Microgrid energy regulation method and system

Abstract

The invention relates to a method and system for adjusting micro-grid energy. The method includes: A. when the micro-grid is switched from the grid-connected mode to the island mode, obtain the power imbalance; B. judge whether the energy storage reserve is greater than the power imbalance; if so, adjust the output power of the micro-source, if the adjusted power If the imbalance amount is less than the set normal deviation amount, and the energy storage backup amount is greater than or equal to the set ratio, the microgrid enters the island operation stage, otherwise, perform step C; C, execute the preset first-level load control strategy; D, if the microgrid If the power imbalance of the grid is less than the set normal deviation, and the energy storage reserve is greater than or equal to the set ratio, the microgrid enters the island operation stage, otherwise, perform step E; E, execute the preset secondary load control strategy until The microgrid power imbalance is smaller than the set normal deviation. The invention can eliminate the problem of power imbalance in the transitional stage of switching from the grid-connected mode of the microgrid.

Description

technical field [0001] The invention relates to the field of power systems, in particular to an energy regulation method and system for a microgrid when a distribution network is out of power. Background technique [0002] In the field of power systems, with the increasing attention and in-depth research on Micro-Grid (MG for short, also known as micro-grid), the operation of micro-grid under two modes of grid-connected and off-grid (island) Stability issues and smooth transition issues when switching between the two have also attracted much attention. [0003] A microgrid is a single controllable distribution network module that integrates micro power sources (referred to as micro sources), energy storage devices, loads, and control and protection systems. It can be understood that the microgrid is connected to the distribution network as a controllable module. The microgrid can improve the reliability of power supply on the user side, realize large-scale high-penetration...

AI Technical Summary

Problems solved by technology

[0005] As an important part of the smart grid, the commercial building microgrid is a relatively common microgrid. At present, there are still some problems in the control of the commercial building microgrid, especially when the power supply of the distribution network suddenly stops, the commercial building microgrid The grid will switch from the grid-connected mode to the island mode instantaneously, and the frequency of the microgrid will change at the moment of mode switching, and the change of frequency will affect the active power output of the microsource; The frequency exceeds the range of the rated frequency), which seriously affects the power consumption comfort of microgrid users

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