臺灣博碩士論文加值系統

本文提出一種新型計算方法，以瞬時電壓向量，配合小波轉換進行降頻取樣，計算出電壓閃爍成份及電壓閃爍值。此法可改善間接解調法中閃爍頻率衰減的問題，減少誤差。文中以小波信號分解做為降頻取樣方法，可以達到濾除諧波與減少計算點數雙重效果，與跳點取樣法比較，可改善因諧波所造成的誤差。本文除了以測試波形做分析外，也利用鋼鐵廠實測資料做驗證，希望此方法能具實用性之價值。

This paper proposes a new method by using the instantaneous voltage vector and the wavelet transform for down sampling to calculate voltage flicker components. The new method can improve calculation errors of modulation components in the indirect modulation method. The signal decomposition by wavelet transform is a down sampling method which have the effect of filtering off harmonic components and reducing data points. Compared with the method of skipping over points, it can reduce the error caused by harmonics. Not only given waveforms but field measured waveforms of steel plant are verified to calculate voltage flicker values. The new method of voltage flicker calculation is hoped to have merits with practicability.

中文摘要………………………………………………… i
英文摘要………………………………………………… ii
誌謝……………………………………………………… iii
圖表索引………………………………………………… vi
第一章 緒論
1.1研究動機與背景……………………………………… 1
1.2研究目的……………………………………………… 2
1.3章節概述……………………………………………… 3
第二章 電壓閃爍
2.1電壓閃爍簡介………………………………………… 5
2.2電壓閃爍管制標準…………………………………… 6
第三章 離散傅立葉轉換的應用
3.1快速傅立葉轉換……………………………………… 8
3.2任意因子之快速傅立葉轉換………………………… 12
3.3洩漏效應……………………………………………… 13
3.4智慧型離散傅立葉轉換……………………………… 16
第四章 小波轉換與FIR濾波器設計
4.1 離散小波轉換簡介…………………………………… 23
4.2 小波轉換的分解與重建……………………………… 26
4.3 利用小波轉換分解電壓閃爍與諧波波形…………… 28
4.4 FIR濾波器設計……………………………………… 34
第五章 電壓閃爍計算方法
5.1直接解調法…………………………………………… 40
5.2間接解調法…………………………………………… 41
5.3瞬時電壓向量法……………………………………… 50
5.4利用瞬時電壓向量計算電壓閃爍流程……………… 56
第六章 電壓閃爍計算結果
6.1電壓閃爍波形………………………………………… 60
6.2降頻取樣法的影響…………………………………… 61
6.3不同濾波器係數及頻率飄移的影響………………… 66
6.4實測資料計算結果…………………………………… 75
第七章 結論
7.1 總結…………………………………………………… 80
7.2 未來研究方向………………………………………… 81
參考文獻…………………………………………………… 82

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