A Virtual Inertia Compensation Control Technique for DC Microgrid Voltage Stabilization

In DC microgrid, distributed energy storage devices (DESDs) are crucial for preserving voltage stability. A virtual inertia compensation control (VICC) approach for DESDs in DC microgrid is proposed in this study to increase the inertia of DC microgrid and balance the charge/discharge power. The proposed controller employs an inertia compensation loop in addition to the inner voltage and current control loops. The voltage compensation and inertia terms are additional in the proposed approach to support DC bus voltage stabilization. The proposed controller has two folds advantages: bus voltage error minimization in steady-state condition and voltage oscillation damping in transient condition. The proposed approach also effectively distributes transient and steady-state power between the supercapacitor and battery, respectively. A test microgrid comprising the battery, supercapacitor, distributed generators, and loads is developed in real-time digital simulation (RTDS) platform. The RTDS implementation results show the effectiveness of the proposed VICC approach.