Distributed Secondary Anti-interference Control of Microgrid with Communication Delay

The microgrid structure is complex, the operating environment is diverse, and each subsystem is far away from other subsystems. At present, the microgrid mostly adopts the hierarchical control mode, in which the secondary control mainly realizes the accurate tracking of voltage and frequency. The agent consistency control strategy is applied to the distributed secondary control of microgrid. Through the information interaction between adjacent distributed generators, the control goal is realized, which is conducive to “plug and play”, simplify the system structure and improve the system reliability. However, the microgrid is vulnerable to the influence of external environment, load and distributed power generation during operation, and there is no microgrid central control (MGCC) in the secondary control, so the system has poor resistance to interference; On the other hand, the distance between DGs of microgrid is far, and the communication delay in secondary control cannot be ignored. Firstly, this paper analyzes the impact of the communication delay in the secondary control on the system stability. Considering the communication delay, an interference observer is designed for the matching interference in the secondary control of microgrid. Finally, the microgrid model is built, and the proposed method is verified.