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Multi-port current-limiting circuit breaker suitable for direct-current power grid

A DC power grid and multi-port technology, applied in the direction of emergency protection circuit devices, circuit devices, emergency protection circuit devices, etc. for limiting overcurrent/overvoltage, can solve the problems of large equipment volume, high manufacturing cost of circuit breakers, and power consumption To solve problems such as large energy demand, achieve the effect of simple logic, saving investment cost, and reducing cut-off capacity

Pending Publication Date: 2020-04-10
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above-mentioned problems of high energy consumption of lightning arresters and high manufacturing cost of circuit breakers and large equipment volume in the prior art, the present invention provides a multi-port current-limiting circuit breaker and its control method suitable for DC power grids. The flow circuit breaker includes a flow branch, a current limiting branch, a capacitor precharging branch, a main circuit breaker and an energy transfer branch

Method used

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  • Multi-port current-limiting circuit breaker suitable for direct-current power grid
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  • Multi-port current-limiting circuit breaker suitable for direct-current power grid

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Embodiment 1

[0057] Embodiment 1 of the present invention provides a multi-port current-limiting circuit breaker suitable for DC power grids, which specifically includes a current-through branch, a current-limiting branch, a capacitor pre-charging branch, a main circuit breaker, and an energy transfer branch. The road function is as follows:

[0058] The flow-through branch is used to realize the conduction of the steady-state current of the DC line when the DC line is in normal operation, and transfer the fault current to the main circuit breaker branch after detecting a fault in the DC line;

[0059] Among them, the main circuit breaker is used to carry the fault current transferred by the flow branch, and cut off the fault current through the arrester;

[0060] The current limiting branch is used to suppress the rise of the fault current at the initial stage of the fault;

[0061] The capacitor pre-charging branch is used to charge the capacitor of the current-limiting branch by using ...

Embodiment 2

[0075] Embodiment 2 of the present invention provides a control method for a multi-port current-limiting circuit breaker suitable for a DC power grid, and the specific process is as follows:

[0076] When the DC line where the multi-port current-limiting circuit breaker is located is in normal operation, the thyristors in the current transfer branch are all turned off, the current-limiting branch is out of operation, D1 and D2 in the current-passing branch are turned on, and the steady-state current flows through The current flow branch, the schematic diagram of the steady-state current flow path when the DC line is in normal operation is as follows: figure 2 shown.

Embodiment 3

[0078] Embodiment 3 of the present invention provides a control method for a multi-port current-limiting circuit breaker applicable to a DC power grid, and the specific process is as follows:

[0079] Before detecting a fault in the DC line where the multi-port current-limiting circuit breaker is located, the IGBT in the current branch 1 and IGBT 2 conduction, the fault current flows through the flow branch, and the schematic diagram of the flow path of the DC line fault current before the fault is detected is shown in image 3 shown.

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Abstract

The invention provides a multi-port current-limiting circuit breaker topology suitable for a direct-current power grid and a control method of the multi-port current-limiting circuit breaker topology.The topological structure is composed of a through-current branch, a current-limiting branch, a capacitor pre-charging branch, a main circuit breaker and an energy transfer branch. A single main circuit breaker is adopted to protect a plurality of direct-current lines, a thyristor with high through-current capability is used as a control unit between the main circuit breaker and the direct-current lines, a capacitor pre-charging branch fully utilizes a direct-current system to charge a capacitor of a current-limiting branch, and an energy transfer branch is used for shielding current-limitingreactance. The invention provides a control method of a multi-port direct-current circuit breaker. The multi-port direct-current circuit breaker is controlled under the three conditions of normal operation of a line where the multi-port direct-current circuit breaker is located, circuit breaking after a direct-current fault of one line is detected and energy consumption after the current of a fault line is reduced to zero.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a multi-port current-limiting circuit breaker and a control method suitable for DC power grids. Background technique [0002] High-voltage and large-capacity DC grid technology is an important link in the future construction of smart grids and global energy Internet. Flexible DC transmission technology based on modular multilevel converter (MMC) facilitates the construction of DC power grids, thus becoming a new expectation in the power industry. The Zhangbei DC power grid to be built in my country adopts the half bridge sub module plus overhead line scheme, which is the world's first DC power grid engineering practice. The use of overhead lines has obvious technical and economic advantages, but the ensuing problem is the high probability of faults on the DC side. Combined with the fact that the half-bridge sub-module does not have the ability to clear faults on the DC...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02H9/02
CPCH02H7/268H02H9/02
Inventor 许建中武董一宋冰倩赵成勇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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