MODELING OF FRACTIONAL ORDER SLIDING MODE CONTROL FOR FRACTIONAL ORDER SEPIC CONVERTER

Abstract

This thesis presents fractional order sliding mode control (FOSMC) for fractional order single-ended primary-inductor converters (FOSEPIC). Integer order single ended primary-inductor converter is not accurate, has low flexibility, defined uni formly and has low degrees of freedom. Like the conventional SMC methods, the proposed FOSMC method employs a sliding surface function based upon the input current error only. We achieve output voltage control indirectly by controlling the input inductor current. This investigation of a fractional order SMC on a fractional order SEPIC highlights the merits of the fractional order systems and fractional order controllers. The input current reference is generated by a proportional integral (PI) regulator. The performance of the proposed FOSMC approach is investigated by using a MATLAB/SIMULINK program. The buck/boost modes for voltage regulation are studied by varying the following parameters: the input voltage, orders of the system, order of the controller and load resistance. Simula tion results are presented for fractional order SEPIC converter of fractional orders (0.25, 0.35, 0.52, and 0.65) and FOSMC of fractional order 0.35