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Fault handling method, fault handling device and direct current transmission system

A technology of direct current transmission system and fault handling method, which is applied to emergency protection circuit devices, electrical components, power transmission AC networks, etc., and can solve problems such as unfavorable system stability and endangering equipment safety

Active Publication Date: 2022-04-05
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for permanent faults, fault current will be generated again, which will endanger the safety of equipment and is not conducive to system stability.

Method used

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  • Fault handling method, fault handling device and direct current transmission system
  • Fault handling method, fault handling device and direct current transmission system
  • Fault handling method, fault handling device and direct current transmission system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Such as figure 1 As shown, according to the embodiment of the first aspect of the present invention, a fault handling method for a direct current transmission system is proposed, wherein the direct current transmission system includes a direct current circuit breaker, such as Figure 9 As shown, the DC circuit breaker includes a current carrying branch 820, a solid state switching branch 840, and a snubber absorbing branch 860, the method comprising:

[0059] Step 102, turning off the DC circuit breaker in response to a fault signal of the DC transmission system;

[0060] Step 104, turn on the solid-state switch branch after the de-ionization period;

[0061] Step 106, obtaining the voltage and current of the transmission line of the direct current transmission system;

[0062] Step 108, determine the ratio of voltage and current;

[0063] Step 110, determining the fault state of the direct current transmission system according to the ratio;

[0064] Step 112, contr...

Embodiment 2

[0068] Such as figure 2 As shown, according to an embodiment of the present invention, a fault handling method for a direct current transmission system is proposed, wherein the direct current transmission system includes a direct current circuit breaker, such as Figure 9 As shown, the DC circuit breaker includes a current carrying branch 820, a solid state switching branch 840, and a snubber absorbing branch 860, the method comprising:

[0069] Step 202, shutting off the DC circuit breaker in response to a fault signal of the DC transmission system;

[0070] Step 204, turn on the solid-state switch branch after the de-ionization period;

[0071] Step 206, obtaining the voltage and current of the transmission line of the direct current transmission system;

[0072] Step 208, determine the ratio of voltage and current;

[0073] Step 210, whether the ratio is greater than the failure threshold, if so, enter step 212, if not, enter step 214;

[0074] Step 212, determining th...

Embodiment 3

[0084] Such as image 3 As shown, according to an embodiment of the present invention, a fault handling method for a direct current transmission system is proposed, wherein the direct current transmission system includes a direct current circuit breaker, such as Figure 9 As shown, the DC circuit breaker includes a current carrying branch 820, a solid state switching branch 840, and a snubber absorbing branch 860, the method comprising:

[0085] Step 302, shutting off the DC circuit breaker in response to a fault signal of the DC transmission system;

[0086] Step 304, turn on the solid-state switch branch after the de-ionization period;

[0087] Step 306, obtaining the voltage and current of the transmission line of the direct current transmission system;

[0088] Step 308, determine the ratio of voltage and current;

[0089] Step 310, whether the ratio is greater than the failure threshold, if so, enter step 312, if not, enter step 314;

[0090] Step 312, determining tha...

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Abstract

The invention provides a fault processing method, a fault processing device and a direct current transmission system. Wherein, the method includes: responding to a fault signal of the direct current transmission system, turning off the direct current circuit breaker; turning on the solid-state switch branch after a de-ionization time period; obtaining the voltage and current of the transmission line of the direct current transmission system; determining the ratio of the voltage and the current ; Determine the fault state of the DC transmission system according to the ratio; control the DC circuit breaker according to the fault state. Therefore, after the deionization is completed, the fault state is identified, and reclosing is only performed after it is judged as a transient fault, and no reclosing is performed after it is judged as a permanent fault, and the faulty pole converter is directly blocked, without generating additional voltage, In the case of current impact, only the electrical quantity is used to realize the adaptive reclosing of the DC circuit breaker, effectively avoiding the secondary impact of reclosing on the transmission system caused by permanent faults, and improving the safety of the DC transmission system.

Description

technical field [0001] The present invention relates to the technical field of direct current transmission systems, in particular, to a fault handling method for a direct current transmission system, a fault handling device for a direct current transmission system, and a direct current transmission system. Background technique [0002] Flexible DC transmission technology has the advantages of low loss, independent and rapid control of active and reactive power, and no commutation failure problem, etc., and has broad development prospects. In flexible direct current transmission projects that have been put into operation, modular multilevel converters based on half-bridge sub-modules are widely used. The DC overhead transmission line in operation is prone to failure, and the fault current will rise rapidly after the line failure, which will endanger the safety of equipment. Installing hybrid DC circuit breakers at both ends of the line can quickly cut off the fault current. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02J3/36
CPCH02H7/268H02J3/36Y02E60/60
Inventor 董新洲蔡静
Owner TSINGHUA UNIV