本論文之主要目的在研究雙饋式感應風力發電機與配電系統之併聯運轉。文中利用背對背之兩組變流器控制雙饋式感應發電機之工作特性，主要研究內容有兩點，第一為研究電力系統之變動對風力發電機的影響；第二為研究不同風速下風力發電機之最大功率追蹤。

首先針對風力機之特性及雙饋式感應發電機之特性進行分析，其次建立控制方塊圖，再利用脈波寬度調變技術搭配 PI控制器控制背對背變流器，以使雙饋式感應風力發電機同時具備穩定定子端電壓及輸出最大功率之能力。

模擬方面使用MATLAB○R/Simulink/SimPowerSystems軟體模擬整個系統。本論文將模擬出負載變動及風速變動下，雙饋式感應發電機之動態特性。

Dynamic performance of a doubly-fed induction generator(DFIG) connected to a distribution system is investigated in this thesis using a back-to-back converter tocontrol the doubly-fed induction generator. Two major topics are covered in this
study. One is the effect of a disturbance in the power system on the dynamicperformance of the DFIG. The other is the maximum power point tracking(MPPT) ofthe DFIG under different wind speeds.

The characteristics of wind turbine and doubly-fed induction generator are first studied. Then the control block diagram for the DFIG is established. The real andreactive power outputs of the DFIG are controlled by a back-to back converter using aPI controller and the pulse width modulation(PWM) technology.

Dynamic simulations for the system subject to disturbances such as load changes
and wind speed variations are conducted MATLAB○R/Simulink/SimPowerSystems. It is concluded from the simulation results that stator voltage can be effectively regulated and maximum power can be extracted from the wind turbine by theproposed DFIGcontroller.

致謝.................................i
摘要...................................ii
Abstract...............................iii
目錄..................................iv
圖目錄.................................vi
表目錄...............................viii
第一章 緒論............................1
1.1 研究背景............................1
1.2 文獻回顧............................1
1.3 研究方法與目的.........................2
1.4 論文內容介紹..........................2
第二章 基礎理論分析........................4
2.1 前言..............................4
2.2 電壓補償器原理.........................5
2.2.1 電壓穩定度........................6
2.2.2 電壓支撐.........................8
2.3 風力發電機最大功率追蹤.....................9
2.3.1 風力功率曲線.....................10
2.3.2 最大功率曲線.....................11
2.4 脈波寬度調變切換技術.......................11
2.4.1 弦式脈波寬度調變控制器...................12
2.4.2 變流器切換頻率之分析....................14
第三章 系統側變流器(GSI)分析....................15
3.1 前言............................15
3.2 同步旋轉座標轉換法.....................15
3.3 系統側變流器之控制.....................17
3.3.1 數學模型建立.....................17
3.3.2 系統側變流器控制方塊圖...................18
第四章 轉子側變流器(RSI)分析....................22
4.1 前言............................22
4.2 定子磁通導向(SFO)分析.....................22
4.3 風機最佳動態曲線......................24
4.4 轉子側變流器之控制.....................25
4.4.1 數學模型建立.....................25
4.4.2 轉子側變流器控制方塊圖...................27
4.5 向量關係.............................29
4.5.1 補償端電壓導向與定子磁通導向關係..............29
4.5.2 轉子電氣轉速與定子磁通導向關係............30
第五章 模擬結果與分析.....................31
5.1 前言............................31
5.2 模擬系統描述........................31
5.2.1 電壓等級及電流與功率流向定義................32
5.2.2 風機參數..........................33
5.2.3 感應發電機參數.......................33
5.2.4 系統線路元件參數......................34
5.3 負載變動模擬........................34
5.4 最大功率追蹤模擬......................41
5.4.1 操作點模擬.........................41
5.4.2 低風速至高風速之模擬結果...............42
5.4.3 高風速至低風速之模擬結果...............49
5.4.4 總諧波失真量.....................56
5.4.5 風速變動模擬結果討論....................57
第六章 結論.............................60
6.1 結論............................60
6.2 未來研究方向........................61
參考文獻...............................62
作者簡介...............................64

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