Simulation and experimental performance analysis of micro-grid based distributed energy resources

Micro-grids are becoming very popular due to the plug-and-play nature of their integration. But the high penetration of distributed generators may also create potential instability as it is unable to regulate the system. This paper compares the dynamic performance of a micro-grid when the system load demand is suddenly changed. Multiple distributed sources are used to create a flexible simulation scenario. The simulation is carried out using DIgSILENT software and the results indicate that the micro-grid may collapse when it works in islanding mode. It is found that the installation of storage device can help solve this problem, but both generation and load changes should be considered when determining its capacity. The DG penetration level also shows the impact on the system transient as it can potentially change the level of disturbance. The results of the simulation are validated using an experimental micro-grid setup, having a mix of wind, solar generation and battery storage.