Enhanced Time-Domain Response of a SEPIC Triple-Lift Converter System

Voltage lifting techniques are employed invariably in high step-up applications to provide an enhanced voltage transfer and power gain, as it alleviates the problems encountered in operating the converter at an extreme duty ratio. Ripple content present in output of power converter would tend to affect the load performance. Hence soft-switched single ended primary inductor converter (SSSEPIC) is proposed between solar system and load to curtail the ripple content. This work deals with the simulation of SEPIC triple-lift converter system (SEPIC-TLCS) in closed loop mode of operation. The voltage ripple in output is minimized by connecting a T-filter. The prime objective of this work is to obtain a good regulated dc output voltage. The simulation studies are performed using Matlab Simulink models developed for proportional integral controlled closed loop SEPIC triple-lift converter system (PI-CLSTLCS) and fuzzy controlled closed loop SEPIC triple-lift converter system (FC-CLSTLCS). Time domain parameters are compared and comparative results illustrate the superior performance of FC-CLSTLCS. Therefore it can be used as a substitute for the existing dc-dc converters.