Regulation and control method and system for switching grid-connected operation mode to island operation mode of microgrid

Abstract

The invention discloses a regulation and control method and system for a switching grid-connected operation mode to an island operation mode of a microgrid. The method comprises the following steps: carrying out inputting and quitting on devices in the microgrid based on the importance degree according to the practical application demands, and carrying out regulation and control priority ranking; during grid-connecting, collecting operating data information and trend distribution information of the microgrid in real time; precaculating the value of power balance gap happened after losing main network electric power once the microgrid is switched to the island operation mode; deducing and calculating the power regulation and control action of a distribution power source, load equipment and an energy storage device which can be switched or adjusted instantly according to the priority ranking of the devices, so that when island occurs, a new power balance can be instantly established, island regulation and control pre-plans for different devices can be generated, and the pre-plans are transmitted to control terminals of the corresponding devices in advance; and when the island is monitored, the island change information is transmitted to the control terminals, so that the controllable device is triggered to execute corresponding island regulation and control pre-plans automatically. Through the reasonable regulation and control, the electric energy is allowed to be utilized reasonably.

Description

technical field [0001] The invention relates to the technical field of power grid control, in particular to a control method and system for switching between a grid-connected operation mode of a micro-grid and an island operation mode. Background technique [0002] When the micro-grid is connected to the large power grid (distribution network), it relies on the stability of the large power grid and the huge power adjustment capability, so that the equipment in the micro-grid can receive continuous and stable power supply. When the large grid fails or the power outage causes the micro grid to separate from the main grid to form an island, the distributed power supply and energy storage equipment of the micro grid may not be enough to support the power consumption of all loads, resulting in insufficient power supply, operating frequency deviation from the standard frequency, and voltage drop. affect the stable operation of the load. [0003] At this time, it is necessary to q...

AI Technical Summary

Problems solved by technology

When the large grid fails or the power outage causes the micro grid to separate from the main grid to form an island, the distributed power supply and energy storage equipment of the micro grid may not be enough to support the power consumption of all loads, resulting in insufficient power supply, operating frequency deviation from the standard frequency, and voltage drop. Affects the stable operation of the load

Images