Reliability modeling and redundancy design of hybrid MMC considering decoupled sub-module correlation
Reliability modeling and redundancy design of hybrid MMC considering decoupled sub-module correlation
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DOI：
10.1016/j.ijepes.2018.09.026
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发表时间：
2019-02
影响因子：
5.2
通讯作者：
Jianzhong Xu;Wang Le;Dongyi Wu;Hao Jing;Chengyong Zhao
中科院分区：
文献类型：
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作者：
Jianzhong Xu;Wang Le;Dongyi Wu;Hao Jing;Chengyong Zhao
传统的模块化多电平变流器可靠性分析模型很少考虑各子模块之间的相关性，这对系统冗余设计有不利影响。提出了一种考虑SM相关性的由半桥SM和全桥SM组成的混合MMC可靠性模型。首先，建立了HBSM和FBSM的SM相关性，包括可靠性模型。然后，基于Copula函数的坐标变换方法被用来解耦的SMs的相关性的混合MMC。基于拉格朗日乘子法，提出了一种基于等可靠性增量原理（ERIP）的最优SM冗余设计方案，以获得可靠性和投资成本的合理折衷。利用Matlab仿真验证了所提方法的可行性。
The conventional reliability analysis models of the modular multilevel converters (MMCs) rarely consider the correlations of all the sub-modules (SMs), which has negative impact on the system redundancy design. This paper proposes a reliability model for hybrid MMC composed of half-bridge SMs (HBSMs) and full-bridge SMs (FBSMs) considering the SM correlations. First the SM correlations included reliability models for both HBSM and FBSM are established. Then a Copula function-based coordinate transformation method is used to decouple the correlations of the SMs in hybrid MMC. Based on the Lagrange multiplier method, an equal reliability incremental principle (ERIP) based optimal SM redundancy design scheme is proposed to obtain a reasonable tradeoff between reliability and capital cost. The proposed approaches are validated to be feasible for practical HVDC system using Matlab.