Analysis and design for sliding mode controlled buck inverter based on reference sliding surface and state variables surface

This paper presents a detailed and systematic analysis on the design of sliding mode control for the buck DC-AC inverter. The new inverter is composed of two symmetrical current bi-directional buck converters controlled by two independent controllers. The sliding mode motion and domain is researched by dividing the sliding surface into reference sliding surface and state variables surface. A proposed range for sliding surface coefficients is obtained conveniently. The hysteresis band method is used in the system to limit the switching frequency, and a more precise mode is established to evaluate it. The steady-state error in output voltage and the influence of ESR are analyzed by applying the new sliding surface. Finally, the simulation and experimental results validate the analysis in this paper.