Simulation and Performance Evaluation of Closed Loop Pi and Pid Controlled Sepic Converter Systems

摘要

The objective of this work is to improve the dynamic response of SEPIC system. This paper deals with modeling and simulation of soft switched Single Ended Primary Inductor Converter (SEPIC) system. SEPIC can step up DC with low ripple in current and voltage. Auxiliary switch with clamped capacitor is added to obtain the soft switching. The modes of operation of the SEPIC system are presented. State space method is used to solve the equations of the proposed circuit. The open loop and closed loop controlled systems with step changes, multiple changes in source voltage are simulated and the corresponding results are presented. A simple PID is applied to SEPIC system to achieve voltage regulation. The response of PI controlled system is compared with that of PID controlled system. The comparison is done in terms of time domain parameters detailed from PI and PID controlled systems. The simulation studies indicate that the response with PID is faster than that of PI controlled system.