本文旨在提出基於特定諧波消除技術之多階層電流源變頻器。其所需的凹陷角度解，是藉由規劃四分之一對稱波形並利用牛頓-瑞福森法(Nowton-Raphson method) 透過電腦之離線計算求得非線性聯立方程組之解。
多階層電流源變頻器包含兩部份：直流電流源部份及變頻器部份，並利用數位信號處理器(TMS320F2812)及複雜的可程式邏輯元件(ispMACH 4256V)將所求得之凹陷角度解儲存至控制器中，轉換成開關元件所需之切換訊號。
除數位控制器外，將含有輸出濾波器之三相五階層電流源變頻器進行測試與量測。本文亦建立模擬程式進行諧波分析用以驗證凹陷角度之正確性，最後經由模擬與實作結果證明了本文所提出的多階層電流源變頻器確實具可行性。

This thesis proposes a multi-level current source inverter based on selective harmonic elimination technique. The required notch angles are solved from a set of non-linear simultaneous equations which is established by quarter-waveform symmetric assumption. Newton- Raphson method is used to solve the non-linear simultaneous equations through off-line calculation in a personal computer .
Then, the solved notch angles are stored in a digital controller which employs a digital signal processor (TMS320F2812) and a complex programmable logic device (ispMACH 4256V). The multi-level current source inverter is consist of two stages: the dc current source stage and the inverter stage. The digital controller provides switching pattern for the switches in the two stages.
In addition to the digital controller, a three-phase five-level current source inverter with output filter is built for test and measurement. Moreover, a simulation program is built to confirm the correction of the notch angles solved by off-line calculation through the harmonic analysis. Both the simulation and experimental results shows the validity of the proposed multi-level current source inverter.

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