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

Method for executing phasor correcting for synchronous phasor measuring apparatus

A synchronized phasor measurement and phasor technology, applied to measuring devices, measuring electrical variables, phase angles between voltage and current, etc., can solve the problems of difficult control of precision and complex implementation, and achieve fast calculation speed and accurate adaptation performance and high measurement accuracy

Active Publication Date: 2009-11-25
CHINA ELECTRIC POWER RES INST +1
View PDF0 Cites 33 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In view of the technical problems of complex implementation and difficult control of precision in the above-mentioned methods of the prior art, the purpose of the present invention is to provide a method for phasor correction by a synchronized phasor measurement device. The specific technical solution is as follows:

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 executing phasor correcting for synchronous phasor measuring apparatus
  • Method for executing phasor correcting for synchronous phasor measuring apparatus
  • Method for executing phasor correcting for synchronous phasor measuring apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0044] The implementation of the method for performing phasor correction by the synchronized phasor measurement unit (PMU) of the present invention will be described in detail below with reference to the accompanying drawings and specific examples.

[0045] figure 1 with figure 2 They are respectively a schematic diagram of an angle error curve and a schematic diagram of an amplitude error curve of a method for performing phasor correction at a system frequency offset when a power system synchronized phasor measurement unit (PMU) calculates a phasor according to the present invention;

[0046] The AC signal is converted into a frequency domain signal by Fourier transform to convert the input sampling value, so as to obtain the phasor value.

[0047] Discrete Fourier DFT transform, for continuous sampling sequence x k Take a data window of a certain length and perform discrete Fourier DFT transform to obtain the phasor.

[0048] The input signal sampling sequence is: x k =...

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 relates to a method for executing the phasor correcting for a synchronous phasor measuring apparatus, used for guaranteeing the accuracy of phasor calculating. In the method in the prior art, the hardware is adopted to measure the frequency and a method for adjusting a data window is adopted to guarantee the accuracy of the phasor measuring. In the method of the invention, a circuit positive sequence voltage is adopted to calculate the circuit frequency, after the offset deltaf of the system frequency relative to 50 Hz is calculated out, a least-squares method is adopted to fit the a series of amplitudes and angle error curve in 45 to 55 Hz, then the phasor is corrected by a look-up table. The method of the invention has fast computational speed, strong adaptability and high accuracy.

Description

technical field [0001] The invention relates to the field of application of power systems, in particular to a method for performing phasor correction by a synchronized phasor measurement unit (PMU), so as to ensure the accuracy of phasor calculation. Background technique [0002] The voltage and current signals of the AC power system can be represented by phasors, [0003] Assuming a sinusoidal signal: [0004] x ( t ) = 2 X cos ( 2 πft + φ ) - - - ( 2 - 1 ) [0005] It can be expressed as a phasor: [0006] X=Xe jφ =Xcosφ+jXsinφ=X R +jX I (2-2) [0007] The phasor consists of two parts, the magnitude X (effective value) and the phase angle , express...

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
IPC IPC(8): G01R25/00
Inventor 许勇王俊永詹荣荣熊敏
Owner CHINA ELECTRIC POWER RES INST
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com