Distributed Event-triggered Secondary Coordinated Control of Microgrid Based on Disturbance Observer

Distributed secondary control strategy of microgrid has high reliability and is easy to realize "plug and play", but its structure is complex, and it is easy to be affected by power supply, load and environment. At present, many scholars introduce multi-agent consistency control method into the secondary control of isolated island microgrid. Through the information interaction between adjacent distributed generators, the voltage and frequency can be accurately tracked and the power can be reasonably distributed. However, there is no microgrid central control (MGCC) in the secondary control, the global information of the system cannot be obtained, and the anti-interference performance of the system is poor. In this paper, a disturbance observer is designed for the matching disturbance in the secondary control of microgrid, such as harmonic disturbance and disturbance caused by the change of system parameters. The observed values are used to compensate the interference of the system. At the same time, in order to improve the computing speed and save communication resources, the event-triggered mechanism is introduced. Finally, the microgrid model is built in MATLAB/ SIMULINK and the method is verified.