- 學位論文
順滑模態技術應用於含轉子時間常數線上調適的無轉速感測器感應馬達間接式向量控制系統之研究
Sliding Mode Scheme for Sensorless Indirect Vector Control of Induction Motor Drives with Rotor Time Constant Online Tuning
摘要
本論文針對感應馬達間接式向量控制系統，提出一個無轉速感測器的系統架構。在文獻上，間接式向量控制中的同步磁場角度會受到馬達參數變動的影響。本論文採用一個轉子時間常數線上調適器和一個對參數變動具有強健性的滑模轉子磁通估測器。前者是用一個磁化電流估測器和一個轉子時間常數估測器所組成，當估測的電流誤差趨近於零時，估測的轉子時間常數就會趨近於實際的轉子時間常數。所提出的磁通估測器則是建立在一個順滑模態定子電流估測器的基礎上，當估測的電流誤差趨近於零時，轉子磁通即可直接由電流估測器的控制力積分得到。因此，在發生順滑模態時，估測的磁通並不需要使用馬達參數。換句話說，它對馬達參數具有不靈敏的特性。 本論文結合了上述的轉子時間常數線上調適器和滑模轉子磁通估測器與在參考文獻[18]中所提出的滑模電流控制策略，將他們應用在無轉速感測器的感應馬達速度驅動系統上。首先利用MATLAB /Simulink軟體進行模擬驗證所提出的控制策略，並實際組裝一組以個人電腦為基礎的實驗系統，來測試系統的各項特性。
並列摘要
A speed sensorless system is proposed for indirect vector control of induction motor drive. The synchronous flux angle used in indirect vector control are often sensitive to the motor parameters. In this thesis, a rotor time constant online tuner and a robust to parameters variations sliding mode observer are adopted. The former tuning scheme consists of a magnetic current observer and a rotor time constant observer. The estimated rotor time constant will approach to the actual rotor time constant when the estimated current error approaches zero. The proposed flux observer is based on a sliding mode stator current observer. Rotor flux is merely integrated from the control input of the current observer when the estimated current error approaches zero. In other words, the sliding mode observer is insensitive to motor parameters variations. Then, the aforementioned rotor time constant online tuning scheme and sliding mode rotor flux observer are combined with the sliding mode current controller proposed in [18] and apply to a speed sensorless induction motor drives. First, the proposed control scheme has simulated by MATLAB/Simulink toolbox to verify the feasibility of the proposed strategy. Finally, a PC-based experimental system is constructed to test the performances of the drive system.