An island detection and stability control method for four-terminal DC distribution network

A stable control method and technology of DC distribution network, applied in the direction of AC network circuit, power transmission AC network, AC network load balancing, etc., can solve problems such as severe voltage fluctuations
CN109217337BActive Publication Date: 2020-09-22SOUTH CHINA UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTH CHINA UNIV OF TECH
Publication Date
2020-09-22

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Abstract

The invention discloses an islanding detection and stability control method for a four-terminal DC distribution network, which includes the following steps: 1) main criterion for islanding detection based on switch state combination; 2) auxiliary criterion for islanding detection based on no-flow-pressure difference combination. According to; 3) Island stability control based on collaborative control of DC transformer and energy storage. The present invention combines the main criterion based on the switch state combination and the auxiliary criterion based on the no-current-pressure difference composite to detect the islanding of the four-terminal DC distribution network and designs it as an islanding detector; when the islanding detector detects After reaching the island, the control mode of T3's DC transformer and energy storage is switched to achieve stable control of the island, thereby maintaining the stable operation of the entire island power grid.
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Description

technical field

[0001] The invention relates to the technical field of DC distribution network, in particular to an island detection and stability control method for a four-terminal DC distribution network. Background technique

[0002] Compared with the AC distribution network, the DC power distribution system has the ability to smoothly connect various distributed power sources on the spot, realize the closed-loop operation of multiple power sources, flexibly carry out bidirectional flow and control of active power, improve the power quality of the user side, A series of advantages such as isolating system failures. Therefore, the research of DC power distribution system has important social significance and broad application prospects.

[0003] At present, the research on DC distribution network is still in its infancy, mainly focusing on the topology and control methods of DC distribution network, and there is little research on islanding detection and stability control...

Claims

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