Distributed Secondary Cooperative Control of Multiterminal AC/DC Hybrid Distribution Networks Considering Information Uncertainty

Distributed consensus control(DCC)has emerged as a new approach for the secondary control of AC/DC hybrid distribution networks because of its flexible coordination capability. However，traditional DCC does not account for the random time-varying delay and data packet loss in the actual communication environment，making it difficult to achieve stable tracking of consistent desired goals in nonideal communication environments. Therefore，this paper proposes a distributed secondary cooperative control strategy considering information uncertainty. The unified equivalent of time-varying delay and data packet loss is achieved by the variable accumulation compensation mechanism. Furthermore，an estimator with zero steady-state error is constructed based on the surplus consensus algorithm(SCA)，and its convergence is deduced and proved. On this basis，an SCA-DCC controller whose steady-state convergence performance is not disturbed by communication constraints is designed to realize accurate average voltage-deviation regulation and proportional distribution of active power in nonideal communication environments. Then，the parameters of the SCA-DCC controller are optimized with the time delay tolerance as the index to ensure system stability under various communication conditions and enhance the robustness of the controller. The simulation results show that the proposed control strategy can better overcome the negative effects of time-varying delays and data packet loss under conditions with various power disturbances and faults than existing control strategies. In addition，it not only reduces the steady-state voltage deviations by 73.08%—85.25% while maintaining better dynamic response performance but also has high control accuracy and robustness against disturbances. © 2024 Tianjin University. All rights reserved.