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

Synchronous phasor measurement method based on self-adoption variable window

A synchronous phasor measurement and self-adaptive technology, applied in measurement devices, measurement of electrical variables, frequency measurement devices, etc., can solve problems such as spectrum leakage and phasor measurement accuracy decline

Inactive Publication Date: 2012-09-19
NAVAL UNIV OF ENG PLA
View PDF6 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But when the frequency offset is large, the accuracy of phasor measurement will drop rapidly due to the spectral leakage caused by asynchronous sampling

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
  • Synchronous phasor measurement method based on self-adoption variable window
  • Synchronous phasor measurement method based on self-adoption variable window
  • Synchronous phasor measurement method based on self-adoption variable window

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0077]The technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention.

[0078] The self-adaptive sampling synchrophasor method adopted in the present invention is used for the synchrophasor measurement in the ship power system, and the measurement result is compensated for the difference, which greatly improves the accuracy of the synchrophasor measurement. The step phasor The method includes the following steps:

[0079] (1) Variable definition

[0080] φ: is the instantaneous phasor phase angle

[0081] X, x: instantaneous phasor magnitude

[0082] N: Number of sampling points per power frequency cycle

[0083] f s :Sampling frequency

[0084] (2) Estimation of the actual frequency f of the signal at the next sampling moment

[0085] Order T s =Δt, then:

[0086] f = ΔΦ 2 πΔt ...

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 provides a synchronous phasor measurement method based on a self-adoption variable window, which is used for the field of a synchronous phase measurement of a power system. When being variable, a signal frequency is measured in real time, and the signal frequency in the next sampling time is estimated. The method used by the invention is used for keeping a sampling frequency unchanged rather than adjusting the sampling frequency fs. A data length N belonging to current calculation can be automatically adjusted according to an estimation frequency, so as to keep N*Ts=T (Ts=1 / fs is a fixed sampling period, fs is the sampling frequency, T=1 / f is an actual signal period value, and f is a signal frequency). Thus, the error compensation precision is improved; the frequency estimation precision is greatly improved. The synchronous phasor measurement method provided by the invention is applicable to synchronous phasor measurement calculation and frequency calculation correction in a ship power system.

Description

technical field [0001] The invention relates to the field of synchronized phasor measurement, in particular to a synchronized phasor measurement method based on an adaptive variable window for a ship power system. Background technique [0002] Most of the existing phasor measurement algorithms are based on discrete Fourier transform (DFT). When the frequency deviation in the power grid is not large, DFT can give satisfactory results no matter the measurement of amplitude and phase. But when the frequency offset is large, the accuracy of phasor measurement will drop rapidly due to the spectrum leakage caused by asynchronous sampling. Contents of the invention [0003] The invention provides a synchronized phasor measurement method based on an adaptive variable window. Aiming at some shortcomings of the current phasor measurement algorithm, an improvement is made on this basis to improve the accuracy of error compensation and greatly improve the accuracy of frequency estimat...

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): G01R25/00G01R23/02
Inventor 夏立王黎明卜乐平邵英王征
Owner NAVAL UNIV OF ENG PLA
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