Design of a Robust Voltage Controller for a DC-DC Buck Converter Using Fractional-Order Terminal Sliding Mode Control Strategy

This paper suggests a fractional-order terminal sliding mode control (FO-TSMC) method for the output voltage regulation of a DC-DC Buck (Step-Down) converter influenced by disturbances, such as the changes of input voltage and load resistance. A this kind of a new fractional sliding surface is designed to avoid the drawback on integer-order (IO) terminal sliding mode control (IO-TSMC) method and guarantee the converter attain stable-state readily without chattering even if it undergoes arbitrary random disturbances. The proposed FO-TSMC controller's performance is compared against to both IO-TSMC and traditional SMC control approaches. Computer simulation results display that the novel FO-TSMC approach results in evenhanded output voltage control under different load situations and wide input voltage changes.