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A DC fault self-clearing circuit for two-level voltage source converter

A technology for voltage source converters and DC faults, applied to electrical components, output power conversion devices, etc., can solve problems such as fault current rise, long cut-off time, converter impact, etc., and achieve a reduction in fault current rise, Reduced current stress and short response time

Active Publication Date: 2018-06-08
POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the long cut-off time of the AC circuit breaker, the fault current rises rapidly at this time, which will cause a large impact on the converter and affect the transient stability of the AC system.
The shortcomings of this existing technology limit the application of two-level voltage source converters in fields such as long-distance overhead line transmission and DC power grids

Method used

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  • A DC fault self-clearing circuit for two-level voltage source converter
  • A DC fault self-clearing circuit for two-level voltage source converter

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Embodiment Construction

[0029] The accompanying drawings are for illustrative purposes only and cannot be construed as limiting the patent;

[0030] In order to better illustrate this embodiment, some parts in the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0031] For those skilled in the art, it is understandable that some well-known structures and descriptions thereof may be omitted in the drawings.

[0032] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] Such as figure 1 As shown, a DC fault self-clearing circuit of a two-level voltage source converter, the DC fault self-clearing circuit consists of a zero-crossing shutdown circuit 2, a current limiting circuit 4, a first resonance generating circuit 3 and a second resonance generating circuit 6 components, and their position connections are as follows:

[0034] A zero-crossing shutdo...

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Abstract

The invention overcomes the technical defect that the existing two-level voltage source converter does not have the self-clearing capability of DC faults, and provides a DC fault self-clearing circuit for the two-level voltage source converter. The invention includes a zero-crossing shutdown circuit, a current limiting circuit, a first resonance generating circuit and a second resonance generating circuit. The invention has a simple structure and can realize the self-clearing of the DC fault without tripping the circuit breaker on the AC side. At the same time, since the response time of the circuit components is shorter than that of the AC circuit breaker, the rising range of the fault current is reduced, and the current stress of each component of the two-level voltage source converter is effectively reduced.

Description

technical field [0001] The invention relates to a DC fault self-clearing circuit, in particular to a DC fault self-clearing circuit for a two-level voltage source converter. Background technique [0002] Compared with conventional DC transmission, DC transmission (flexible DC transmission) based on voltage source converter has the advantages of independent control of active power and reactive power, power supply to passive systems, low harmonic level and small footprint. And there is no problem of reactive power compensation and commutation failure. Therefore, it has broad application prospects in the fields of wind power and other new energy grid connection and island power supply. [0003] The two-level voltage source converter is a typical circuit structure of flexible DC power transmission, but due to the bipolar short circuit on the DC side, even after the converter is quickly blocked, the AC system can still pass through the anti-parallel connection of the bridge arms...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32
CPCH02M1/32H02M1/325
Inventor 屠卿瑞曾耿晖李一泉焦邵麟张智锐李银红
Owner POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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