Stability control method for hybrid AC-DC transmission systems considering cross-region multi-energy coordination

Abstract

China has built the largest hybrid AC-DC power systems with the highest voltage levels in the world. How to effectively guarantee the stable operation of the hybrid AC-DC power systems is a critical undertaking and technical demand. In view of the stability problems of hybrid AC-DC transmission systems with a high percentage of wind power, a hybrid AC-DC transmission system's stability control method that considers cross-region multi-energy coordination is established in this paper. Aiming at the uncertainty of a high percentage of wind power, the dynamic inversion method is used as the inner loop for robust control, and the battery energy storage and regenerative electric boiler are used as multiple energy sources to coordinate, and the outer loop robust control is used for uncertainty compensation. The hybrid AC-DC weak-sending terminal system with wind power is analyzed and designed by μ-synthesis based on the control, and a stability control method for hybrid AC-DC transmission systems, considering cross-region multi-energy coordination, is established. Simulation results show that the model proposed in this paper can guarantee the robustness of the dynamic inversion method and improves the control performance of AC-DC transmission systems.