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Phase-shifting fail ture by couting discrimination

A technology of commutation failure and counting times, which can be applied to the fault location and other directions, and can solve the problem of not being able to truthfully reflect the commutation failure times of the converter valve group.

Active Publication Date: 2009-08-19
NR ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The disadvantage of the existing method for judging the commutation failure of the converter valve group: it cannot truthfully reflect the number of commutation failures of the converter valve group within a period of time

Method used

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  • Phase-shifting fail ture by couting discrimination
  • Phase-shifting fail ture by couting discrimination
  • Phase-shifting fail ture by couting discrimination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] Read the sampled value and convert the AC measured current into a DC current. Calculate equations (3) and (4) to get the count pulse.

[0047] Use similar image 3 The block diagram of the realization of the single bridge and double bridge commutation failure counting principle protection. details as follows:

[0048] Y-bridge commutation failure counting principle adopts image 3 Implementation block diagram. The principle of D-bridge commutation failure counting times will be image 3 In the block diagram of the implementation, ‘satisfy condition (3)’ is changed to ‘satisfy condition (4)’. The principle of double-bridge commutation failure counting image 3 In the block diagram of the realization of ‘satisfy condition (3)’ changed to ‘satisfy condition (3) or condition (4)’.

[0049] The enable terminal can easily switch to and withdraw the protection based on this principle. Conducive to debugging and other applications.

[0050] The time width window is a dynamic continuous...

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Abstract

The measured method to judge the phase conversion failure, it is composed of the 2 following parts: phase conversion failure judgment component and measured component, the measured method is divided into single bridge and couple bridge and any bridge measured; The single bridge is divided into Y bridge measured and D bridge measured; a phase conversion failure matched the condition records Y bridge measured pulse; or a phase conversion failure matched the condition records D bridge measured pulse; each phase conversion failure matched the condition records a couple bridge measured pulse; Y bridge or D bridge or couple bridge measured pulse is switched in the measured pulse input end of the measured component respectively; phase conversion is in the setting time width , the measured number reaches the setting measured fixed value , doing the protect action based on phase conversion failure principle.

Description

1. Technical Field [0001] The invention relates to a new method for judging the commutation failure of a converter valve group for high-voltage direct current transmission, and a relay protection device. 2. Background technology [0002] Due to its unique advantages, such as long distance, high power, asynchronous networking, fast power regulation, power flow controllability, and power transmission economy, HVDC power transmission is more and more widely used. The core of the HVDC system is the HVDC control and protection system, which includes a control system and a protection system. The most important equipment of the HVDC system is the converter valve block. [0003] The commutation failure of the converter valve group is a common fault and phenomenon in HVDC transmission. Problems such as AC system disturbance or trigger pulse circuit will cause the commutation failure of the converter valve group. The commutation failure of the continuous converter valve group in the system...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
Inventor 李海英王俊生卢宇
Owner NR ELECTRIC CO LTD
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