Enhanced Transient Control of Grid-Forming Inverters: A Dual-Objective Strategy for Power Angle Stabilization and Fault Current Limiting

This paper addresses the transient stability of gridconnected inverters under high renewable energy penetration by proposing a dual-objective coordinated control strategy for power angle stabilization and fault current limitation. A third-order active supporting virtual synchronous generator model is developed, integrating a control architecture with virtual power angle compensation in the power loop and dynamic voltage regulation in the voltage loop. The innovative Kon triggering coefficient enables adaptive switching between control modes. Transient power angle dynamics analysis and the equal-area criterion validate large-disturbance stability, while circuit equation modeling and vector analysis reveal the synergy between enhanced voltage support and fault current limitation. Case studies on a photovoltaic plant demonstrate the proposed transient control strategy's excellent effectiveness in mitigating three-phase symmetrical short-circuit faults.

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