Dandelion type distribution network system based on energy router and control method

By using a dandelion-shaped distribution network system based on energy routers, flexible network controllers and power electronic devices are used to achieve flexible interconnection and load balancing of radial distribution networks, solve the problems of circulating current and inrush current during loop closing, and improve the reliability and economy of the distribution network.

CN117220291BActive Publication Date: 2026-06-19STATE GRID FUJIAN ELECTRIC POWER CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
STATE GRID FUJIAN ELECTRIC POWER CO LTD
Filing Date
2023-08-31
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing radial distribution networks are prone to circulating currents and inrush currents when looping, and the reliability of power supply is reduced when switching to power supply without interruption. Traditional protection configurations are complex and require a large amount of operation and maintenance work.

Method used

A dandelion-shaped distribution network system based on energy routers is adopted. Through flexible network controllers and power electronic devices, bidirectional power flow is realized at AC and DC ports, forming a network structure similar to that of a dandelion. DC microgrids are used for emergency power supply and load balancing.

Benefits of technology

It enables uninterrupted power supply during AC line maintenance, improving the reliability and economy of the distribution network, reducing mechanical wear, and enhancing system response speed and control accuracy.

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Abstract

This invention proposes a dandelion-type distribution network system and control method based on energy routers. The distribution network system includes at least two energy routers and a flexible networking controller. The energy routers include AC ports and DC ports. The AC ports are connected between two AC buses of the same voltage level. The DC ports are connected to the common bus of the DC microgrid through a DC switch. The flexible networking controller is responsible for the internal control of the energy routers and communicates with the flexible networking controllers of other grid units to form a ring communication structure. It also communicates with the remote distribution network master station and receives remote control. The energy routers are interconnected with the two AC buses and lead out DC ports to form a grid unit. Each grid unit is connected by a DC port and together constitutes a DC microgrid that can integrate DC-type source-load storage devices. This invention realizes the power flow mutual assistance and flexible controllability of the new distribution network, while improving the security and reliability of the distribution network.
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