Investigation of <scp>VSG</scp> Control Strategy Based on Adaptive Regulation of Active Power Deviation Coefficient

Abstract Grid‐connected inverters controlled by virtual synchronous generator (VSG) technology are susceptible to transient power angle instability during grid voltage sags. This instability can lead to steady‐state power deviations, dynamic oscillations in the VSG output, and potentially system instability in severe cases. To address this, this paper proposes an investigation of VSG control strategy based on adaptive regulation of active power deviation coefficient. First, based on an equivalent analytical model of conventional VSG control, the current characteristics and transient power angle behavior during grid voltage sags are examined. The relationship between the dynamic response characteristics of active and reactive power and transient stability is derived. Subsequently, a segmented adaptive regulation strategy for the active power deviation coefficient is proposed. This strategy achieves suppression of power angle overshoot by controlling the active power deviation; meanwhile, the inclusion of a reactive power feedback term in the reactive voltage loop ensures robust voltage control for the grid‐forming inverter. Research results demonstrate that the proposed strategy reduces power angle overshoot by 4.8% and 40% under grid voltage dip conditions of 30% and 80% depth, respectively, compared to conventional methods, effectively achieving the goal of zero overshoot and significantly enhancing the system's transient stability. © 2026 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.