Failure direction judgment element and judgment method for direct current transmission line

A DC transmission line and fault discrimination technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as long fault duration, long operation time, unfavorable safe and stable operation of DC transmission projects, etc., to improve safety and stability Sexuality, reduced workload, and the effect of preventing malfunction

Inactive Publication Date: 2012-07-18
XI AN JIAOTONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the DC line differential protection takes a long time to operate and the fault lasts for a

Method used

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  • Failure direction judgment element and judgment method for direct current transmission line
  • Failure direction judgment element and judgment method for direct current transmission line
  • Failure direction judgment element and judgment method for direct current transmission line

Examples

Experimental program
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Embodiment Construction

[0040] like figure 1 As shown, the left side of the DC circuit DC is the rectification side, and the right side is the inverter side. The circuit includes DC bus W at both ends; reactive power sources P1, P2; circuit breaker Q; converter valves V1, V2; smoothing reactors L1, L2; AC filter banks L1, L2; DC filter bank L3 , L4; protect TbP.

[0041] The protection TbP is installed on the rectification side of the system, and the positive direction of the specified current is the attached figure 1 The arrow to the right in the middle indicates that the DC polarity bus flows to the line, the fault f1 is located in the positive direction of the line protection, and the fault f2 is located in the opposite direction of the line protection. When a fault occurs at a certain point on the line, under the action of an additional voltage source at the fault point, a traveling wave will be generated from the fault point to both ends of the line. The forward wave Δu propagating in the pos...

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Abstract

The invention discloses a single-ended transient signal-based failure direction judgment element and a single-ended transient signal-based failure direction judgment method for an ultrahigh speed direct current transmission line. The element comprises a failure component calculation unit, a forward wave and backward wave energy calculation unit, and a comparison and command transmission unit. A failure direction is judged by comparing a calculated forward wave energy value with a calculated backward wave energy value, a failure is determined as a positive failure if the forward wave energy value is lower than the backward wave energy value, and on the contrary, the failure is determined as a negative failure, and a corresponding command is transmitted. A test result shows that the failure direction judgment element for the direct current transmission line can be used for accurately distinguishing the positive and negative failures of the line under different direct current transmission projects and the operating conditions of the different direct current transmission projects only by utilizing single-ended voltage and current signals of the line without the influence of a failure position and transition resistance and that only a normalized wave impedance value is required to be calculated for the protection and setting of the different direct current transmission projects so as to reduce the workload of protection workers and field operators.

Description

Technical field: [0001] The invention belongs to the field of DC high-voltage transmission line protection in power systems, and relates to a line protection method for fast detection of faults in the forward and reverse directions of DC transmission lines, in particular to a method for realizing directional components of ultra-high-speed DC lines based on transient signals. Background technique: [0002] "West-to-east power transmission, north-south mutual supply, and national networking" are the basic strategies for China's energy and power industry construction in the 21st century. HVDC transmission has obvious advantages in long-distance large-capacity power transmission and power system networking, such as realizing asynchronous networking between power systems, quickly adjusting transmission power, etc. a very effective means. China began to develop direct current transmission projects in the 1980s. By the end of 2004, China had become the largest country in direct cu...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01R31/02
Inventor 张保会郝治国甄威孔飞
Owner XI AN JIAOTONG UNIV
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