Virtual Inertia Parameter Design for Low-Voltage Distribution System Based on Feasible Region

The low-voltage distribution system (LVDS) is confronted with high-frequency oscillation instability issues due to the negative impedance of constant power loads. To address this, a virtual inertia equivalent modeling method is proposed in this paper, and a reduced-order model along with its transfer function for the LVDS is established. On this basis, a method for solving the feasible region of virtual inertia parameters is proposed. Through this feasible region, reasonable droop coefficients and corner frequencies can be designed from the perspective of small-signal stability. Finally, the switching model of LVDS and its equivalent model are built using the RT-box HITL platform. Multiple sets of experimental results have verified the effectiveness of this feasible region.