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High-voltage direct-current power transmission line non-unit protection method based on S transformation

A technology for DC transmission lines and transmission lines, applied in emergency protection circuit devices, electrical components, emergency protection detection and other directions, can solve the problems of no action speed and high sensitivity, and achieve strong quickness, reliability and sensitivity. The effect of high practical value

Inactive Publication Date: 2016-07-20
SHANDONG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0010] It can be seen that the existing research on the protection of HVDC transmission lines does not have a method that has a fast action speed, is not affected by factors such as transition resistance and lightning interference, and has a high sensitivity.

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  • High-voltage direct-current power transmission line non-unit protection method based on S transformation
  • High-voltage direct-current power transmission line non-unit protection method based on S transformation
  • High-voltage direct-current power transmission line non-unit protection method based on S transformation

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Embodiment Construction

[0043] The present invention will be further described below with reference to the drawings and examples.

[0044] Such as Figure 5 As shown, a single-ended protection method for HVDC transmission lines based on S-transformation includes the following steps:

[0045] (1) Real-time collection of the voltage at the protection element connected to each pole of the DC transmission line at the protection installation on the rectifier side of the system;

[0046] (2) After filtering the collected voltage, extract the voltage fault component of 5ms after the fault, and calculate the line mode voltage;

[0047] (3) S-transform the line mode voltage component at the system protection installation to obtain its complex time-frequency S matrix, and calculate the S-transform transient energy and W of the high-frequency components above 3kHz. H And the S-transform transient energy and W of the low frequency component between 100~500Hz L , And obtain the high and low frequency energy ratio λ, compa...

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Abstract

The invention discloses a high-voltage direct-current power transmission line non-unit protection method based on S transformation. Amplitude-frequency characteristic analysis on boundaries formed by smoothing reactors and direct-current filters at two ends of a high-voltage direct-current power transmission line shows that high / low frequency components of line-mode voltage component traveling wave signals can be attenuated to different extents when passing through boundaries of direct-current lines. The method comprises the following steps: accurately extracting specific frequency band components through S transformation, building protection judgment basis, and proposing an internal / external zone fault recognition method based on ratio differences of high / low frequency components in S transformation; comparing transient state energy sums of S transformation at different frequency bands in lightning stroke interference, lightning stroke faults and ordinary short circuit faults, and building S transformation energy ratio judgment basis for recognizing lightning stroke interference; and extracting S transformation zero frequency band transient state energy of transient state energy of voltage of two poles, and building ratio judgment basis, thereby accurately recognizing fault poles.

Description

Technical field [0001] The invention relates to a single-ended protection method of a high-voltage direct current transmission line based on S conversion. Background technique [0002] HVDC transmission technology originated in the 1960s. Due to the development of converter equipment, HVDC transmission technology has been rapidly developed worldwide in recent years. HVDC transmission has the advantages of stable power transmission, large transmission capacity, high transmission efficiency, and long-distance transmission. It has become an important way for large energy bases to transmit power and asynchronous grid interconnection. It is also an important way for my country to develop clean energy and control smog. Important means. Since the relay protection level of the DC transmission system has a significant impact on the stability and safety of the power system, the research on the rapid protection technology of the DC transmission system has important theoretical significance ...

Claims

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Application Information

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IPC IPC(8): H02H7/26
CPCH02H7/268H02H1/0007H02H7/226H02H7/265
Inventor 邹贵彬李钊高厚磊
Owner SHANDONG UNIV
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