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Resistance-inductance hybrid fault current limier and control method thereof

A fault current limiter and control method technology, applied in the field of power electronics, can solve the problems of high 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 Investment, effect of small loss resistor

Inactive Publication Date: 2019-03-22
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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, the present invention provides a resistance-inductive hybrid fault current limiter and its Control method, resistive-inductive hybrid fault current limiter includes on-state low-loss branch, current transfer branch and current-limiting branch

Method used

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  • Resistance-inductance hybrid fault current limier and control method thereof
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  • Resistance-inductance hybrid fault current limier and control method thereof

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Embodiment 1

[0042] Embodiment 1 of the present invention provides a resistive-inductive 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:

[0043] 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;

[0044] 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;

[0045] 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.

[0046] The structure diagram of the resistive-inductive hybrid...

Embodiment 2

[0052] Embodiment 2 of the present invention provides a control method for a resistive-inductive hybrid fault current limiter, and the specific process is as follows:

[0053] When the DC line where the hybrid current limiter based on the clamp sub-module 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

[0055] The control method of the resistive-inductive hybrid fault current limiter provided in Embodiment 3 of the present invention, the specific process is as follows:

[0056] Before detecting a fault on the DC line where the resistive-inductive 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 resistance-inductance hybrid fault current limiter and a control method thereof. The hybrid current limiter comprises an on-state low loss branch, a current transfer branch and a current limiting branch, adopts semi-controlled devices and is simple in logic, economic and reliable. According to the current limiter, a current limiting reactor and a current limiting resistorare inputted by utilizing the coordination of thyristors and a commutation capacitor, the steady-state loss is low, a bidirectional current limiting ability is possessed, and short-circuit current ofa DC power grid can be effective suppressed; meanwhile, the locking time of sub-module IGBTs is greatly delayed, and enough time is obtained for the operation of the remaining protective devices; andthe dissipated energy of a lightning arrester can be reduced, so that the hybrid current limiter has the advantages of economy and reliability. The control method provided by the invention of the resistance-inductance hybrid fault current limiter provided realizes control for the resistance-inductance hybrid fault current limiter when a DC line where the current limiter is located operates normally or before a fault of the DC line where the current limiter is located is detected and after the fault of the DC line where the resistance-inductance hybrid fault current limiter is located is detected.

Description

[0001] The invention relates to the technical field of power electronics, in particular to a resistance-inductance 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. my country's upcoming Zhangbei DC power grid 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 necessary to use a DC circu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02
CPCH02H9/02
Inventor 许建中赵西贝宋冰倩赵成勇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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