A multi-terminal flexible DC distribution network protection method based on current-limiting inductor voltage

A technology of DC distribution network and current-limiting inductance, which is applied in the direction of emergency protection circuit devices, electrical components, emergency protection detection, etc., and can solve problems such as the inability to meet the protection quickness and selectivity requirements of multi-terminal flexible DC distribution network. To achieve the effect of satisfying the selectivity

Active Publication Date: 2022-05-13
TAIYUAN UNIV OF TECH
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  • Description
  • Claims
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Problems solved by technology

[0005] In order to solve the deficiency that the existing technology cannot meet the protection quickness and selectivity requirements of the multi-terminal flexible DC distribution network, the present invention proposes a multi-terminal flexible DC distribution network protection method based on the current-limiting inductance voltage

Method used

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  • A multi-terminal flexible DC distribution network protection method based on current-limiting inductor voltage
  • A multi-terminal flexible DC distribution network protection method based on current-limiting inductor voltage
  • A multi-terminal flexible DC distribution network protection method based on current-limiting inductor voltage

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Embodiment Construction

[0046] The present invention includes a multi-terminal annular DC power distribution system. The multi-terminal annular DC power distribution system includes a converter, a DC circuit breaker and a DC line. The converter adopts a two-level voltage source converter (voltage source converter, VSC), Such as figure 1 shown.

[0047] figure 1 Middle: S1~S4 represent the AC system; VSC1~VSC4 are converters; Bus1~Bus4 are DC buses; DC transmission lines; F1-F4 are fault points, among which: F1 is on Line1, F2 is on Line2, F3 is on Line4, and F4 is on Bus2 DC bus. The DC circuit breaker is installed at the outlet of the DC bus bar, and the current-limiting inductor is installed between the DC circuit breaker and the DC transmission line. Each transmission line includes two lines of positive and negative poles.

[0048] against figure 1 The four-terminal flexible DC power distribution system shown adopts the master-slave control mode, and the converter VSC1 adopts constant DC volta...

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Abstract

A multi-terminal flexible DC distribution network protection method based on current-limiting inductor voltage, including fault startup, fault detection, fault identification, and fault pole selection; the fault startup uses du / dt and di / dt as criteria; fault detection It uses low-voltage and over-current protection to further detect whether the line is faulty; fault identification uses the current-limiting inductance voltage at both ends of the DC line to reliably identify internal and external faults; fault selection uses the current-limiting inductance at both ends of the DC line Voltage to determine whether the system has a positive, negative or bipolar fault; when the corresponding fault is detected, a trip signal is sent, and the corresponding DC circuit breaker operates to remove the fault. The invention solves the problem that the protection of the traditional direct current distribution network is not fast enough. The invention performs fault identification through the voltage at both ends of the current-limiting inductance.

Description

technical field [0001] The invention relates to a DC protection method, in particular to a voltage source converter (VSC)-based multi-terminal flexible DC distribution network protection method. Background technique [0002] In recent years, with the development of power electronics technology and DC energy storage devices, great changes have taken place in the power supply and load in the power system, and the proportion of distributed power supply in the power supply is getting higher and higher. Various DC The load is connected to the grid through the converter. When using the traditional AC distribution network to realize the consumption of distributed power sources and DC loads, it needs to be connected to the AC distribution network through multi-level converter stations, and the investment of a large number of power electronic equipment increases the investment cost. Compared with the AC power distribution system, the DC power distribution network has the advantages ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02H7/28
CPCH02H7/268H02H7/28H02H1/0007
Inventor 秦文萍上官鑫任春光夏福良刘翼肇左鹏飞常潇王金浩王磊孟润泉
Owner TAIYUAN UNIV OF TECH
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