2026 Shan Voltage Stability Assessment

Voltage stability margin assessment is essential for the secure operation of renewable-dominated power systems. This paper proposes a path-coupled margin assessment approach that incorporates corrective generator response into static voltage stability margin assessment. The method simultaneously determines the load-growth direction and generator response direction at each continuation step, enabling the assessment trajectory to account for generator response while tracing the system toward voltage collapse. The voltage stability margin is evaluated by the cumulative active load increase along this coupled trajectory, and a feasible redispatch direction is derived to enhance the margin of the current operating state. Additionally, the economic cost of voltage stability enhancement is quantified through a marginal stability cost, providing an economic indicator for additional stability support. Case studies on various test systems demonstrate that the proposed framework effectively captures the impact of corrective generator redispatch on voltage stability assessment, offers guidance for margin enhancement, and quantifies the cost associated with improving voltage stability.