Microgrid operation control method

Abstract

The invention discloses a microgrid operation control method. The method comprises the following steps: a microgrid comprises small hydro, wind, light, storage and other forms of distributed power supplies, when a main grid system fails, a microgrid control system disconnects a grid-connected switch, isolates a fault point and switches to an island mode for operation; in the island mode, a hydroelectric generating set is used as a main frequency modulation and voltage regulation power supply in the microgrid to support the frequency and voltage of the microgrid, and each distributed power supply quickly participates in frequency primary regulation to cooperatively support the frequency and voltage stability of the microgrid; a microgrid energy management system recovers frequency and voltage to a normal range through load hierarchical control and energy storage accurate output adjustment. According to the invention, the multi-source coordination control problem of the microgrid systemcontaining the small hydro in the island mode is solved, the frequency modulation and voltage regulation capabilities of the traditional hydropower unit are fully excavated, and the frequency and voltage stability of the microgrid is ensured. The method is especially suitable for power supply scenes of remote areas with rich water and electricity resources, and the load power supply reliability level can be remarkably improved.

Description

technical field [0001] The present application relates to the technical field of micro-grid operation control, in particular to a micro-grid operation control method. Background technique [0002] With the increasing proportion of distributed power generation, microgrid has received extensive attention. Microgrid refers to a small power generation system composed of distributed power sources, energy storage equipment, energy conversion devices, related loads and monitoring and protection devices, enabling an autonomous system that can realize self-control, protection and management, in which energy storage equipment It includes a plurality of energy storage units, and each energy storage unit includes an energy storage element and a PCS (that is, an energy storage DC / DC converter). [0003] The microgrid has two operating modes: grid-connected and islanded. The island mode means that the microgrid does not operate in parallel with the large power grid. Provide power; if th...

AI Technical Summary

Problems solved by technology

However, master-slave control needs to select one or more micro power sources as the main control unit, and provide voltage and frequency support to the micro grid system when the micro grid changes from grid-connected mode to island mode. The problem of strong dependence and easy failure of mode switching; in the peer-to-peer control method, all micro power sources are in the same position and do not depend on a certain main control unit and communication lines. This method is conducive to the plug and play of micro power sources and the The expansion of the power grid system does not take into account the restoration of frequency and voltage, which is differential frequency regulation

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