Method and system for adjusting energy of microgrid

Abstract

The invention relates to a method and system for adjusting the energy of a microgrid. The method includes obtaining power imbalance when the microgrid is switched to an island model from a grid-connected mode; determining whether stored energy available is greater than the power imbalance, adjusting the micro source output power if yes, and the microgrid entering into an island operation phase if the adjusted power imbalance is smaller than a set normal deviation value and the stored energy available is greater than a set proportion; otherwise, executing a preset first-level load control strategy; the microgrid entering into an island operation phase if the power imbalance is smaller than the set normal deviation value and the stored energy available is greater than a set proportion; otherwise, executing a preset second-level load control strategy until the power imbalance is smaller than the set normal deviation value. Power imbalance during a transition phase when the microgrid is switched from a grid-connected mode can be eliminated.

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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