Control of Soft Switched Boost Converter using Fractional order controller

Abstract

This paper presents a closed loop control scheme for high gain soft switched boost converter. DC-DC boost converters are universally used in Non-Conventional energy applications. But the high switching frequency increases the power loss due to switching and hence the power converter efficiency decreases. To increase the converter efficiency soft switched boost converters (SSB) are used. But the voltage from input (renewable energy sources) is always not constant; it remains in its specific manner. This varying voltage has to be maintained constant which helps to charge the DC battery. To sustain the output voltage at a steady value, traditionally a PID controller is used for SSB converter. The design of PID controller was carried out using Zeigler Nichols tuning method. Simulation of SSB converters and SSB with controller was developed by MATLAB/SIMULINK. In this paper a fractional order PID controller is proposed for the SSB converter. Fractional order PID controller has additional tuning parameters called fractional integral order and fractional derivative order. The simulation of the SSB converter with fractional order PID controller was also carried out in MATLAB/SIMULINK. For fractional order PID controller implementation, the CRONE toolbox is used. The performances of the SSB with fractional order PID controller were tested under varying input conditions and varying load conditions and the results were reported.