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Voltage-equalizing circuit for high-voltage DC power transmission hybrid converter

A technology of high-voltage direct current transmission and voltage equalization circuit, which is applied in the direction of output power conversion devices and electrical components, and can solve problems such as easy damage and overvoltage

Inactive Publication Date: 2020-07-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The novel high-voltage direct current transmission hybrid converter is provided with a shut-off pipe-valve string, and the shut-off pipes in the shut-off pipe-valve string are in normal operation of the novel high-voltage direct current transmission hybrid converter and are resistant to commutation. When a failure occurs, it will face the problem of overvoltage and easy damage

Method used

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  • Voltage-equalizing circuit for high-voltage DC power transmission hybrid converter
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  • Voltage-equalizing circuit for high-voltage DC power transmission hybrid converter

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Embodiment Construction

[0050] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0051] figure 1 A topological structure diagram of a novel HVDC hybrid converter adopting the voltage equalizing circuit of the present invention is shown. Depend on figure 1 It can be seen that the HVDC hybrid converter has six completely identical bridge arms: Ap, An, Bp, Bn, Cp, and Cn; points P and N are DC voltage conne...

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Abstract

The invention discloses a voltage-equalizing circuit for a high-voltage DC power transmission hybrid converter, and the circuit comprises a turn-off tube and a voltage-stabilizing circuit, and the turn-off tube is connected with the voltage-stabilizing circuit. According to the invention, the voltage-equalizing circuit adopts a simple circuit topological structure; the voltage equalization designof the turn-off tube of the bridge arm of the novel high-voltage DC power transmission hybrid converter is realized, so the voltage overvoltage can be clamped when the novel high-voltage DC power transmission hybrid converter operates normally and resists commutation failure faults, and the turn-off tube is protected from being damaged by the overvoltage.

Description

technical field [0001] The invention belongs to the field of direct current transmission, in particular to a voltage equalizing circuit for a hybrid converter of high voltage direct current transmission. Background technique [0002] The existing high-voltage direct current transmission technology (HVDC, High-Voltage Direct Current) is currently widely used due to its advantages of large transmission capacity, low loss, and high reliability. The commutation failure is one of the most likely faults in DC transmission systems. In the converter used in the direct current transmission system, the valve that exits the conduction fails to recover the blocking ability within a period of time when the reverse voltage is applied, or the commutation process is not completed during the reverse voltage, then the valve voltage changes When it is in the forward direction, the commutated valve will commutate to the valve that was originally scheduled to withdraw from conduction. This situ...

Claims

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Application Information

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IPC IPC(8): H02M1/32H02M1/34
CPCH02M1/32H02M1/34
Inventor 余占清许超群曾嵘赵彪陈政宇
Owner TSINGHUA UNIV