Enhancing the export capability of renewable energy bases through two-stage small signal stability-constrained optimal dispatch

The increasing penetration of renewable energy sources (RES) into modern power systems introduces small-signal synchronous stability challenges and constrains the power export capacity of renewable energy bases. To overcome these challenges, this paper proposes a two-stage coordinated dispatch strategy for energy storage and renewable generation, explicitly incorporating small-signal stability constraints. A generalized short-circuit ratio (gSCR) index is adopted to quantitatively evaluate the system's stability margin. To efficiently address the resulting nonlinear and non-convex optimization problem, a semidefinite programming (SDP)-based reformulation is developed, enabling tractable computation while ensuring stability compliance. The effectiveness and practical value of the proposed approach are demonstrated through detailed case studies on a realistic 7-bus renewable energy base system. Simulation results indicate that the proposed method increases the renewable energy export capacity by 7.79% while maintaining the required stability margins.