本論文主旨在能夠透過載波交錯的方式以減少三階整流器的總輸入電流頻帶諧波，藉此以提升輸入電源的品質。本文的系統由兩組輸入並聯且輸出獨立的三階二極體箝位整流器所組成，並使用空間向量調變法，其總輸入電流頻帶諧波的大小會隨著兩整流器的振幅調變比、負載功率以及載波交錯角度而變化。文中依據兩整流器振幅調變比與負載功率之不同以離線方式求出能有最小總電流頻帶諧波之載波交錯角度。為減輕計算之負擔，本文僅選擇第一至第五的頻帶諧波群，每群也僅選擇其中振幅較明顯之頻帶諧波。
本論文使用MATLAB計算電流頻帶諧波優化角，並將計算的結果建立成一查表系統儲存於數位控制器，同時使用模擬軟體MATLAB/SIMULINK評估本文提出電流頻帶諧波優化方法的有效性。本文並建立一平台含有兩組輸入並聯且輸出獨立三階二極體箝位整流器，其輸入三相交流電壓220伏特、輸出直流電壓600伏特至1000伏特、最佳功率因數可達0.99的電路架構，文中使用數位信號處理器TMS320F28069作為數位控制器進行實測，並透過模擬與實測的結果，來驗證本論文的正確性及可行性。

The main purpose of this paper is to reduce the total input current sideband harmonics of the three-level diode clamped rectifiers through carrier interleaving, thereby improving the input power quality. The proposed system consists of two sets of three-level Switching-mode rectifiers, in which space vector modulation is used, with parallel ac inputs and independent dc outputs. It can be found that the total input current sideband harmonics will vary with the magnitude modulation indices of the two rectifiers, the load power, and the carrier interleaving angle. Thus, based on the different modulation indices of the two rectifiers and the load power, the carrier interleaving angle can use to mitigate the total current sideband harmonics. This study obtained a set of interleaving angle through offline calculation, and which promise better ac line power condition. In order to reduce the burden of calculation, this article only selects the first to fifth sideband harmonics groups, and each group only selects sideband harmonics with obvious amplitude.
In this paper, MATLAB is used to calculate the suitable angles of the current sideband harmonics. The calculated results are used to set up a look-up table and download to the digital controller. The simulation software MATLAB/SIMULINK is used to simulate the circuit to estimate the effectiveness of the proposed method. This paper also establishes a platform with two sets of three-level diode clamped rectifiers with independent output. The input AC voltage is 3phase/220 volts. the output DC voltage range is from 600 volts to 1000 volts. The power factor can reach 0.99. In this paper, the DSP TMS320F28069 is used as the digital controller for experimental, and the correctness and feasibility of this thesis are verified through the results of simulation and experimental results.

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