多智能体系统的交直流混合微网群一致性协同控制

Consensus Cooperative Control of AC/DC Hybrid Microgrids Based on Multi-agent System

针对交直流混合微网群组成结构的复杂性、源-网-荷高度电力电子化趋势等新特点,提出一种基于离散一致性算法的智能多级控制策略,对交、直流微网群的组网形式及群级协调控制进行了详细研究。在用户需求发生变化时,基于多智能体系统构建稀疏通信网络,对微电网群内各分布式设备实现就地分布式控制,邻近智能体间进行通信,节省通信时间;分析了通信延时对一致性算法收敛稳定性的影响。仿真结果表明,当构建的随机矩阵D的对角元素不为0时,通信延时不会对一致性算法的收敛性产生影响,但会影响收敛的形式及时间;另外,多智能体系统可以实现＂即插即用＂,维持交直流混合微网的稳定性。

In accordance with the complex characteristics of the composition of AC and DC hybrid microgrid clusters and the trend of high-power electronization for source-net-load, we put forward an intelligent hierarchical control of AC/DC hybrid microgrid clusters based on the discrete consistency strategy, and researched the form and group-level coordinated control strategy of AC and DC hybrid microgrid clusters in detail. When the user＇s needs change, the sparse communication network is constructed based on the multi-agent system, and distributed control is realized on the distributed equipment in the microgrids. The communication between adjacent agents saves communication time. Finally, the influence of communication delay on the convergence stability of the consistency algorithm is analyzed. Simulation results show that when the diagonal elements of the random matrix D are not zero, the communication delay will not affect the convergence of the consensus algorithm, but it will affect the form and time of the convergence. In addition, the multi-agent system can achieve ‘plug and play＇ and maintain the stability of the AC-DC hybrid microgrids.