考虑状态受限和一致性的微电网二次控制

Secondary control for microgrid considering state constraint and consensus

中文关键词  微电网  多智能体系统  自适应模糊系统  障碍Lyapunov函数  Backstepping

英文关键词  microgrids  multi-agent systems  adaptive fuzzy system  barrier Lyapunov function  Backstepping

中文摘要

      为解决交流微电网下垂控制产生的偏差问题, 本文采用二次控制对分布式电源输出电压和频率进行调节. 将微电网看成分布式多智能体系统, 智能体间通过稀疏网络进行通信, 运用多智能体一致性协议, 本文提出一种基 于障碍Lyapunov函数和自适应模糊系统的二次电压和频率控制器. 采用障碍Lyapunov函数设计控制器, 不但能保 持系统的稳定性, 还可使输出的电压和频率限制在预设的范围内. 采用自适应模糊系统可对系统中的一些参变量的 变化进行估计, 提高了控制器的鲁棒性. 本文给出了严格的稳定性证明. 通过对负载变化, 以及拓扑结构改变等的 仿真测试, 验证了所提方案的有效性.

英文摘要

      In order to solve the deviation problem caused by the droop control of the AC microgrid, the secondary control is adopted to adjust the output voltage and frequency of the distributed generations. The microgrids are considered as distributed multi agent systems, and the agents communicate with each other through a sparse network. By using the multi agent consensus protocol, a secondary voltage and frequency controller based on the barrier Lyapunov function and an adaptive fuzzy system is proposed. The controller designed by the barrier Lyapunov function cannot only maintain the stability of the system, but also limit the output voltage and frequency within the prescribed range. The adaptive fuzzy system can be used to estimate the changes of some parameters in the system, which improves the robustness of the controller. The strict proof of stability is given. Through the simulation test of the load change and the change of the topology structure, the effectiveness of the proposed control scheme is verified.