Droop Based Voltage and Frequency Controller for an Islanded AC Micro-Grid

Micro-grids compared to conventional grids bring its own advantages and disadvantages. Micro-grids create room to tailor the quality of power delivered to the end user and also encourages the utilization of creating a favorable environment for energy efficiency and small scale renewable investments. But due to the very low inertia present in the micro-grids, the voltage and frequency can change rapidly which makes the controlling function a bit challenging. Therefore, the conventional droop method that is used to dispatch the demand at rated voltage and rated frequency in conventional grids, is challenging to be used in micro-grids. This paper includes the attempt to execute the controlling function in a newer and better droop control method. The project was initiated to implement with DC power sources as the Distributed Energy Sourcesare based on two inverters. Depending on the power requirement, the droop setting is changed to gain the governor action in this system. The controlling action of the newer droop method is compared and analyzed through MATLAB SIMULINK simulation and with the conventional droop control mechanism.