在近幾年以來,三電平NPC逆變器被認為是高功耗負載（例如不同電動汽車中的電動機等）的適當應(yīng)用。三級逆變器屬于多級逆變器拓撲,它與兩級逆變器有很大的差異,可以認為是兩級逆變器的擴展。由于與兩級拓撲多電平逆變器相比,工作電壓范圍更大,因此可提供更好的輸出特性。通常它們的輸出信號更接近正弦波形。由于電壓范圍的變化,多電平逆變器存在電壓不穩(wěn)定問題。這是這類設(shè)備的主要問題。解決這些問題的一種方法是將其他部分集成到拓撲中,另一種方法是顯著更改拓撲。第一種方法可能更容易接受,因為包含在拓撲中的零件數(shù)量較少。此調(diào)查由幾個部分組成,因此可以區(qū)分幾個部分組。第一部分包括:現(xiàn)有的三級逆變器拓撲,三級三相NPC逆變器的建議和數(shù)學(xué)模型,對現(xiàn)有三級逆變器控制策略的全面綜述。第二個步驟包括:定義各種電路參數(shù)對三級NPC逆變器工作流程的影響。最后一組致力于中性點電壓穩(wěn)定和減少波動的硬件解決方案的分析。 

【文章來源】：哈爾濱工業(yè)大學(xué)黑龍江省 211工程院校 985工程院校

【文章頁數(shù)】：64 頁

【學(xué)位級別】：碩士

【文章目錄】：
摘要
Abstract
Chapter1 Introduction
    1.1 Source of the subject and background and significance of the study
    1.2 Research background and significance
    1.3 Analysis of literature review
        1.3.1 Neutral point potential as main drawback of three-level NPC inverters
        1.3.2 Comparison of main inverter topologies
        1.3.3 Analysis of literature review
    1.4 Content and methodology of the research
Chapter2 Mathematical modeling of three level voltage source inverter
    2.1 Mathematical model
    2.2 Mathematical modeling of space vector PWM controller for the 3 level VSI
        2.2.1 Main principle of space vector PWM
        2.2.2 Mathematical implementation of the SVPWM algorithm
        2.2.3 Mathematical modeling output signal of the SVPWM controlled inverter under the balanced and the unbalanced load
    2.3 Mathematical modeling of sinusoidal PWM controller for the3 level VSI
        2.3.1 Main principle of sinusoidal PWM
        2.3.2 Mathematical modeling output signal of the SPWM controlled inverter under the constant and the unbalanced load
    2.4 Chapter conclusion
Chapter3 The influence of variable circuit parameters on the output signal waveform and neutral point voltage balance
    3.1 The experiment conditions short description
    3.2 The influence of the capacity of neutral point capacitors
    3.3 The influence of the series resistance of neutral point capacitors
    3.4 The influence of the parallel resistance of neutral point capacitors
        3.4.1 Analysis of the experimental data
    3.5 Chapter conclusion
Chapter4 Analysis hardware method of neutral point voltage stabilization efficiency
    4.1 Midpoint potential balance hardware circuit workflow description
    4.2 Algorithm description
    4.3 Analysis of duty cycle length influence on midpoint potential balance hardware circuit capacitor voltage stabilization speed
    4.4 The analysis of the PID controller influence midpoint potential balance hardware circuit capacitor voltage stabilization speed
    4.5 The influence of the inductance to the voltage stabilization process
    4.6 The analysis of the mathematical modelling results
Conclusion
References
Acknowledge
Appendix



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