In the reliable and smooth operation of power system,power quality matters a lot along with quantity.Different procedures and methodologies have been adopted nationally and internationally to improve the power quality and to continue the proper operation of power system.Harmonics is a primitive issue in power quality and it needs special consideration.Most of the time,it creates annoying scenario which causes malfunctioning of some sensitive electrical equipment in power system.The mentioned iss... 

【文章來源】：華北電力大學(北京)北京市 211工程院校 教育部直屬院校

【文章頁數(shù)】：64 頁

【學位級別】：碩士

【文章目錄】：
Abstract
Acronyms and Abbreviations
Chapter 1 Introduction
    1.1 Background and Significance
    1.2 Review of Literature and Relevant Research
        1.2.1 Fourier Transform
        1.2.2 Discrete Fourier Transform(DFT)
        1.2.3 Stationary and Non Stationary Signals With FT
        1.2.4 Short Time Fourier Transform(STFT)
    1.3 Thesis Organization
Chapter 2 Methods to Analyze Harmonics
    2.1 The Fundamental Theory Wavelet Transform(WT)
    2.2 Continuous Wavelet Transform
        2.2.1 Discrete Wavelet Transform
        2.2.2 Mother Wavelet
        2.2.3 Harmonic analysis using Wavelet Transformation
        2.2.4 Translation
        2.2.5 Window sized "f" and "t" Resolution
    2.3 Comparison of Wavelet Transform and Fourier Transform
        2.3.1 Advantages of Wavelet Transform
    2.4 summary of this chapter
Chapter 3 Research on Relation between Harmonics and Temperature-rise
    3.1 Load Loss of Transformer due to Harmonics
        3.1.1 Transformer Total loss under Harmonic Condition
        3.1.2 Effect of Harmonics On transformers
        3.1.3 Effect of Voltage Harmonics
        3.1.4 Effect of current Harmonics
    3.2 No Load Loss of Transformer due tp harmonics
    3.3 Tempreature rise due to Harmonics
    3.4 Eddy-Current loss
    3.5 Other Stray loss
    3.6 THD
    3.7 TIF
    3.8 TDD
    3.9 K-Factor
    3.10 Reviewing Distribution Transformation losses and derating definitions
    3.11 Effects of Voltage Harmonic losses and Temperature rise in distribution Transformer
    3.12 Effect of Ambient Temperatures on Transformers
    3.13 Transformer Thermal Dynamic Model
    3.14 Summary of This Chapter
Chapter 4 Research on Relation between Harmonics and Life Estimation
    4.1 Fundamental theory of Life estimation of transforms
    4.2 Effect of Harmonics on Transformers Loss of life
    4.3 Summary of this chapter
Chapter 5 Simulation Analysis
    5.1 Introduction
    5.2 Data Evaluation
        5.2.1 Data Collection Method
    5.3 Mexican Hat
    5.4 Signal Analysis
    5.5 Power Loss and Decay in Life
    5.6 Summary of this chapter
Chapter 6 Conclusion and Future Work
    6.1 Conclusion
    6.2 Future Work
REFERENCES
PUBLISHED ARTICLES
ACKNOOWLEDGEMENT
ABOUT THE AUTHOR



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