Performance of Grid Connected DG Inverter System by Using Intelligent Controllers

Abstract Recent development in the small scale power generation using distributed energy resources combined with application of power electronic systems initiated the researchers to the concepts of future power generation technologies such as microgrid. The paper presented involves the control techniques required for microgrid operation and implementation of a simple control strategy in a microgrid model realized with MATLAB. To demonstrate the operation of a microgrid in Grid connected mode and intentional islanded mode, a simulink model has been designed with necessary parameters by connecting with the main grid allowing the sharing of different laods with reference to Grid connection and disconnection. An islanding-detection algorithm has been used to act as a switch between the two controllers and this has minimised the effect of losses in the time of transistion. A reclosure algorithm has been used for the DG to resynchronize the inverter voltage with the grid.