Capacitive commutation hybrid fault current limiter and control method thereof

A fault current limiter and hybrid technology, applied in the field of power electronics, can solve the problems of large loss of solid-state DC current limiter, high manufacturing cost of superconducting current limiter, large equipment volume, etc., and achieve good current limiting effect and save money. Investment, effect of low-loss resistors

Inactive Publication Date: 2019-05-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problems of large loss and poor economy of the solid-state DC current limiter in the above-mentioned prior art, as well as the high manufacturing cost and large equipment volume of the superconducting current limiter

Method used

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  • Capacitive commutation hybrid fault current limiter and control method thereof
  • Capacitive commutation hybrid fault current limiter and control method thereof
  • Capacitive commutation hybrid fault current limiter and control method thereof

Examples

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Embodiment 1

[0044] Embodiment 1 of the present invention provides a capacitor-commutated hybrid fault current limiter, which specifically includes an on-state low-loss branch, a current transfer path, and a current-limiting branch. The functions of each branch are as follows:

[0045] The on-state low-loss branch is used to realize the conduction of the steady-state current of the DC line when the DC line is running normally, and transfer the fault current to the current-limiting branch after detecting a fault in the DC line;

[0046] Among them, the current transfer branch is used to carry the fault current transferred by the flow-through branch, and force the current-limiting element in the current-limiting branch to connect to the DC line;

[0047] Among them, the current-limiting branch is used to increase the system damping and reduce the rising speed of the fault current after being connected in series with the DC line.

[0048] The structure diagram of the capacitive commutation hy...

Embodiment 2

[0054] Embodiment 2 of the present invention provides a control method for a capacitor-commutated hybrid fault current limiter, and the specific process is as follows:

[0055] When the DC line where the capacitor commutation hybrid fault current limiter 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, and the IGBT in the on-state low loss branch 1 and IGBT 2 conduction, the steady-state current flows through the flow-through branch, and the schematic diagram of the steady-state current flow path when the DC line is in normal operation is shown in figure 2 shown.

Embodiment 3

[0057] The control method of the capacitive commutation hybrid fault current limiter provided by Embodiment 3 of the present invention, the specific process is as follows:

[0058] Before detecting a fault on the DC line where the capacitive commutation hybrid fault current limiter is located, the IGBT in the current branch 1 and IGBT 2 is turned on, the fault current flows through the on-state low-loss 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 capacitive commutation hybrid fault current limiter and a control method thereof. The capacitive commutation hybrid fault current limiter comprises an on-state low-loss branch, a current transfer branch and a current limiting branch. A semi-controlled device is simple in logic and economical and reliable. The hybrid fault current limiter is low in loss of the steady state,has a bidirectional current limiting capability and can effectively inhibit the short-circuit current of a DC grid; the locking time of a sub module IGBT is delayed to obtain enough time for motion of other protection devices; it is ensured that a current limiting resistor and a corresponding heat-dissipating device can be fully utilized to improve the current limiting effect. The control methodof the capacitive commutation hybrid fault current limiter comprises two conditions of the normal operation of the DC line where the current limiter is located or before detection of the generation offaults of the DC line where the current limiter is located or after detection of the generation of faults of the DC line where the capacitive commutation hybrid fault current limiter is located to achieve control for a resistance-inductive capacitor commutation hybrid current limiter.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a capacitive commutation hybrid fault current limiter and a control method thereof. 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 side, it is...

Claims

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Application Information

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IPC IPC(8): H02H9/02
Inventor 赵成勇卢宇宋冰倩许建中唐崇学邱树明唐浩
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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