Sliding Mode Control of Single-Phase AC-DC Boost Converter Using Time-Varying Sliding Surface

Control of AC-DC converter in presence of unknown time-varying load is a complex task due to the strong nonlinearity inherent in the converter structure and to the ones introduced by the load. Traditional sliding mode control using constant sliding surface only be insensitive to matched non-linearity and disturbances. In this paper, a sliding mode controller using time-varying sliding surface to achieve fast output voltage response, disturbance rejection and robust system in the presence of load variation is demonstrated. Simulation results show the effectiveness of time-varying sliding mode control system compare with traditional one.