采用子模块相关性坐标变换解耦的混合模块化多电平换流器可靠性建模  

Reliability Modeling of Hybrid Modular Multilevel Converter Using Coordinate Transformation Based on Decoupled Sub-Module Correlations

作　　者：许建中[1] 王乐[1] 武董一 井皓 赵成勇[1] Xu Jianzhong;Wang Le;Wu Dongyi;Jing Hao;Zhao Chengyong(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University,Beijing 102206 China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学)

出　　处：《电工技术学报》2019年第18期3821-3830,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51607065);中央高校科研业务费专项资金(2017MS002)资助项目

摘　　要：传统模块化多电平换流器(MMC)可靠性分析的方法大多仅针对半桥MMC或忽略各子模块(SM)间的相关性。本文针对具有工程应用前景的混合MMC,提出了一种子模块相关性坐标变换解耦的混合MMC可靠性分析方法。首先,建立单一子模块可靠性模型。其次,基于Copula理论提出一种MMC可靠性分析坐标变换解耦的新方法。然后,遵循坐标变换前后子模块串联系统可靠性不变的原则,推导半桥MMC和全桥MMC的坐标变换和可靠性计算公式,并将其推广到混合MMC。通过坐标变换实现子模块串联系统各子模块相关性的解耦,可以采用古典概型方法对混合MMC的可靠性进行评估。最后,通过在Matlab中编程计算验证了所提出的混合MMC坐标变换和可靠性计算方法的有效性。The traditional reliability analysis methods of the modular multilevel converter (MMC) either focused on half-bridge MMC only or ignored the sub-module (SM) correlations. As one of the potential candidates in future HVDC systems, this paper proposes the decoupled SM correlations-based reliability modelling approach for the half- and full-bridge hybrid MMC. Firstly the reliability model for the individual SM is established. Secondly a Copula function-based coordinate transformation is employed. According to the principle that the reliability of the series system among all the SMs is constant before and after coordinate transformation, the formulas of the coordinate transformations for half- and full-bridge MMCs are proposed respectively and further the corresponding formulas for hybrid MMC are deduced. After the transformation, the correlations among the SMs are decoupled so that the classical probability models can be applied. Finally, the calculations in Matlab have verified the feasibility of the proposed approaches. Finally, the calculations in Matlab have verified the feasibility of the proposed approaches.

关 键 词：模块化多电平换流器 混合 MMC 子模块相关性解耦 可靠性分析 坐标变换 

分 类 号：TM46[电气工程—电器]