考虑通信时延的直流微电网分布式储能单元协调控制

针对计及通信时延的直流微电网分布式储能系统多储能单元之间的协调问题，提出了一种模型预测控制策略。首先搭建多储能单元状态空间模型，设计多储能单元的模型预测控制及其电流期望轨迹。然后分析计及通信时延的一致性规律，补偿时延引起的荷电状态偏差。进而通过求解以快速跟踪电流动态期望值及控制信号变化最小为目标函数的最优解，保证系统直流母线电压稳定，实现各储能单元间协调稳定运行以及基于荷电状态的动态一致均衡。最后利用Matlab/Simulink仿真平台，验证所提控制策略在计及通信时延的情况下储能充、放电过程以及源、荷波动下的有效性和稳定性。

Coordinated control method of distributed energy storage units in a DCmicrogrid considering communication delay

A model predictive control (MPC) strategy considering communication delay is proposed to solve the coordination problem among multiple energy storage units of a distributed energy storage system in a DC microgrid. First, a state space model of multiple energy storage units is built, and the MPC and current expectation trajectory of multiple energy storage units are designed. Then the consistency law of communication delay is taken into account to compensate for the SOC deviation caused by communication delay. Then, by finding the optimal solution of the objective function with the fast-tracking current dynamic expected value and the minimum change of the control signal, the DC bus voltage of the system is guaranteed to be stable. Also the coordinated and stable operation between the energy storage units and the SOC-based dynamic consistent balance are realized. Finally, the Matlab/Simulink simulation platform is used to verify the effectiveness and stability of the proposed control strategy in the charging and discharging process of energy storage and source and load fluctuations taking into account the communication delay.This work is supported by the National Natural Science Foundation of China (No. 61873159).