| The analysis of transient signal is the basement and foundation in fault detection as well as transient protection of the power system, and it is also applied widely in many fields of power system, such as dealing with the fault in time and prevent cataclysm in power system, power quality analysis, fault location and distance computation, apparatus status supervision and transient stability analysis etc.Wavelet theory is a new tool used in transient signal analysis, which is used to realize detecting and classifying electric power transient signal etc;The wavelet post-analysis meanings is formed by wavelet combined with the modal maximum extraction, statistics processing meanings, neural network,entropy computation, energy distribution etc, which applied in actual system more effectively such as electric power system detection lively,fault location and distance computation,relay protection etc. In this paper, a particular and characteristic virtual instrument system software of electric power transient signal is developed based on the application of wavelet theory and the pose-analysis meanings in electric power transient signal analysis.This paper adopts UML modal language to outline the specify function requirements of the wavelet analysis software. And the data acquisition module based on multi-thread technology is realized, which used the integration development environment of the National Instrument Corporation named LabWindows/CVI and the PCI-6143 data acquisition board,hardware configuration assistant,hardware drivers as well as many inner measure libraries; The different signal algorithms such as FFT,STFT,Continuous Wavelet Transformation,Discrete Wavelet Transformation and Wavelet Packet Transformation is complete which employed the abundant function libraries in CVI as follows: Mathematical and advanced signal analysis libraries as well as others; The software be able to computer the wavelet entropy and carry through the wavelet post-analysis utilized the results of the wavelet transformation; The traveling wave fault location and distance computation module based on the wavelet mould maximum is achieved; The distribute application module is fulfilled based on the TCP/IP network function and the self-extension industry protocol Modbus/TCP; At last, the software is tested strictly through cell testing and function testing to conclude that the software can run independently,stability,credibility and exactly, which shows that there is a wide prospect for applying the software to electric engineering running practice, with the addition of becoming the experiment platform of probing into the new relay protection principle and new protection devices, implementing the electric power system fault diagnosis and detecting online,fault location and distance computation and relay protection etc.
|
PDF Full Text Request