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A high voltage direct current transmission line protection device based on single-end transient quantity

A technology for high-voltage direct current and transmission lines, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as poor reliability and insufficient sensitivity, and achieve the effects of quick distinction, small amount of calculation, and strong practicability

Inactive Publication Date: 2018-12-21
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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Problems solved by technology

[0003] General DC line main protection has problems such as insufficient sensitivity and poor reliability

Method used

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  • A high voltage direct current transmission line protection device based on single-end transient quantity

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Embodiment Construction

[0013] The present invention provides a high-voltage direct current transmission line protection device based on single-ended transient quantities. The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0014] figure 1 Shown is the functional block diagram of the high-voltage direct current transmission line protection device based on the single-ended transient quantity, which mainly includes a starting element, a transient quantity direction element, a boundary element, a fault pole discrimination element, and a lightning strike interference discrimination element. The starting element uses a gradient algorithm to detect voltage changes, and then judges whether there is a fault in the DC transmission system. The criterion expression is:

[0015] (1)

[0016] (2)

[0017] In the formula: i = 1,2,3; is the voltage sampling value after the i-th sampling period at the current moment; i...

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Abstract

The invention provides a high-voltage direct-current transmission line protection device based on a single-end transient quantity, comprising a starting element, a transient quantity direction element, a boundary element, a fault pole judging element and a lightning stroke interference judging element. A starting element detects a change in a voltage signal to determine if a fault has occurred inthe system, so that subsequent calculation of that protection are initiated, transient directional element, boundary element, the fault pole discriminating element and the lightning stroke disturbancediscriminating element are independent of each other, Each element determines whether to generate an allowable signal (high level) according to the respective calculation results. The protector runsin a mode based on point-by-point sampling calculations, As the protection element satisfies the program setting and the criterion, the correspond command can be sent, In the program, the permissiblesignals generated at the inputs of AND gates are held for a period of time, and the permissible signals from other modules are waited for during this period. When the four inputs are all high, the protection device determines that the line is faulty, and issues a line restart command for the HVDC control and protection system to start the line restart logic.

Description

technical field [0001] The invention belongs to the field of power systems, in particular to the field of relay protection for direct current transmission lines, in particular to a protection device for high voltage direct current transmission lines based on single-ended transient quantities. Background technique [0002] High-voltage direct current transmission has obvious advantages in long-distance large-capacity power transmission and power system networking. At present, China has put into operation more than 20 direct current transmission lines with voltage levels of ±500, ±660 and ±800kV, and there are many direct current transmission projects Under construction. As an integral part of the protection system of DC transmission projects, DC line protection undertakes the major task of quickly detecting and clearing line faults, and its performance directly affects the operation performance of the entire DC transmission project. [0003] The general DC line main protecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/262H02H7/263H02H7/268
Inventor 李卫国杨洪达黄晓义高泽盟陈艳
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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