Frequency layering coordination control method suitable for isolated microgrid including diesel generator and battery storage

Abstract

The invention discloses a frequency layering coordination control method suitable for a isolating microgrid including diesel generator and battery storage. A frequency control system comprises a central decision layer and a local decision layer, primary frequency modulation and secondary frequency modulation of the system can be realized, wherein a diesel generator in the local decision layer is taken as a main regulating unit for the primary frequency modulation; a PI (proportional-integral) controller in a dead zone of the central decision layer and distributed battery storage in the local decision layer form an auxiliary primary frequency modulation unit; and the two layers coordinate with each other to modulate the frequency once. When the frequency is stable at upper limit or lower limit of the primary frequency modulation dead zone, the secondary frequency modulation is started. The secondary frequency modulation is finished by coordination of the secondary frequency modulation module in the central decision layer and a microsource in the local decision layer; the spinning reserve or pitch peak reserve of the diesel generator is regulated by resetting active power reference value of the distributed battery storage, regulating power of the new energy, starting / stopping the diesel generator and controlling the load and so on, so as to lead the frequency of the system to recover the rated frequency. With the adoption of the frequency layering coordination control method, response characteristics of different microsources can be coordinated and utilized completely to modulate the frequency of the system, thereby simple, quick and stable control of the isolated microgrid is realized. The method has the advantages of strong robustness and flexibility, and with the adoption of the method, requirements of long-term safe and stable operation of the isolated microgrid system can be met.

Description

technical field [0001] The invention belongs to the technical field of power system microgrids, in particular to a frequency layered coordination control method suitable for isolated microgrids containing diesel fuel storage. Background technique [0002] The electrical "isolation" operation of distributed power in the form of a microgrid is an operation mode of the grid-connected microgrid when it is disturbed, and it is also a power supply method suitable for remote mountainous areas and islands. The isolated microgrid is a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, related loads and monitoring and protection devices. It is an autonomous system capable of self-control, protection and management. [0003] The control of isolated microgrid at home and abroad is mainly divided into two modes: peer-to-peer control mode and master-slave control mode. The peer-to-peer control mode simu...

AI Technical Summary

Problems solved by technology

Although decentralized control reduces the functional requirements for the microgrid central controller MGCC, the overall coordinated control function is greatly reduced, making it difficult to optimize the overall performance of the microgrid.

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