Modeling, Simulation and Performance Analysis of SEPIC Converter Using Hysteresis Current Control and PI Control Method

This paper proposes an analytic study of SEPIC (Single-Ended Primary Inductor Converter) converter by employing Hysteresis Current Control and PI control technique to observe Output Voltage Stability, Total Harmonic Distortion (THD), Power Factor (PF) and Efficiency. SEPIC converter is extensively used in battery operated equipment for its significant feature of stepping up and stepping down voltage without changing polarity. The paper focuses on modeling SEPIC converter in CCM (continuous conduction mode) mode. State-Space Average technique is deployed to model the system mathematically and to implement the PI controller. Satisfactory performance is achieved by adopting both Hysteresis Current Control and PI control. Hysteresis current control method shows THD of 2.798% and efficiency of 90.07% whereas PI control method depicts THD of 17.17% and efficiency of 88%. Power Factor of 0.966 is achieved for PI controller while hysteresis current control method shows a power factor of 0.8208. PSIM software has been used for simulation purpose and the total investigation is analyzed for both methods.