研究生: |
林冠宇 Kuan-yu Lin |
---|---|
論文名稱: |
獨立型太陽能發電系統用準Z源換流器之設計與研製 Design and Implementation of a Quasi Z-source Inverter for Stand-alone Photovoltaic Systems |
指導教授: |
劉益華
Yi-Hua Liu |
口試委員: |
王順忠
Shun-Chung Wang 鄧人豪 Jen-Hao Teng 劉添華 Tian-Hua Liu |
學位類別: |
碩士 Master |
系所名稱: |
電資學院 - 電機工程系 Department of Electrical Engineering |
論文出版年: | 2013 |
畢業學年度: | 101 |
語文別: | 中文 |
論文頁數: | 81 |
中文關鍵詞: | 準Z源換流器 、最大功率追蹤 、導通零態 、擾動觀察法 |
外文關鍵詞: | shoot-through duty ratio (Bduty), perturb and observe (P&O) method |
相關次數: | 點閱:284 下載:17 |
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本文實際研製一應用於單級式獨立型太陽能發電系統之準Z源換流器。準Z源換流器為Z源換流器之改良型架構,兩者皆只需單級轉換器便可同時實現升壓以及直流/交流轉換兩項功能,準Z源換流器並具備體積小、低成本與高可靠度等優點,因此適用於單級式獨立型太陽能發電系統。此外,準Z源換流器相較於Z源換流器,其元件額定值較低且輸入電流為連續。太陽能最大功率追蹤與穩定輸出電壓為獨立型太陽能發電系統中兩項最主要的功能,由於準Z源換流器具有兩個可控量(即導通零態的時間Bduty以及振幅調變比ma),因此本文提出一新型控制策略以同時完成太陽能最大功率追蹤與穩定輸出電壓等功能。本文完成之太陽能最大功率追蹤策略使用一般常用之擾動觀察法。此外,本文提出之導通零態的放置方式可減少功率開關於Bduty區間內所產生之熱。為了驗證所提出方法之正確性,本文設計一輸出電壓為 ,頻率為 ,功率為 之原型機。根據模擬與實驗量測結果,所設計之系統轉換效率均高於 ,而在所有測試條件下太陽能最大功率點追蹤準確度均高於 。此外本文提出之控制策略藉由調變Bduty與ma可同時達到最大功率追蹤與穩定輸出電壓等功能。
The design and implementation of a quasi-Z-source inverter (qZSI) for standalone photovoltaic generation systems (PGSs) is proposed in this thesis. The qZSI is derived from the traditional Z-source inverter, which can realize both DC voltage boost and DC-AC inversion simultaneously in a single stage. The advantages of using qZSI for standalone PGS include compactness, low cost, and higher reliability. In addition, qZSI offers several advantages over the ZSI, including lower component rating and continuous input current. For a standalone PGS, maximum power point tracking (MPPT) and stable output voltage are two main objectives of the system. However, there are two control variables, i.e. the shoot-through duty ratio (Bduty) and modulation index (ma), in a qZSI system. Therefore, a novel control scheme is also proposed in this paper to achieve both MPPT and voltage control in the same time. The MPPT method implemented in this thesis is a commonly utilized perturb and observe (P&O) method. In addition, a novel Bduty placement method is proposed to reduce the thermal stress of the power device. In order to validate the correctness of the proposed methods, a 110 VAC, 60 HZ, 500 W prototyping circuit is built. According to the simulation and experimental results, the measured conversion efficiency of the design system are all higher than 91 %, and the measured MPPT tracking accuracies are all higher than 97 % for all tested conditions. In addition, the proposed control scheme can regulate the shoot through duty ratio and the modulation index to achieve MPPT and maintain the output voltage magnitude simultaneously.
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