electrical generation units preferred for clean and green type of renewable energy sources. Hence, renewable energy sources such as fuel cells, solar energy, and wind power have been widely valued and employed. Fuel cells have been considered as an excellent candidate to replace the conventional diesel/gasoline in vehicles and emergency power sources. Fuel cells can provide clean energy to users without CO2 emissions. Due to stable operation with high-efficiency and sustainable/ renewable fuel supply, fuel cell has been increasingly accepted as a competently alternative source for the future. The excellent features such as small size and high conversion efficiency make them valuable and potential. Hence, the fuel cell is suitable as power supplies for energy source applications. The generated voltage of the fuel cell stack is rather low. Hence, a high step-up converter is strongly required to lift the voltage for applications such as dc micro grid, inverter, or battery. This concept presents a high step-up converter for fuel cell energy source applications. The proposed high step-up dc–dc converter is devised for boosting the voltage generated from fuel cell to be a 400-V dc-bus voltage. Through the three-winding coupled inductor and voltage doublers circuit, the proposed converter achieve high step-up voltage gain without large duty cycle. This paper proposes a new converter strategy with closed loop control action, with the help of closed loop system attains low steady state error value and system operates in high stability factor for autonomous. Overall performance of the renewable energy system is then affected by the efficiency of step-up DC/DC converters, which are the key parts in the system power chain.