Virtual Inertial Control Strategy of Islanding DC Microgrid Storage Converter Based on Rate of Change of Voltage

The new energy islanding DC microgrid system has the characteristics of high power electronization, low inertia and weak damping. The bus voltage is susceptible to power fluctuation. The virtual DC motor (VDCM) method can effectively improve the system inertia and ensure the stability of the bus voltage. Aiming at the problem of long voltage regulation time of VDCM, a virtual inertia control strategy (VI-ROCOV) based on rate of change of voltage (ROCOV) is proposed, which reduces the adjustment time of DC bus voltage and optimizes its transient characteristics while providing inertial support within the stability margin. The virtual inertia control method proposed in this paper realizes the virtual inertia control of the system by improving the voltage feedback loop, which has a wide application prospect for voltage-controlled converters with different topologies.