Integrated management system for connecting micro grid to distribution network site

Abstract

Disclosed is an integrated management system for connecting a micro grid to a distribution network site. The system is located at the connection point of a distribution network and a micro grid. At the physical level, the system comprises a solid-state switch, a transmission line, a transformer, and a distribution network bus, wherein the transformer is connected to the distribution network bus, and the transmission line is directly connected to a micro grid bus. In the aspect of information transmission, PCC local state measurement information, PCC logic judgment information and coordinated control information are respectively connected with a distribution network energy management system and a micro grid energy management system through optical cables. The system is divided into a physical system layer, a sensing layer, a data-information conversion layer, a communication network layer, a policy control layer, and a scheduling application layer through hierarchical design. The integrated management system for connecting a micro grid to a distribution network site of the invention is disclosed in order to solve the problem concerning power quality, synchronized cut-in, island detection and cut-in protection at a point of common coupling (PCC). Power quality information can be monitored and power quality can be adjusted in real time. Through PCC protection, it is ensured that a micro grid is in a safe and stable parallel operation mode.

Description

technical field [0001] The invention relates to a comprehensive management system for integrating a micro-grid into a distribution network point, belonging to the field of micro-grid comprehensive management. Background technique [0002] Microgrid is an advanced structural form of efficient utilization of new energy. It can organize a variety of distributed energy, energy storage equipment, and loads. It has two operating modes: grid-connected operation and off-grid operation. Under normal circumstances, the microgrid and the distribution network are connected through the point of public coupling (PCC) and are in grid-connected operation mode. Once the load in the grid fluctuates greatly or fails, the solid-state switch at the point of public coupling will be disconnected, and the microgrid will be disconnected. The grid is in off-grid operation mode. Two factors are critical in microgrid mode switching. First of all, in the grid-connected operation mode, the distribution...

AI Technical Summary

Problems solved by technology

[0007] The present invention provides a comprehensive management system for integrating microgrids into distribution network points, aiming to solve the comprehensive problems of power quality at public coupling points, synchronous grid connection, island detection and grid connection protection

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