Distributed Optimal Energy Management for We-Energy Considering Operation Security

Fei Teng, Yuxin Zhang, Tiankai Yang, Tieshan Li, Yang Xiao, Yushuai Li

Abstract: With the development of the autonomous and supply-production-sale integrated We-Energy (WeE), the Energy Internet performs a fully distributed structure, and the fluctuation of power injections cannot be neglected. This article investigates an energy management problem with operation security constraints for WeE-based Energy Internet in a distributed way. Firstly, considering the complex power injections caused by the high flexibility and strong robustness of WeE, the steady-state voltage security region (SVSR) for WeE is established. The voltage excursion index for WeE is proposed to quantify the voltage security margin between the operation state and the security boundary. Secondly, the SVSR-based energy management model for WeE with linear coupled equations and box inequalities is constructed to minimize the operation cost. Thirdly, a fully distributed energy management strategy is proposed based on the alternating direction method of multipliers (ADMM). Furthermore, the discrete nonlinear system analysis theory proves the proposed strategy's convergence and optimality. The energy management strategy guarantees operation reliability and eliminates the risks of voltage off-limit. Finally, the effectiveness of the fully distributed energy management method with SVSR for WeE is verified by simulation results.