A virtual inertia Control Schemes for DC Microgrids in Grid connected Mode

Abstract

at microgrids, traditional approach to control the instabilities, is replaced by power electronic (PE) converters, which interfaced with non-conventional sources and battery storage. Due to intermittent nature of renewable sources, there is challenge to control the bus voltage regulation of DC microgrid. Therefore, inertia of DC microgrid is poorer than conventional grid. In this paper, different control strategy including PID controller, virtual capacitor, feedforward control of voltage control loop and current control loop are proposed and compared among of them to improve inertia of the DC microgrid with virtual inertia control circuit which enables the integration of storage and generation with improved dynamics and feed-forward control method are also used for suppressing the disturbances and its effect on dynamic response of DC-μG.