臺灣博碩士論文加值系統

本論文旨在探討無量測器直接轉矩控制感應馬達驅動器的定子電阻參數辨識與轉矩漣波最小化問題，首先探討直接轉矩控制的各種變頻器切換式樣，接著介紹直接轉矩控制的原理並建立無量測器直接轉矩控制感應馬達驅動器的架構。進而提出以觀測有效功率為基礎的MRAS定子電阻辨識架構，來線上估測馬達定子電阻，以消除因溫升造成馬達定子電阻變動，造成控制器的定子電阻設定值無法與馬達定子電阻匹配，而影響到系統的穩定度問題。再者，切換表式直接轉矩控制架構因使用轉矩與定子磁通遲滯型控制器關係，會造成轉矩漣波問題，尤其以低速運轉時更是嚴重，因此，本文提出一個用以選擇非零電壓向量與零電壓向量切換瞬間的轉矩漣波最小化控制方法。經由模擬與實驗結果印證本文所提出結合定子電阻估測與轉矩漣波最小化的技術，可有效的改善無量測器直接轉矩控制驅動器的運轉性能。

A sensorless direct torque controlled induction motor drive with stator resistance identification and torque ripple minimization is presented in this thesis. First, A model reference adaptive system (MRAS) based scheme is used to identify stator resistance on-line. It is shown in the thesis that the proposed adaptive stator resistance strategy can effectively stabilize the direct torque control induction motor drive, when the set value of the stator resistance in the controllers is higher than that of the motor. Next, a torque ripple minimization scheme is proposed which selects the switching instants of the nonzero and zero voltage vectors in each sampling period in a predictive way. Both the simulation and experimental results show that the combined stator resistance estimation and torque ripple minimization techniques can effectively reduce the torque ripple at low speed down to 20 r/min under loading condition.

第一章 緒論 1
1.1 研究動機 1
1.2 研究背景與目的 4
1.3 內容大綱 5
第二章 直接轉矩控制的變頻器切換式樣 6
2.1 切換表操作方式 6
2.2 直接自我控制(DSC)操作方式 16
2.3 電壓空間向量調變的操作方式 19
第三章 無量測器直接轉矩控制感應馬達驅動器 30
3.1 轉矩與磁通計算法則 30
3.2 感應馬達直接轉矩控制的速度估測 32
3.3 感應馬達之電壓空間向量式直接轉矩控制 34
3.4 直接轉矩控制感應馬達驅動器的模擬 37
3.4.1 切換表式直接轉矩控制感應驅動系統模擬 37
3.4.2 空間向量調變式直接轉矩控制系統模擬 44
第四章 直接轉矩控制之馬達參數線上調適 51
4.1 MRAS定子電阻辨識的原理 55
4.2 MRAS定子電阻辨識的穩定性分析 57
4.2.1 轉換MRAS估測系統為等效非線性時變回授系統 57
4.2.2 證明線性非時變前向子系統的轉移函數矩陣為嚴
格正實數矩陣 60
4.2.3 求能滿足Popov’s積分不等式之非線性時變回授
子系統的調適機構 62
4.2.4 MRAS辨識架構的穩定性 63
4.3 由轉子磁通觀測器以MRAS來辨識定子電阻 65
4.4 具有MRAS定子電阻估測之無量測器DTC系統的模擬 68
4.4.1 定子電阻變動對直接轉矩控制系統的影響 69
4.4.2 以有效功率為基礎的MRAS定子電阻辨識DTC
系統模擬 73
4.4.3 以電抗功率為基礎的MRAS定子電阻辨識DTC
系統模擬 77
第五章 直接轉矩控制之轉矩漣波最小化 82
5.1 減少轉矩漣波的方法 82
5.2 轉矩漣波最小化原理 84
5.3 具有轉矩漣波最小化直接轉矩控制系統的模擬 88
第六章 具有定子電阻調適與轉矩漣波最小化之無量測器直接
轉矩控制感應馬達驅動器的實現 96
6.1 實驗系統介紹 96
6.1.1 PC-based 控制板 96
6.1.2 功率級板 102
6.2 模擬與實驗結果 104
6.2.1 DTC控制迴路的定子電阻設定值不匹配時所引起
不穩定度的模擬 104
6.2.2 適應性DTC對轉矩漣波最小化的模擬 105
6.2.3 具有適應性DTC對轉速命令四象限操作的模擬與
實驗 105
6.2.4 適應性DTC在低轉速的實驗 106
第七章 結論與建議 112
7.1 結論 112
7.2 建議與後續研究方向 113
參考文獻 115
作者簡介 131

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