Synergistic Phase‐Damping Strategy for Transient Control of dVOC‐Based Inverter in Microgrid System

ABSTRACT

Transient stability in Dispatchable Virtual Oscillator Control (dVOC) during interconnection operations in microgrid systems remains a significant challenge. This paper proposes a Synergistic Phase‐Damping Strategy (SPDS) that integrates phase compensation and virtual damping within the dVOC control framework to improve transient stability. The proposed method is validated on a 20‐kV medium‐voltage microgrid comprising three 5‐MW dVOC‐based grid‐forming inverters under three‐phase‐to‐ground fault conditions. The phase compensator mitigates switching‐induced delays in active and reactive power regulation, while the virtual damping mechanism suppresses oscillations through high‐pass‐filtered current feedback. Simulation results demonstrate that the proposed SPDS reduces the post‐fault oscillation frequency from 48 to 17 Hz, shortens the oscillation duration from 200 to 95 ms, and decreases voltage/current recovery times from approximately 89–24 ms compared with conventional dVOC. Furthermore, the proposed strategy improves active and reactive power stabilisation while maintaining stable voltage regulation throughout fault recovery. These results confirm that SPDS significantly enhances the robustness and transient performance of dVOC‐based inverters in medium‐voltage microgrid applications.