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An Adaptive Capacitor Voltage Limiting HVDC Circuit Breaker

A high-voltage DC and circuit breaker technology, applied in power transmission AC network, emergency protection circuit devices, electrical components, etc., can solve the problems of complex control process, on-state loss of large power electronic devices, and high maintenance costs

Inactive Publication Date: 2019-08-30
XINJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this solution also has a large on-state loss of power electronic devices, making the maintenance cost still high, and the control process is still relatively complicated

Method used

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  • An Adaptive Capacitor Voltage Limiting HVDC Circuit Breaker
  • An Adaptive Capacitor Voltage Limiting HVDC Circuit Breaker
  • An Adaptive Capacitor Voltage Limiting HVDC Circuit Breaker

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Embodiment Construction

[0029] The present invention proposes a design scheme of an adaptive capacitor voltage-limiting high-voltage DC circuit breaker, the specific content of which is as follows:

[0030] In general, the voltage across the capacitor cannot change suddenly. However, research has found that when two capacitors with different initial voltage values ​​are connected in parallel, the total charge at the connection point of the two capacitors cannot change suddenly, and the capacitor voltage will be forced to change abruptly. The present invention connects two sets of capacitors in parallel at both ends of the fast mechanical switch: the voltage dividing capacitor C 01 、C 02 and comparative capacitance C 0 , and for capacitance C 01 Connect a new capacitor in parallel: voltage regulating capacitor C 1 and C 2 . After parallel connection, the amplitude of voltage drop at one end of the voltage regulating capacitor connected in parallel with the fracture is as follows:

[0031]

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Abstract

The invention belongs to the field of high-voltage DC transmission and particularly relates to a design scheme of an adaptive capacitor voltage-limiting high-voltage DC circuit breaker. Two groups of capacitors are connected to two ends of a fracture of the circuit breaker in parallel, so that zero crossing of arc voltage and current is achieved through controllably incorporating new capacitors while the short-circuit current rise magnitude is limited, and the arc voltage and the current are limited within a relatively small amplitude range within a certain period of time; when a line normally runs, no current passes through a power electronic device, so that the power electronic loss of the circuit breaker is relatively small and the maintenance cost is low; and the original condition of relatively high fault current can be successfully broken within a relatively short period of time by virtue of current drawing and voltage limiting effects of voltage-dividing capacitors and comparison capacitors.

Description

technical field [0001] The invention belongs to the field of high-voltage direct current transmission, and in particular relates to a design scheme of an adaptive capacitor voltage limiting type high-voltage direct current circuit breaker. Background technique [0002] Compared with high-voltage AC transmission, high-voltage direct current (HVDC) transmission has obvious advantages in long-distance power transmission, asynchronous grid interconnection, island power transmission, and submarine cable transmission. HVDC circuit breakers are not only the key equipment for the safe operation and protection of DC systems, but also an important prerequisite for the development of multi-terminal DC transmission. However, the DC system current has no natural zero-crossing point, and its fault arc is difficult to extinguish, which greatly increases the technical difficulty of quickly breaking the high-voltage DC circuit breaker. [0003] Relevant scholars have proposed many design sc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02J3/36
Inventor 李凤婷解超路亮陶仁峰
Owner XINJIANG UNIVERSITY