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

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.