Simulation and analyses of SEPIC converter using linear PID and fuzzy logic controller

Abstract

The DC-DC converter is now widely used in renewable energy conversion systems such as photovoltaic. They serve to adapt the input voltage of a system to the desired output voltage.The SEPIC converter (Single-Ended Primary Inductor Converter) is a converter that has several advantages over other converters of classical structure. The SEPIC converter is classified among the converters with complex topologies of fourth order. The state space average model is used to analyse the behaviour of DC-DC converters to design the appropriate controllers. Various techniques are commonly used to control these converters, such as linear controllers (PI, PID…) or non-linear controllers (fuzzy logic…).Our study is based on the dimensioning and modelling of a SEPIC converter in continuous conduction mode. These converter is submitted to disturbances such as the variation of input voltage, also in this study, the state space average model is established in MATLAB/Simulink environment, and The results are used to design a linear controller PID to regulate the output voltage and compare them with a nonlinear controller fuzzy logic to prove the validity and efficiency of the two models.