Controller Design for Controlling the Inverter Grid in Island Mode

In island mode, when the grid is separated from the rest of the system, the dispersed generation system acts to provide a constant voltage to the local load in the voltage control mode. In this paper .Sliding mode controls method based on the second-order sliding surface and to improve sliding mode control and increase robustness .The system is controlled by an adaptive control against disturbances. In this regard, to overcome chattering and uncertainty from the derivative of the control signal as a controller, which ultimately results in a control signal with integration, up to Adaptive sliding mode controller in the presence of unwanted and uncertain interference and interconnection of grid stability and improvement. Guaranteed output and tracking of the system as well as reducing unnecessary high frequency oscillations in the entire system slowly. According to the simulation results, it is seen that the inverter output waveform has a good ability to follow the waveforms of the voltage and refered three-phase current. This paper is simulated by MATLAB software.