Coordinated frequency and voltage control method for island microgrid based on event-triggered mechanism

Abstract

The invention discloses an event trigger mechanism-based frequency-voltage coordinated control method of an island micro-grid, is suitable for the problems of frequency adjustment and voltage adjustment of distributed energy sources of the island micro-grid with a drooping characteristic, and belongs to the field of power system control. On the basis of constructed distributed event trigger mechanism and coordinated control strategy, the distributed energy sources in the island micro-grid determine active and reactive power adjustment quantities through information interaction with neighbors, so that frequency and voltage amplitudes of the grid can be restored into preset values again after disturbance; and meanwhile, the condition that active and reactive power requirements of the micro-grid are reasonably distributed into all distributed energy sources is ensured. The event trigger mechanism-based frequency-voltage coordinated control method of the island micro-grid has the advantages that transmission of information among the distributed energy sources according to the ''requirements'' is achieved on the basis of ensuring that frequency and voltage adjustment and control tasks of the island micro-grid are effectively completed, the pressure of a communication network is reduced, network congestion is avoided and safe and stable operation of the island micro-grid is ensured.

Description

technical field [0001] The invention relates to the field of power system control, in particular to an event-triggered mechanism-based frequency and voltage coordinated control method for an island microgrid. Background technique [0002] In recent years, due to the advantages of distributed energy such as environmental protection, renewable, and wide distribution, more and more of them have been integrated into the current power network system, making the traditional power system face new changes and challenges, thus giving birth to " concept of microgrid. A microgrid is a low-voltage power system that includes distributed energy sources, energy storage devices, and loads. It can work in both grid-connected and islanded modes. When it operates in the island mode, the frequency and voltage amplitude of the microgrid must be maintained at a level that enables the system to operate safely through its own regulation mechanism, and at the same time ensure that the load's active...

AI Technical Summary

Problems solved by technology

In the face of island microgrids containing a large number of distributed power sources, centralized frequency and voltage control methods have many disadvantages: poor dynamic performance, expensive control and communication centers, low robustness and scalability

[0004] However, the existing distributed frequency and voltage control strategies of isolated island microgrids require each distributed energy source to continuously exchange information with its neighbors in real time via the communication network.

In the future development of power systems, the number of distributed energy sources will increase day by day, and the real-time continuous information interaction of a large number of distributed units will pose a severe challenge to the limited bandwidth resources of the communication network. The problem of excessive communication pressure will bring phenomena such as information delay and packet loss, and can further lead to the failure of control tasks, posing a threat to the stable and safe operation of the microgrid

However, there is still no effective solution to these problems

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