Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for measuring power frequency parameters of superhigh/extrahigh-voltage alternating-current (direct-current) power transmission circuit

A technology of UHV AC and measurement methods, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc.

Inactive Publication Date: 2014-03-26
WUHAN UNIV
View PDF6 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing measurement methods use lumped parameter models, which are only suitable for measuring zero-sequence parameters of short-distance transmission lines

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for measuring power frequency parameters of superhigh/extrahigh-voltage alternating-current (direct-current) power transmission circuit
  • Method for measuring power frequency parameters of superhigh/extrahigh-voltage alternating-current (direct-current) power transmission circuit
  • Method for measuring power frequency parameters of superhigh/extrahigh-voltage alternating-current (direct-current) power transmission circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0149] Measure power frequency zero-sequence parameters of single-circuit EHV / UHV AC transmission current lines.

[0150] Step 1: Use the measurement method of three-phase short-circuit at the first end of the line to apply power frequency zero-sequence voltage, and three-phase short-circuit at the end of the line to ground, and use the global satellite positioning system technology to realize the zero-sequence voltage and zero-sequence current at the beginning and end of the line Synchronous sampling to obtain a set of synchronous zero-sequence power data.

[0151] Step 2: Use the Fourier filter method to process the zero-sequence voltage and zero-sequence current data obtained in step 1, and obtain the power-frequency zero-sequence voltage phasor and power-frequency zero-sequence current phasor at the head end and end of the single-circuit line.

[0152] In this embodiment, when the Fourier filter method is used to process the power frequency zero-sequence power data of a si...

Embodiment 2

[0164] Measure the power frequency zero-sequence parameters of double-circuit EHV / UHV AC transmission lines.

[0165] Step 1: When measuring the power frequency zero-sequence voltage and power frequency zero-sequence current of the double-circuit AC transmission line, select at least two groups of measurement operation modes from Table 1 for synchronous sampling; use the global satellite positioning system technology to realize the head-end of each line And the synchronous sampling of power frequency zero-sequence voltage and power frequency zero-sequence current at the end, so as to obtain several sets of synchronous power frequency zero-sequence power data.

[0166] Step 2: Use the Fourier filter method to process the zero-sequence voltage and zero-sequence current data obtained in step 1, and obtain the power-frequency zero-sequence voltage phasor and power-frequency zero-sequence current phasor at the head end and end of each circuit.

[0167] In this embodiment, when meas...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for measuring power frequency parameters of superhigh / extrahigh-voltage alternating-current (direct-current) power transmission circuit. The method is characterized by comprising the steps of synchronously measuring zero-sequence voltage and zero-sequence current on the head end and the tail end of the power transmission circuit, obtaining a power-frequency zero-sequence voltage phasor and a power-frequency zero-sequence current phasor by utilizing a Fourier filtering method, solving the power-frequency zero-sequence parameters of the power transmission circuit on the basis of a differential equation model and particle swarm optimization of the power transmission circuit, considering the influence of electromagnetic coupling between a distributive capacitor and the circuit on the power transmission circuit on the measurement of the power-frequency zero-sequence parameters, so that the precision of the power-frequency zero-sequence parameter measurement result of the power transmission circuit can be improved. The method is not only suitable for measuring the power-frequency zero-sequence parameter of a single-circuit and a multi-circuit superhigh / ultrahigh voltage alternating-current power transmission circuit, particularly suitable for measuring the power-frequency zero-sequence parameters of a double-circuit and four-circuit superhigh / ultrahigh voltage alternating-current power transmission circuit of a same tower and also suitable for remotely measuring the power-frequency parameters of the superhigh / ultrahigh voltage direct-current power transmission circuit.

Description

technical field [0001] The invention belongs to the technical field of parameter measurement of power system transmission lines, in particular to a method for measuring power frequency parameters of super / ultra-high voltage AC (DC) transmission lines. Background technique [0002] The transmission line is one of the main components of the power system and the carrier of power transmission. The parameters of AC transmission lines mainly refer to power frequency parameters, including positive sequence resistance, positive sequence inductance, positive sequence capacitance, zero sequence resistance, zero sequence inductance, zero sequence capacitance, and mutual resistance, mutual inductance and mutual capacitance etc. The power frequency parameters of the DC transmission line mainly refer to the power frequency self-resistance, power frequency self-inductance, power-frequency self-capacitance of each pole of the DC line, and the power-frequency mutual resistance, power-freque...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 胡志坚贾超
Owner WUHAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com