基于一致性协议的孤岛微网分布式二次调频

Distributed Secondary Frequency Regulation for Island Microgrid Based on Consensus Protocol

针对孤岛微网二次调频控制需求,提出了一种基于一致性协议的多代理控制方法。该方法不但能够通过稀疏通信和分布式控制实现频率同步、频率无差和功率共享目标,而且当分布式电源(DG)的输出功率达到临界值时,通过在控制器前增加逻辑判断环节,有效解决了DG的功率约束问题和饱和器控制所引发的控制目标冲突问题,在临界约束状态下也能实现一致性频率控制。通过李雅普诺夫直接法对该控制方法在系统中的稳定性进行了详细分析,结果表明控制系统是渐进稳定的。最后,在DIgSILENT/PowerFactory平台上,通过5节点孤岛微网模型,验证了所提控制策略的有效性。

For the secondary frequency regulation of the island microgrid, a multi-agent control method based on the consensus protocol is proposed in this paper. The method can achieve the goals of frequency synchronization, frequency non-difference, and power sharing by sparse communication and distributed control.Besides, when the output power of the distributed generator(DG) reaches the critical value, the power constraint problem of the DG and the conflict between control objectives caused by saturator control can be solved by adding a logic judgment loop in front of the controller, so that the consistent frequency control can be realized under the critical constraint state. The stability of the control method in the system is analyzed in detail by Lyapunov direct method, and the results show that the control system is asymptotically stable. Finally, the effectiveness of the proposed control method is verified by a 5-node island microgrid model on DIgSILENT/PowerFactory platform.