臺灣博碩士論文加值系統

本文提出一種新型的準Z源換流器（quasi-Z-source inverter , qZSI）之調變方法。所完成的準Z源換流器具有高可靠性、低元件和熱應力與輸入電流連續等特點，並且能夠以單級電路架構同時實現升壓和降壓功能與直流/交流轉換。根據準Z源換流器的特點，本文提出了改良型的準Z源正弦脈波寬度調變(qZSI sinusoidal pulse-width modulation, qZSPWM)方法，相較於一般的準Z源正弦脈波寬度調變將導通零態同時放置於兩臂開關，所提出的方法將導通零態以正負半週為分界，分別放置於左臂開關或右臂開關，此方法能有效的改善功率開關的切換損失與熱損耗的問題。為了進一步的改善轉換效率，本文亦採用相移導通零態調變法，此方法能減少功率元件的切換次數，因此能夠進一步降低開關切換損耗。
為了驗證所提出的方法，本文實際完成一交流輸出110V，頻率60 Hz，額定功率350 W之單級式準Z源換流器。根據實驗結果，所提出的調變策略之轉換效率高於88.5%，相較於傳統簡單升壓型控制( Simple boost control )調變方法，所提出的方法在同一負載下最高可改善效率達3.4%。

In this thesis, the design and implementation of a novel modulation strategy for Quasi-Z-source inverter (qZSI) is first presented. The developed qZSI features high compactness, low component and thermal stresses, continuous input current and can simultaneously carry out both DC voltage boost and DC-AC inversion. Based on the realized qZSI, a modified qZSI sinusoidal pulse-width modulation (qZSPWM) strategy is proposed. Instead of placing the shoot-through state in both inverter legs, the proposed method generates the shoot-through state only in left/right inverter leg during the positive/negative cycle, respectively. Using this way, the switching losses and thermal stress of the power devices can be reduced. To further improve the efficiency, a new shifted shoot-through state placement method is also studied. This method can reduce the switching numbers of power devices; hence further decrease the switching losses.
In order to validate the correctness of the proposed methods, a 110Vac, 60 Hz, 350 W prototyping circuit is built. According to the experimental results, the measured conversion efficiencies of the designed system are higher than 88.5 %. Comparing with conventional qZSI with simple-boost control, at the same loading condition, the proposed modulation technique can improve the maximum efficiency by 3.4 %.

摘要 I
Abstract
誌謝
目錄
圖目錄
表目錄
第一章 緒論
1.1研究背景與動機
1.2文獻探討
1.3研究目的
1.4論文大綱
第二章 Z源換流器之原理與控制策略
2.1橋式換流器介紹
2.1.1半橋式換流器介紹
2.1.2 全橋式換流器介紹
2.2單相Z源換流器介紹
2.3正弦脈波寬度調變
2.3.1 雙極性電壓PWM切換
2.3.2 單極性電壓PWM切換
2.3.3 盲時區間設置
2.4 Z源正弦脈波寬度調變
第三章 單級式準Z源換流器硬體架構設計
3.1準Z源換流器介紹
3.1.1準Z源換流器電路分析
3.1.2準Z源換流器之準Z阻抗參數設計
3.2緩振電路設計
3.3低通濾波器設計
3.4設計實例
第四章 單級式準Z源換流器韌體架構設計
4.1 dsPIC33FJ16GS502微處理器簡介
4.2程式設計流程介紹
4.3數位濾波器
4.3.1濾波器簡介
4.3.2 FIR與IIR濾波器
4.3.3 FIR濾波器
4.3.4 FIR濾波器設計
4.3.5 FIR數位濾波程式流程
4.3.6 FIR數位濾波器驗證
4.4 數位PID控制器
4.4.1數位PID控制器原理
4.4.2數位PID控制器實現
4.5 qZSPWM控制程式介紹
4.5.1 簡單升壓控制法
4.5.2 交換式導通零態調變
4.5.3 相移導通零態調變
4.5.4 交換式相移導通零態調變法
4.6 qZSPWM控制程式設計
第五章 實驗結果及討論
5.1控制訊號實測波形圖
5.1.1簡單升壓控制之訊號實測波形圖
5.1.2交換式導通零態調變之訊號實測波形圖
5.1.3交換式相移導通零態調變之訊號實測波形圖
5.2實際量測數據
第六章 結論與未來展望
6.1結論
6.2未來展望
參考文獻

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