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Flexible direct-current grid fault current limiter with quick recovery capacity

A flexible DC and power grid fault technology, applied in the direction of emergency protection circuit devices, electrical components, circuit devices for limiting overcurrent/overvoltage, and can solve problems such as difficult DC circuit breaker coordination

Inactive Publication Date: 2017-01-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the DC current limiter technology is still in the initial stage of research. It is difficult for the existing DC current limiter to meet the operating speed requirements of the flexible DC grid, and it is also difficult to achieve effective cooperation with the DC circuit breaker. Therefore, it is necessary to design a flexible DC current limiter. net DC current limiter

Method used

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  • Flexible direct-current grid fault current limiter with quick recovery capacity
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  • Flexible direct-current grid fault current limiter with quick recovery capacity

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Embodiment Construction

[0018] After a DC fault occurs in the flexible DC grid, the fault current rises sharply. It is required that the DC current limiter can respond quickly within 1 millisecond (or even faster), reflect the characteristics of large inductance, and play the role of current limiting. After the main circuit breaker of the DC circuit breaker starts to operate, the current limiter is required to quickly return to the low inductance characteristic, so as to avoid adverse effects on the operating speed of the DC circuit breaker, and will not generate transient overvoltage. For this reason, the present invention designs and proposes a DC current limiter suitable for flexible DC power grids.

[0019] The specific topology is as figure 1 Shown:

[0020] Series diode group D 1 ~D 4 A single-phase rectifier bridge is formed as four bridge arms respectively. where the series diode group D 1 anode with D 2 Cathode connected, D 1 The cathode with D 3 Cathode connected; D 4 anode with D...

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Abstract

The invention relates to a flexible direct-current grid fault current limiter with quick recovery capacity. The flexible direct-current grid fault current limiter with the quick recovery capacity is characterized in that the current limiter comprises four diode sets D1-D4 connected in series, a square iron core, a winding L1 and a winding L2, wherein the four diode sets D1-D4 connected in series are used as four bridge arms to form a single-phase rectifier bridge; the winding L1 is wound around one side of the square iron core, connected with a direct-current bias power supply Udc1 in series, and then connected between a common cathode point P of the diode sets D1 and D3 and a common anode point N of the diode sets D2 and D4; the other side of the square iron core is wound with the winding L2; the winding L2 is connected to the two ends of a direct current power supply Udc2 after being connected with a direct-current switch S in series; the winding direction of the windings L1 and L2 needs to ensure that generated magnetic field directions are the same. The flexible direct-current grid fault current limiter with the quick recovery capacity can realize quick response after faults occur and cooperate with a direct current breaker efficiently, and can also realize quick recovery after faults are removed.

Description

technical field [0001] The invention relates to the field of power system protection and control, in particular to a DC short-circuit fault current limiter suitable for a flexible DC grid. Background technique [0002] Compared with the traditional AC power system, the flexible DC power grid based on the MMC converter is conducive to increasing the transmission capacity, reducing the transmission corridor, and is more conducive to the large-scale centralized access of new energy generation such as wind power and photovoltaics; compared with conventional DC transmission Compared with the system, the flexible DC grid has outstanding advantages in terms of reliable commutation, passive network power supply, and power quality. Therefore, the flexible DC power grid has become one of the main trends in the future power system development, and has also become a hot spot of research and application at home and abroad in recent years. [0003] However, unlike the traditional AC powe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02
CPCH02H9/021
Inventor 李斌何佳伟李晔
Owner TIANJIN UNIV
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