【摘要】：柔性直流輸電技術(shù)以其有功無功獨立控制,沒有換相失敗等優(yōu)點,在未來的直流輸電場合展示出更加廣闊的應(yīng)用前景。柔性直流輸電技術(shù)在近幾年得到了快速發(fā)展,其中,混合型多電平換流器以其具有直流故障自關(guān)斷能力和良好的經(jīng)濟性,在柔性直流輸電領(lǐng)域得到深入研究。換流器可靠性分析是混合型多電平換流器一個重要研究點,也是混合型多電平換流器模塊最優(yōu)冗余配置的重要參考因素之一。針對上述問題,論文將分別從古典概型角度和分布函數(shù)角度對混合型多電平換流器的可靠性加以分析。首先對混合型多電平換流器的概念及分類方法加以闡述,即混合型多電平換流器包括混合模塊化多電平換流器(Hybrid Modular Multilevel Converter,Hybrid MMC)、橋臂交替導(dǎo)通換流器(Alternate Arm C onverter,AAC)和混合級聯(lián)多電平換流(Hybrid Cascaded Multilevel Converter,HCMC),并展示上述三種換流器的拓撲,進一步結(jié)合拓撲分析其穩(wěn)態(tài)工作原理和暫態(tài)閉鎖原理,并據(jù)此設(shè)計模塊初始配置數(shù)目。然后從古典概型的角度,假設(shè)各子模塊的可靠性保持不變,且模塊間相互獨立,建立可靠性分析模型,依次分析混合模塊化多電平換流器中不同類型子模塊的冗余數(shù)目配置對換流器可靠性的影響,橋臂交替導(dǎo)通換流器中的導(dǎo)通開關(guān)模塊和整形電路子模塊不同冗余配置數(shù)目對換流器可靠性的影響,混合級聯(lián)多電平換流器中的導(dǎo)通開關(guān)模塊和整形電路子模塊對換流器可靠性的影響。在可靠性分析的基礎(chǔ)上,分析器件的有效利用率以衡量經(jīng)濟性,設(shè)計三種換流器的最優(yōu)冗余配置并加以對比,為實際工程的冗余配置提供參考和借鑒。最后,從分布函數(shù)的角度,假設(shè)各子模塊的可靠性隨時間變化,且考慮了子模塊間的相關(guān)性,并以混合型多電平換流器中的混合MMC為例,基于Copula理論和Copula函數(shù)建立可靠性模型,分析子模塊間的相關(guān)程度和冗余配置對換流器可靠性的影響。
[Abstract]:Flexible HVDC technology has the advantages of independent control of active power and reactive power and no commutation failure, so it has a wider application prospect in the future HVDC transmission field. Flexible DC transmission technology has been developed rapidly in recent years, in which hybrid multi-level converter has been deeply studied in the field of HVDC transmission due to its DC fault self-switching ability and good economy. Reliability analysis of converter is an important research point of hybrid multi-level converter, and it is also one of the important reference factors for optimal redundancy configuration of hybrid multi-level converter module. In order to solve these problems, the reliability of hybrid multi-level converter is analyzed in terms of classical probability and distribution function. Firstly, the concept and classification method of hybrid multilevel converter are described. That is, hybrid multilevel converter includes hybrid modular multilevel converter (Hybrid Modular Multilevel Converter,Hybrid MMC), bridge arm alternating conduction converter (Alternate Arm Converter,. (AAC) and hybrid cascade multilevel converter (Hybrid Cascaded Multilevel Converter,HCMC), and show the topology of the above three converters, and further analyze the steady-state working principle and transient locking principle, and then design the initial configuration number of modules according to the topology. Then from the classical probability point of view, assuming that the reliability of each sub-module remains the same, and the modules are independent of each other, a reliability analysis model is established. The influence of redundant number of different types of sub-modules on the reliability of hybrid modular multilevel converter is analyzed in turn. The effect of the number of redundant configurations of the on-switch module and the shaping circuit sub-module on the reliability of the converter in the bridge-arm alternating conduction converter. The effect of on-switch module and shaping circuit sub-module on the reliability of hybrid cascade multilevel converter. On the basis of reliability analysis, this paper analyzes the effective utilization ratio of the devices to measure the economy, designs and compares the optimal redundancy configuration of the three converters, and provides reference and reference for the practical engineering redundancy configuration. Finally, from the point of view of distribution function, the reliability of each sub-module is assumed to vary with time, and the correlation between sub-modules is considered. Taking the hybrid MMC in hybrid multilevel converter as an example, the reliability model is established based on Copula theory and Copula function. The influence of the correlation degree and redundancy configuration among sub-modules on the reliability of converter is analyzed.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM46

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