本論文旨在建立一以數位訊號處理器(Digital signal processor, DSP)為主之開關磁阻發電機(switched reluctance generator, SRG)系統，並從事其閉迴路控制研究。首先了解SRG之能量轉換原理及其主導方程式。接著探究SRG在操作及控制上之ㄧ些關鍵事務，包括激磁控制及電壓建立特性、線圈電流之脈寬調變(Pulse width modulated, PWM)切換控制特性、換相移位對於線圈電流控制及發電機操作之影響等。此外在發電模式下負值反電動勢導致線圈電流控制之不穩定也予以分析，並據此提出一含兩切換模式之電流PWM控制方法以得到較穩定之線圈電流控制。
為了從事性能測試，設計組立一以DSP為主之SRG系統，並以一些實測結果驗證所建立SRG系統之正常操作及性能。在電壓控制方面，在所選定之工作點估測發電機系統之正規動態模式。再應用此模式及依給定之電壓控制規格設計一迴授控制器及一線性模式追蹤控制器，使發電機系統在系統參數及工作點變動下仍具有所欲之電壓控制特性。為了降低直流鏈之電壓紋波，本論文提出一強健電壓紋波消除控制器，並以實驗結果驗證其有效性。最後，由一些實測結果進一步察知換相移位對SRG轉換效率、線圈電流追蹤軌跡及電壓動態響應有很大之影響。

The major purposes of this thesis are the establishment of a DSP-based switched-reluctance generator (SRG) and to perform its closed-loop control. First, the electromechanical energy conversion principle and the governing equations of a SRG are described. Then some practical issues in operation and control of SRG are studied. These issues include excitation control and voltage build up characteristics, winding current PWM switching control properties, the effects of commutation instant shift on the winding current control and generator operation, the possible closed-loop control configurations and strategies, etc. The instability of winding current control caused by negative back electromotive force (EMF) is analyzed. Then accordingly, the current control PWM scheme based on two switching modes is proposed to yield more stable winding current control.
For performing performance test, a DSP-based SRG system is established, and some measured results are provided to demonstrate its normal operation. In voltage control aspect, a nominal dynamic model of the established SRG system is first estimated form measurements. Then a feedback controller and a linear model following controller (LMFC) are designed to let the SRG system possess prescribed voltage control performance under varying system parameters and operating conditions. In order to reduce DC-bus voltage ripples, a simple robust voltage ripple cancellation (RVRC) control scheme is proposed. Finally, from the experimental observations it is found that the conversion efficiency, the winding current tracking trajectory and hence the voltage dynamic responses are much influenced by the commutation instant shift.

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