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Research of Voltage Flicker Algorithm and Software Development Based on Virtual Instrument

Author: ChenYuYang
Tutor: ShangQiuFeng；YaoGuoZhen
School: North China Electric Power University
Course: Circuits and Systems
Keywords: Voltage flicker LabWindows / CVI MATLAB Wavelet transform Mixed programming
CLC: TM769
Type: Master's thesis
Year: 2011
Downloads: 63
Quote: 0
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Abstract


Voltage flicker is an important indicator to measure power quality , accurate measurement has a very important practical significance . This paper briefly introduces the research dynamic voltage flicker and a variety of methods of measurement , and a comprehensive comparison of the various methods of measurement , on this basis , the option of using the wavelet analysis to extract the voltage flicker characteristic parameters of the envelope signal . Due to the diversity of wavelet function , for the same problem using different wavelet bases analysis will get different results of the analysis , in practical engineering applications , the optimal selection of the wavelet function is a difficult , but also the subject of one of the research . After a comparative analysis of the characteristics of a variety of commonly used wavelet family , select three wavelet function to simulate and analyze the presence of Mallat fast algorithm , orthogonal , discrete wavelet transform features . Designed and implemented the voltage flicker wavelet analysis software in the LabWindows / CVI environment . LabWindows / CVI and MATLAB mixed programming in the software design process through a method called dynamic link library to call MATLAB wavelet toolbox functions , both to enhance the efficiency of the development of the Virtual Instrument Software provides scalability ; free , lightweight powerful open-source the database SQLite3 storage data , further reducing the system's memory overhead and economic expenses . The development of the system software has a user login authentication , data access , and delete files long-distance transmission , print statements . Experimental results show that the wavelet transform theory because of its excellent multi-resolution analysis features to extract the characteristic parameters of voltage flicker envelope signal . Has the advantages of high efficiency, short development cycle, and to facilitate the secondary development of software based on virtual instrument development .

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system automation > Computer application in power system
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