本文對多相多電平逆變器的峰-峰輸出電流紋波幅度進行了分析和討論。根據交流電壓分量計算電流紋波，并根據開關周期內電壓電平的電流斜率和應用次數定義峰峰值。給出了基波周期內峰-峰電流紋波分布隨調制指數變化的詳細解析表達式。在所有情況下，都參考了由基于載波或空間矢量PWM產生的中心對稱開關模式。通過這種PWM策略，以簡單有效的方式使直流母線利用率最大化，并得到一個近似最優的調制方式，使電流紋波均方根最小。從三相二電平逆變器輸出電流紋波的定義和分析入手，將理論擴展到多相逆變器，重點研究了五相和七相逆變器。針對由串聯RL阻抗和交流反電勢組成的一般平衡多相負載，引入了瞬時電流紋波。定義了輸出電流紋波最大值的簡化有效表達式。給出并討論了峰-峰電流紋波圖。通過仿真和實驗驗證了分析結果的正確性。輸出電流紋波的分析也擴展到多電平逆變器，特別是三相三電平逆變器。如前所述，最佳調制是根據電流紋波均方根最小化來確定的。此外，在這種情況下，對由串聯RL阻抗和交流反電動勢（RLE）組成的三相平衡系統進行了電流紋波分析，該系統代表了電機負載和并網應用。給出并討論了峰-峰電流紋波圖。此外，還進行了仿真和實驗，驗證了分析方法的有效性。對不同相數、不同電平的情況進行了比較，得出了一些有益的結論。并給出了一些應用實例。

Analysis of the peak-to-peak output currentripple amplitude for multiphase and multilevel inverters is presented anddiscussed in this PhD thesis. The current ripple is calculated on the basis ofthe alternating voltage component, and peak-to-peak value is defined by thecurrent slopes and application times of the voltage levels in a switchingperiod. Detailed analytical expressions of peak-to-peak current rippledistribution over a fundamental period are given as function of the modulationindex. For all the cases, reference is made to centered and symmetrical switchingpatterns, generated either by carrier-based or space vector PWM. By this PWMstrategy, the dc bus utilization is maximized in a simple and effective way,and a nearly-optimal modulation is obtained to minimize the current ripple RMS.Starting from the definition and the analysis of the output current ripple inthree-phase two-level inverters, the theoretical developments have beenextended to the case of multiphase inverters, with emphasis on the five- andseven-phase inverters. The instantaneous current ripple is introduced for ageneric balanced multiphase loads consisting of series RL impedance and ac backemf (RLE). Simplified and effective expressions to account for the maximum ofthe output current ripple have been defined. The peak-to-peak current ripplediagrams are presented and discussed. Both simulation and experimental resultsare carried out to prove the validity of the analytical developments. Theanalysis of the output current ripple has been extended also to multilevelinverters, specifically three-phase three-level inverters. The optimalmodulation has been identified with reference to current ripple RMS minimization,as in the previous cases. Also in this case, the current ripple analysis iscarried out for a balanced three-phase system consisting of series RL impedanceand ac back emf (RLE), representing both motor loads and gridconnectedapplications. The peak-to-peak current ripple diagrams are presented anddiscussed. In addition, simulation and experimental results are carried out toprove the validity of the analytical developments. The cases with differentphase numbers and with different number of levels are compared among them, andsome useful conclusions have been pointed out. Furthermore, some applicationexamples are given.

引言

三相二電平VSIs電流紋波分析

多相VSIs輸出電流紋波分析

多電平VSIs輸出電流紋波分析

峰峰值電流紋波比較

應用實例

結論與未來工作展望

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