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DC reactor shielding circuit and control method thereof

A technology of DC reactance and shielding circuit, which is applied in circuit devices, emergency protection circuit devices, electrical components, etc., can solve the problems of poor economy, high requirements on DC reactance withstand voltage level, and large energy dissipation of arresters, saving investment, The effect of improving reliability and saving device cost

Inactive Publication Date: 2019-03-01
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 in the prior art that the lightning arrester dissipates large energy and is poor in economy, and that the disconnection process requires high DC reactance withstand voltage levels, the present invention provides a DC reactance shielding circuit and its control method. The DC reactance shielding circuit includes energy consumption Modules, thyristor branches and diode branches

Method used

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  • DC reactor shielding circuit and control method thereof
  • DC reactor shielding circuit and control method thereof

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Embodiment 1

[0041] Embodiment 1 of the present invention provides a DC reactance shielding circuit, which specifically includes an energy consumption module, a thyristor branch and a diode branch. The functions of each branch are as follows:

[0042] The energy consumption module is used to shield the DC reactance after the DC line fails, and at the same time absorb the energy in the DC circuit reactance, reduce the dissipated energy flowing into the arrester, prolong the service life of the arrester, and improve the reliability of the DC circuit breaker;

[0043] Among them, the thyristor branch is used to control the DC reactance shielding circuit to be connected to the DC line after the circuit breaker is disconnected, and to shield the DC reactance;

[0044] The diode branch is used to input the energy consumption module after the thyristor is turned on to form a flow branch and shield the DC reactance.

[0045] The schematic structural diagram of the DC reactance shielding circuit pr...

Embodiment 2

[0052] Embodiment 2 of the present invention provides a control method for a DC reactance shielding circuit, and the specific process is as follows:

[0053] When the DC line where the DC reactance shielding circuit is located is in normal operation, all the thyristors and IGBTs in the DC reactance shielding circuit are turned off, and the steady-state current flows through the DC reactance. 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

[0055] The control method of the DC reactance shielding circuit provided by Embodiment 3 of the present invention, the specific process is as follows:

[0056] Before the DC circuit breaker where the DC reactance shielding circuit is located is disconnected, all thyristors and IGBTs in the DC reactance shielding circuit are turned off, and the fault current flows through the DC reactance. The schematic diagram of the flow path of the DC line fault current before the circuit breaker is disconnected is as follows: image 3 shown.

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Abstract

The invention provides a DC reactor shielding circuit and a control method thereof. The DC reactor shielding circuit comprises an energy consumption module, a thyristor branch and a diode branch. Withthe adoption of a half-control device and a full-control device, the DC reactor shielding circuit is simple in logic and is economic and reliable. The DC shielding reactor employs a thyristor and a diode to form a rectification bridge and has bidirectional current-through capability, DC reactance can be effectively shielded, the device is saved, and the cost is reduced; the DC reactance energy can be effectively consumed, overvoltage is prevented, the consumed energy of a lightning arrester is reduced, the service lifetime of the lightning arrester is prolonged, the reliability of a DC circuit breaker is improved, a resistor and a corresponding cooling device are ensured to be fully utilized, and the energy consumption effect is improved. According to the control method of the DC reactance shielding circuit, provided by the invention, and control of the DC shielding reactor is achieved under two conditions of normal running of a DC circuit where the DC shielding reactor is located orbefore disconnection of the DC circuit breaker where the DC shielding reactor is located and after disconnection of the DC circuit breaker where the DC shielding reactor is located.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a DC reactance shielding circuit 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 circui...

Claims

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Application Information

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IPC IPC(8): H02H3/05
CPCH02H3/05
Inventor 许建中赵西贝宋冰倩赵成勇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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