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Calibration method, device and system for measuring phasor at both ends of double-circuit transmission line on the same pole

A technology of double-circuit transmission lines and transmission lines, which is applied in the directions of measuring devices, measuring electrical variables, measuring electricity, etc., can solve the problem of no asynchronous phase correction method and so on.

Active Publication Date: 2020-12-01
STATE GRID JIANGSU ELECTRIC POWER CO LTD MAINTENANCE BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is no systematic non-synchronous phase correction method for the phasor at both ends of the line measured by the fault recording equipment

Method used

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  • Calibration method, device and system for measuring phasor at both ends of double-circuit transmission line on the same pole
  • Calibration method, device and system for measuring phasor at both ends of double-circuit transmission line on the same pole
  • Calibration method, device and system for measuring phasor at both ends of double-circuit transmission line on the same pole

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Experimental program
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Effect test

Embodiment 1

[0048] Such as figure 2 As shown, it is a typical topological structure of a double-circuit transmission line on the same pole. Based on this, the present invention proposes a correction method for measuring phasors at both ends of a double-circuit transmission line on the same pole, specifically for a double-circuit transmission line on the same pole The phase correction method of the asynchronous measurement phasor at both ends, the overall process is as follows figure 1 As shown, it specifically includes the following steps:

[0049] Step (1) Set measurement points at the head and end of the transmission line to obtain the steady-state voltage and current phasors at both ends of the double-circuit transmission line in normal operation, which are denoted as U s , I s , U e and I e , where U s , I s Respectively represent the steady-state voltage and current phasor at the head end of the double-circuit line; U e , I e Respectively represent the steady-state voltage a...

Embodiment 2

[0073] An embodiment of the present invention provides a phase correction device for asynchronously measuring phasors at both ends of a double-circuit transmission line on the same pole, including:

[0074] The obtaining module is used to obtain the steady-state voltage and current phasors at both ends of the double-circuit transmission line in normal operation, denoted as U s , I s , U e and I e , where U s , I s are the steady-state voltage and current phasors at the head end of the double-circuit transmission line, respectively, U e , I e are the steady-state voltage and current phasors at the end of the double-circuit transmission line, respectively;

[0075]The first calculation module is used to calculate the same-sequence and positive-sequence components of the voltage at the head end of the double-circuit transmission line based on the steady-state voltage and current phasor at both ends of the double-circuit transmission line by using the six-sequence component ...

Embodiment 3

[0081] An embodiment of the present invention provides a phase correction system for asynchronously measuring phasors at both ends of a double-circuit transmission line on the same pole, including:

[0082] A processor, adapted to implement instructions; and a storage device, adapted to store a plurality of instructions, and the instructions are adapted to be loaded by the processor and execute the steps described in any one of Embodiment 1.

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Abstract

The invention discloses a calibration method, device and system for phasor measurement at both ends of a double-circuit transmission line on the same pole. The method comprises steps that steady-statevoltage and current vectors at both ends of the double-circuit transmission line in normal operation are obtained; steady-state voltage and current same sequence positive sequence components of the double-circuit transmission line and the same sequence positive sequence wave impedance and a propagation constant of the double-circuit transmission line are calculated through a six-sequence component method; the steady-state voltage and current same sequence positive sequence components at both ends of the double-circuit transmission line, and the same sequence positive sequence wave impedance and the propagation constant of the double-circuit transmission line are utilized to calculate same sequence positive sequence voltage phasors at different distances from a head end of the double-circuit transmission line; the step size is set based on steady-state voltage and current phases of the head end of the double-circuit transmission line, non-synchronized phase difference of the measured steady-state voltage and current phases at the end of the line at different distances from the head end of the double-circuit transmission line and actual phases is solved, and an average value of thenon-synchronized phase difference is solved. The method is advantaged in that higher phase correction accuracy can be achieved without synchronous measurement.

Description

technical field [0001] The invention belongs to the field of phase measurement of transmission lines, and in particular relates to a correction method, device and system for measuring phasors at two ends of a double-circuit transmission line on the same pole. Background technique [0002] With the rapid growth of my country's economy, the scale and quantity of power loads are increasing, and users' requirements for power grids are constantly increasing. Compared with single-circuit power transmission, multi-circuit power transmission has higher transmission power and higher system power transmission reliability, and is currently widely used in high-voltage power transmission systems. [0003] Compared with the synchrophasor measurement unit (Phasor Measurement Unit, PMU), fault recording equipment is widely used in 220kV and above transmission lines due to its advantages of low cost and convenient waveform recording. However, for a transmission line, there is a certain asyn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R25/00
CPCG01R25/005G01R31/088
Inventor 崔玉程真何刘贞瑶彭楠陈轩梁睿
Owner STATE GRID JIANGSU ELECTRIC POWER CO LTD MAINTENANCE BRANCH
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