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

doi:10.19595/j.cnki.1000-6753.tces.181181

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Abstract 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.

Key words： Modular multilevel converter (MMC) hybrid MMC decoupled sub-module correlation reliability analysis coordinate transformation

Received: 09 July 2018 Published: 26 September 2019

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TM46

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	Xu Jianzhong
	Wang Le
	Wu Dongyi
	Jing Hao
	Zhao Chengyong

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Xu Jianzhong,Wang Le,Wu Dongyi等. Reliability Modeling of Hybrid Modular Multilevel Converter Using Coordinate Transformation Based on Decoupled Sub-Module Correlations[J]. Transactions of China Electrotechnical Society, 2019, 34(18): 3821-3830.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.181181 OR https://dgjsxb.ces-transaction.com/EN/Y2019/V34/I18/3821

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