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Novel single-ended protection method for high-voltage direct-current power transmission line

A technology for high-voltage direct current and transmission lines, which is applied to emergency protection circuit devices, short-circuit tests, electrical components, etc., and can solve problems such as insufficient consideration of sampling rate requirements and insufficient sensitivity

Active Publication Date: 2021-09-10
GUANGXI UNIV
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Problems solved by technology

[0006] Although the protection scheme proposed in the above literature only uses single-ended electrical quantities to identify the fault section, it does not fully consider the requirements for sampling rate in actual engineering, and fails to solve the problems caused by high-impedance grounding faults to a large extent. The problem of insufficient sensitivity

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  • Novel single-ended protection method for high-voltage direct-current power transmission line
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  • Novel single-ended protection method for high-voltage direct-current power transmission line

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Embodiment Construction

[0049] In order to better understand the present invention, the present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0050] Such as figure 1 As shown, a new single-ended measurement protection method for HVDC transmission lines includes the following steps:

[0051] S1: Establish the electromagnetic transient simulation model of the bipolar HVDC transmission system, conduct fault simulation inside and outside the line area, collect the current of the line boundary protection device; calculate the difference between the transient current obtained by the line boundary protection device and the DC current during normal operation of the system , that is, the value of the sudden change in current; four line boundary protection devices are set, which are respectively installed at the head end (ie, the rectification side) and the end (ie, the inverter side) of the positive DC transmission line, and the head end (ie, the...

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Abstract

The invention relates to the field of high-voltage direct-current power transmission relay protection, in particular to a novel single-ended protection method for a high-voltage direct-current power transmission line. The method specifically comprises the following steps of: establishing an electromagnetic transient simulation model of a bipolar high-voltage direct-current power transmission system, performing internal and external fault simulation of a line area, obtaining transient current of a line boundary protection device, calculating a current break variable amplitude and taking the current break variable amplitude as an electric quantity required by protection starting, and extracting a characteristic frequency band component of the transient current as a characteristic electrical quantity for identifying a fault section and fault pole selection. Whether the direct current system breaks down or not is judged according to whether the transient current break variable amplitude value is greater than a protection starting threshold value or not under the fault condition, a corresponding fault interval is judged according to whether the Shannon entropy value of the extracted transient current characteristic frequency band component is greater than a protection action threshold value or not, and a fault polar line is selected according to the ratio of the transient current characteristic frequency band component amplitude integral detected by the two-pole line boundary protection device. The method still has relatively high sensitivity when a high transition resistance fault occurs.

Description

technical field [0001] The invention relates to the field of high voltage direct current transmission relay protection, in particular to a novel single-ended protection method for high voltage direct current transmission lines. Background technique [0002] In the high-voltage direct current transmission system, the length of the direct current transmission line can reach thousands of kilometers, so the direct current line has become the component with the highest failure rate in the direct current system, and the fault of the line poses a serious threat to the safe and reliable operation of the entire direct current transmission system. For this reason, it is urgent to develop a protection scheme with high reliability and excellent performance to be applied in practical engineering. [0003] Most of the existing protection configurations for HVDC transmission lines use traveling wave protection as the main protection, and differential undervoltage protection and current dif...

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Application Information

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IPC IPC(8): H02H7/26G01R31/08G01R31/52
CPCH02H7/268G01R31/08G01R31/52Y02E60/60
Inventor 韩昆仑宋世勇宋海根陈锋元张腾跃
Owner GUANGXI UNIV
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