Simulation of microgrid in the perspective of integration of distributed energy resources

In this paper a typical microgrid is modeled and simulated based on several logical assumptions and the same is studied for steady and transient state analysis in grid connected and islanded mode with critical and non-critical load selectivity in the perspective of integration of distributed energy resources. The authors present the simulation of microgrid by Powergui interfacing of Simulink using Matlab software in such a manner that a study of waveforms of voltage, current and power in selective points in the microgrid system is possible. Since microgrid is an interconnected system of distributed energy resources, utility grid and loads; there are immense chances of fluctuation of any one of those components and the disturbances are to be analyzed through simulation in planning stage for successful on-site operation in future. Among many factors and type of disturbances and response, as a typical case, the present microgrid model is studied for step change in grid voltage and the corresponding response in the line currents are presented with their waveforms showing peak responses, settling time, rise time etc. using LTI viewer toolbox of Simulink, Matlab. The results are discussed and analyzed for microgrid modeling in the perspective of integration of DERs.