Some investigations on virtual inertia control of dc microgrids

Abstract

With an increase in the penetration of renewable energy sources, microgrids are evolving as an attractive means to mitigate climate change. Increasing DC loads, the absence of a transmission system due to the shorter distance between generation and consumption, etc. make DC microgrids an attractive alternative. Just like AC systems, DC systems are also sensitive to power balance, information about which is reflected in the DC bus voltage. However, due to advancements in power converter-based generation, the inherent energy storage available in the system is declining. Thus stability issues arise especially when there is a sudden and large change in generation and/or load. newlineTo mitigate the aforementioned issue, virtual inertia emulation virtual capacitor are employed. Existing research works report the distortion of inertial response by the output impedance of the power converter and employ a feed-forward controller to mitigate this distortion. However, the mechanism of this distortion is not fully explained. Furthermore, almost all the existing inertia newlineemulation techniques rely on a first-order differential equation newline newline