Mixed-pressure bipolar direct-current power transmission line zero-sequence parameter precisely measuring method

A technology for DC transmission lines and zero-sequence parameters, applied in capacitance measurement, inductance measurement, measurement device and other directions, which can solve the problems of many coupling parameters, long transmission distance of voltage level, and increased measurement error.

Active Publication Date: 2016-05-18
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the extremely high voltage level, extremely long transmission distance, and many coupling parameters of mixed-voltage DC transmission, it is extremely difficult to accurately measure line parameters
The existing transmission line parameter measurement method based on the lumped parameter model, the measurement error increases significantly with the increase of the transmission line length, so the influence of the distributed capacitance of the transmission line must be considered

Method used

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  • Mixed-pressure bipolar direct-current power transmission line zero-sequence parameter precisely measuring method
  • Mixed-pressure bipolar direct-current power transmission line zero-sequence parameter precisely measuring method
  • Mixed-pressure bipolar direct-current power transmission line zero-sequence parameter precisely measuring method

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Experimental program
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Effect test

Embodiment

[0064] Embodiment comprises the following steps:

[0065] Step 1, choose the blackout method to measure the parameters of the mixed-voltage bipolar DC line. The mixed-voltage bipolar DC line is composed of line a and line b, and each line is a bipolar transmission mode. The line model is as attached figure 1 shown.

[0066] Select blackout measurement, and use the following four independent measurement methods to measure the zero-sequence parameters of the mixed voltage DC transmission line:

[0067] (1) The two poles at the first end of line a are short-circuited and suspended, and the two end poles are short-circuited to ground; the two poles at the first end of line b are short-circuited and single-phase power is applied, and the two end poles are short-circuited to ground.

[0068] (2) The two poles at the first end of line a are short-circuited and a single-phase power supply is applied, and the two poles at the end are short-circuited to ground;

[0069] (3) The two po...

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PUM

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Abstract

The invention discloses a mixed-pressure bipolar direct-current power transmission line zero-sequence parameter precisely measuring method. Bipolar head ends and tail ends of direct power transmission lines different in voltage level are respectively connected, zero-sequence voltages and zero-sequence currents on head and tail ends of the mixed-pressure bipolar direct-current power transmission lines are simultaneously measured, and a global satellite positioning system is utilized to realize synchronous sampling of voltages and currents on double ends of the mixed-pressure bipolar direct-current power transmission lines; and then zero-sequence self-impedance, zero-sequence mutual-impedance, zero-sequence self-capacitive-reactance and zero sequence mutual-capacitive-reactance of the mixed-pressure bipolar direct-current power transmission lines are obtained by means of calculation. According to the invention, a distributed constant model of the mixed-pressure bipolar direct-current power transmission lines is established, and the influences of distributed capacitance on the measuring result are considered, so that the precision of mixed-pressure bipolar direct-current power transmission line zero-sequence parameter measurement is substantially improved.

Description

technical field [0001] The invention belongs to the technical field of power system measurement, in particular to a method for accurately measuring zero-sequence parameters of a mixed-voltage bipolar direct current transmission line. Background technique [0002] The transmission line is one of the main components of the power system, and it is also the carrier of power transmission, which plays a great role in the power system. Transmission line parameters are the basic data for relay protection setting and fault location. For DC lines, DC resistance is used in the process of normal operation; power frequency zero-sequence parameters are used in both normal operation and failure. Due to the long transmission distance, high-voltage DC lines are easily affected by the surrounding AC lines. Due to the coupling effect, power frequency currents will be generated on the DC lines; secondly, the asymmetrical end impedance will also generate power frequency zero-sequence currents o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/08G01R27/26
CPCG01R27/08G01R27/2605G01R27/2611
Inventor 胡志坚倪识远
Owner WUHAN UNIV
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