The sliding mode control method of grid-connected inverter applied to three-phase intermittent power supply

The control system of grid-connected inverter is the most important part in achieving transformation and transmission of power from the intermittent power sources. This article applies the theory of sliding mode control to the grid-connected inverter, and makes improvement on the index reaching law. So that the reaching speed is proportional to the square of sliding surface S, and the chattering of sliding mode control system is effectively weakened. Simulation results show that this control method has a very fast response speed, and insensitivity to external interferences. This control system enables the output current to accurately and quickly track the reference current, and makes effective improvement on the dynamic and static performance of grid-connected inverter.