臺灣博碩士論文加值系統

本文主要利用輸出變壓器曲折繞接線(zig-zag transformer)及選擇諧波消除脈波寬度調變(Selective Harmonics Elimination PWM, SHE PWM)來控制三階層反流器系統。因輸出變壓器之特性，其脈波寬度調變波形被設計成四分之ㄧ對稱波形，該波形利用牛頓-瑞福森法(Newton-Raphson method)求開關之切換角度精確解曲線資料，再將曲線資料利用最小平方差法(Least Squares Solutions)來獲得曲線近似方程式。由於曲線近似化的優點能夠讓數位處理器做即時運算來控制基本波大小及改變系統頻率。最後，本文將實驗證明該系統。

This thesis applies the zig-zag transformer and the selective harmonics elimination PWM (SHEPWM) scheme to control a three-level inverter system. The PWM is designed to a quarter symmetry wave due the transformer’s characteristics. The wave applies the Newton-Raphson method to solve the exact curves, and then used the least squares solutions to obtain curve fitting equations. Due to the advantage property of curve fitting, the digital signal processor is able to control the fundamental value and change systematic frequency. Finally, experimental results confirm the system.

摘要 I
Abstract II
誌 謝 III
目錄 IV
圖索引 VII
表索引 XI


第一章 緒論 1
1.1 研究動機與目的 1
1.2 系統描述與研究方法 2
1.3 內容大綱 3
第二章 zig-zag繞線式變壓器與多階變流器 5
2.1 前言 5
2.2 zig-zag變壓器之架構與原理 [5] 6
2.3 多階層變流器的種類 8
2.3.1 二極體箝位型 10
2.3.2 電容器箝位型 11
2.3.3 分離式直流電源之多電池串聯型 13
第三章 脈波寬度調變策略與分析 15
3.1 前言 15
3.2 多階層脈波寬度調變策略的種類與選用 15
3.3 選擇諧波消除脈波寬度調變策略的原理 19
3.4 數值分析 24
3.5 曲線之方程式近似化 29
3.5.1 最小平方差方法 29
3.5.1 最小平方差之區段性選擇 40
第四章 硬體架構與軟體規劃 45
4.1 前言 45
4.2 硬體架構 45
4.2.1 數位訊號處理器(TMS320LF2407) 45
4.2.2 三階層變流器相關電路規劃 47
4.2.3 電壓感測電路 48
4.3 軟體規劃 49
4.3.1 程式輸出入腳位設定與中斷之規劃 49
4.3.2 整數運算的實現 51
4.3.3 回授電壓處理 52
4.3.4 程式流程介紹 53
第五章 模擬與實作 60
5.1 前言 60
5.2 zig-zag變壓器之輸出波形模擬與量測 61
5.3 電壓空間向量分析 76
第六章 結論與建議 80
參考文獻 82

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