Fault identification method for UHVDC transmission line based on current characteristic quantity

A technology for UHV DC and transmission lines, applied in the direction of fault location, fault detection according to conductor type, etc., can solve problems such as identification methods of unseen faults, and achieve the effect of improving performance

Active Publication Date: 2019-05-28
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

These methods either calculate the correlation coefficient of a certain component of voltage or current (such as traveling wave, transient voltage), or combine the component performance equation, and there is no fault identification method based on the correlation analysis of the current at both ends.

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  • Fault identification method for UHVDC transmission line based on current characteristic quantity
  • Fault identification method for UHVDC transmission line based on current characteristic quantity
  • Fault identification method for UHVDC transmission line based on current characteristic quantity

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Embodiment Construction

[0037] Below in conjunction with the accompanying drawings, the present invention is simulated and verified with a simulation model.

[0038] The line model is a ±800kV / 5kA bipolar UHVDC model, and the parameters of the primary circuit are derived from actual projects. The line adopts the frequency-dependent (phase) model, the total length is 1891km, the representative span is 500m, and the sag is 26m. The specific parameters of the tower are as follows: figure 2 shown. The conductor adopts 6 splits, the equivalent radius is 0.4572m, the type is twisted wire, the total number of strands is 52, the number of outermost strands is 21, the radius of each strand is 2.265mm, and the resistance is 0.03984Ω / km. The resistances of ground wires 1 and 2 are 0.4696Ω / km and 0.465Ω / km respectively. The rectifier side adopts constant current control, and the inverter side adopts constant voltage control; the rated firing angle of the rectifier side is 13°, and the rated arc extinguishing ...

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Abstract

The invention belongs to the high-voltage direct-current transmission technical field and relates to a current characteristic quantity-based extra high-voltage direct-current transmission line fault recognition method. The method includes the following steps that: 1) an intermediate quantity is constructed: current at two ends of a line is summated, and the sum of the current at the two ends of the line is divided by 2, anti-synchronous change components are partially offset, and synchronous change components are amplified, the difference of the current at the two ends is divided by 2, and synchronous change components are partially offset, and anti-synchronous change components are amplified, and the per-unit value of the current at the two ends is obtained; 2) a criterion characteristic quantity r is constructed: b correlation coefficients are accumulated according to the intermediate quantity constructed in the step 1), the ranges of accumulation which is performed twice are not overlapped; 3) criteria are set up: three kinds of action criteria are set for the r value; and 4) the criteria are set: constant values involved in the criteria are subjected to setting calculation; and 5) the criteria are locked.

Description

technical field [0001] The invention belongs to the technical field of high-voltage direct current transmission, and in particular relates to a fault identification method for UHV direct current transmission lines based on current characteristic quantities. Background technique [0002] Ultra-high voltage direct current (UHVDC) transmission lines are often more than 1000km, and the climate / terrain along the line is complex, and the probability of line failure increases, so the role of the relay protection system becomes more important. The classic scheme of UHVDC line protection is traveling wave protection as the main protection, differential undervoltage protection and longitudinal differential protection as backup protection, and transverse differential protection as backup protection in the metal loop operation mode. Among them, the positioning of the longitudinal differential protection is to protect the high-impedance ground fault of the whole line. In practice, the l...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/085
Inventor 戴志辉严思齐朱惠君苏怀波
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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