風力發電機之出力受發電機端電壓影響甚鉅，對於轉子側短路的鼠籠式風力發電機(Squirrel-Cage Induction Generators, SCIG)更是如此，因此其低電壓穿越能力(Low Voltage Ride Through, LVRT)成為了設計風力發電廠時重要的指標項目之一。
本文利用閘切串聯電阻(Thyristor Switched Series Resistor, TSSR)在電網發生故障時提升風力發電廠的端電壓，以其串聯電阻吸收過剩的實功進而提高風力發電廠的低電壓穿越能力。此外，針對串聯電阻值的設計，同時考慮了暫態穩定度與小訊號穩定度的需求，選擇出適當大小的串聯電阻值，將閘切串聯電阻對系統的衝擊降到最低。
本文以MATLABR/SIMULINK/SimPowerSystems進行分析模擬與驗證。理論分析與模擬結果顯示，閘切串聯電阻能夠大幅提高鼠籠式風力發電機的低電壓穿越能力，且其有控制簡單與價格經濟的優點，對於改善系統較弱的偏遠地區之風力發電機是相當可行的補償方式，也可直接應用於其他現有之風力發電廠。

Series resistors can be used to improve generator voltage dip due to a fault in the grid and enhance generator fault ride-through (FRT) or low voltage ride-through (LVRT) capability. To determine proper values for the inserted series resistance, transient stability analysis and small signal stability analysis are performed on squirrel-cage induction generators connected to the grid through a weak tie. Stable regions for transient stability and small signal stability were plotted. It is concluded from the results from stability analyses that different values of series resistors should be used for different fault voltages in order to ensure wind farm stability. To achieve the goal of variable series resistances under different fault voltages, a thyristor switched series resistor (TSSR) which comprises four thyristor switched resistors connected in series is proposed in this paper. Control laws for the TSSR are derived. Simulation results indicate that generator terminal voltage and electromagnetic torque are raised under various fault events and the LVRT capability is improved by using the proposed TSSR.

致謝 II
摘要 IV
ABSTRACT V
目錄 VI
圖目錄 VIII
表目錄 XII
第一章 緒論 1
1.1 研究背景 1
1.2 文獻回顧 3
1.3 研究方法與目的 7
1.4 論文內容概述 8
第二章 風力感應發電機基礎理論分析 9
2.1 風力發電原理 9
2.2 風力發電機之種類 14
2.3 感應發電機數學模型 17
2.4 風力發電機低電壓穿越特性 19
第三章 動態串聯電阻工作原理 23
3.1 系統架構與參數 23
3.2 動態串聯電阻對低電壓穿越之影響 24
3.3 動態串聯電阻值大小選擇 27
3.3.1前言 27
3.3.2暫態穩定度分析方法 29
3.3.3小訊號穩定度分析方法 30
3.4 可調變之動態串聯電阻 34
3.5 動態串聯電阻之極限 35
第四章 閘切串聯電阻分析 37
4.1 閘切串聯電阻之架構與控制 37
4.2 模擬結果與分析 40
4.2.1無補償之模擬結果 40
4.2.2有補償而不穩定之模擬結果 42
4.2.3有補償而穩定之模擬結果 46
4.2.4加裝閘切串聯電阻之低電壓穿越特性 58
4.2.5加裝閘切串聯電阻之動態特性分析 58
第五章 結論與未來研究方向 65
5.1 結論 65
5.2 未來研究方向 66
參考文獻 69

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