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Short trouble protective method for converter valve assembly

A short-circuit fault, converter valve technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as protection misoperation and calculation errors, and achieve the effect of avoiding misoperation and ensuring reliability and safety.

Active Publication Date: 2006-12-13
NR ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0031] 3. Both methods will calculate the wrong |IVD| due to the saturation of the current transformer CT or the inconsistency of the characteristics of the three-phase CT, thus causing the protection to malfunction

Method used

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  • Short trouble protective method for converter valve assembly
  • Short trouble protective method for converter valve assembly

Examples

Experimental program
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Effect test

Embodiment Construction

[0078] Read the sampling value (instantaneous value) of the winding current on the valve side, convert the current of the winding on the valve side into a DC current by using formula (1); read the sampling value of the AC bus voltage, calculate the amplitude of each phase of the AC voltage, and the low voltage setting (conventional 0.7 per unit) comparison to obtain a low-voltage blocking element ((6) formula).

[0079] Calculate (2), (3), (4), (5) and use the calculation results to carry out figure 2 logical judgment.

[0080] Reference for setting value selection: Ivss is about 0.5±0.1 times the DC rated current, k is about 0.2, k1 is about 0.97, Uac_set is about 0.7±0.1 times the rated voltage of the AC network side; the time setting T1 is about 0.5±0.1ms, T2 is about 4±0.5ms.

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PUM

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Abstract

The invention discloses a short-circuit accident protective method of converting valve group, which comprises the following judging expression formulas: |IVY|-IDP>Ivss+k*|IVY|, |IVD|-IDP>Ivss+k*|IVD|(2); |IVY|-IDNC>Ivss+k*|IVY|, |IVD|-IDNC>Ivss+k*|IVD|(3), wherein IVY and IVD is equivalent DC current; Ivss and k are constant; IDP is DC current for electrode bus valve side; IDNC is DC current for neutral bus valve side; if the conversing valve group occurs short circuit, (2) or (3) satisfies. The invention guarantees the reliability and safety for valve group, which avoids error movement in the measuring course.

Description

1. Technical field [0001] The invention relates to a new method for judging the fault of a converter valve group in a high-voltage direct current transmission system, in particular to a method and a device for relay protection for judging a fault of a valve group by using the AC side current and the DC measuring current of the converter valve. 2. Background technology [0002] Due to its unique advantages, such as: long distance, high power, asynchronous networking, fast power adjustment, power flow controllability, transmission economy, etc., HVDC transmission is more and more widely used. The core of the HVDC transmission system is the HVDC control and protection system, which includes a control system and a protection system. [0003] The converter valve bank is a critical, complex and expensive component in the HVDC transmission system. Among them, the short-circuit fault of the valve arm is a common fault of the converter valve group. The short-circuit fault of the va...

Claims

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Application Information

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IPC IPC(8): H02H7/10H02H7/122H02H7/125
Inventor 卢宇李海英王俊生
Owner NR ELECTRIC CO LTD
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