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Design and Research of Virtual Harmonic Analysis System Based on FFT and Wavelet Transform

Author: WuJian
Tutor: LiBaJin
School: Inner Mongolia University of Technology
Course: Power Electronics and Power Drives
Keywords: Virtual instrument LabVIEW Harmonic Analysis FFT Wavelet Transform Transient signal
CLC: TP391.9
Type: Master's thesis
Year: 2009
Downloads: 315
Quote: 3
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Abstract


With the development of modern power electronics technology , more and more widespread application of nonlinear power load in the power system the resulting harmonic power to the grid caused increasingly serious pollution , harmonic power quality has become a public nuisance . Therefore , monitoring and research is the harmonic limit and eliminate harmonics hazards of the premise is also an urgent need to ensure the economic operation of power supply system security and ensure that equipment and personal safety . Traditional harmonic parameter detection system hardware as the core function of a single , gradually unable to meet the increasingly complex test requirements . In recent years , computer technology, communication technology , as well as test and measurement technology development to promote the virtual instrument technology advances , the virtual instrument technology into the power system has an extremely broad application prospects . This article first departure from the power system harmonic analysis of its causes harm and traditional harmonic measurement method and its advantages and disadvantages , the virtual instrument technology and harmonic analysis of the theoretical basis , and then based on FFT and Wavelet Transform virtual design ideas of harmonic analysis system and its implementation. The data acquisition is the first to solve the problem in the virtual instrument system , developed in LabVIEW LabVIEW driver is based on the dynamic link library , control and data acquisition card hardware sampling data transmission . Analysis of some of the key indicators of measurement algorithm . Focus on the completion of the harmonic analysis method for real-time analysis of steady-state harmonic FFT algorithm , transient signal is part of the wavelet transform Mallat algorithm to identify mutations harmonic and positioning . The paper develops a virtual harmonic analysis system based on FFT and wavelet transform , completed the design of a development platform with the hardware connection and software modules . The test system voltage and current data real-time acquisition parameters through the background software systems to calculate indicators , and has a friendly interface and data storage capabilities , and has extensive expansion and upgrading of space . Prove its performance indicators to meet the needs of harmonic measurement and analysis through simulation and actual measurement .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Computer simulation
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