VOLTAGE CONTROL OF BUCK-BOOST CONVERTER USING SLIDING MODE CONTROL BASED ON PI SLIDING SURFACE

Abstract

This paper presents a method to design a sliding mode control (SMC) based on proportional integral (PI) sliding surface for a Buck-Boost converter. The SMC methodologies emerged as an effective tool to tackle uncertainty and disturbances, which are inevitable in most of the practical systems and is a robust feedback control method. However, one of the drawbacks of the SMC is the high frequency oscillation (chattering) around the sliding surface. This paper uses the SMC combined with PI sliding surface to overcome chattering phenomenon. The proposed method is test to voltage tracking control for the Buck-Boost converter. Simulation results in MATLAB/Simulink show that the proposed algorithm is more effective than the SMC internal model and traditional PID with the rising time achieves 0.0022(s), the overshoot converges to zero, the steady-state error is 0.014(s), and the settling time is about 0.0041(s).