Detection and Localization of Submodule Open-Circuit Failures for Modular Multilevel Converters With Single Ring Theorem
Detection and Localization of Submodule Open-Circuit Failures for Modular Multilevel Converters With Single Ring Theorem
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DOI：
10.1109/tpel.2018.2849441
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发表时间：
2019-04
影响因子：
6.7
通讯作者：
Weihao Zhou;Jing Sheng;Haoze Luo;Wuhua Li;Xiangning He
中科院分区：
文献类型：
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作者：
Weihao Zhou;Jing Sheng;Haoze Luo;Wuhua Li;Xiangning He
模块化多电平换流器由多个相同的子模块组成，子模块故障检测与定位是提高其可靠性的关键。在SM故障时，故障SM的电容器电压偏离健康SM的电容器电压。因此，SM电压一致性中断可以用作SM故障的指示器。为了有效地评估多个SM电压的一致性，单环定理，这是一个理想的分析工具，为大规模矩阵，应用于SM故障检测。建议SM故障检测方法消除了理想状态估计器的需要，从而确保足够的鲁棒性参数的不确定性。不需要额外的电压/电流传感器，这有利于成本效率。提出了一种基于概率分析的SM故障定位方法，能够在故障检测时快速识别出故障SM。该方法可以对单个和多个SM故障进行检测和定位，即使故障SM位于不同的臂中。通过MATLAB/Simulink仿真和13级MMC样机实验，验证了该方法的有效性。
Submodule (SM) failure detection and localization is crucial to reliability improvement of modular multilevel converters (MMCs), which consist of numerous identical SMs. Upon SM failures, the capacitor voltages of the faulty SMs deviate from those of the healthy SMs. Hence, SM voltage consistency disruption can be utilized as an indicator of SM failures. To enable effective consistency evaluation of numerous SM voltages, the single ring theorem, which is an ideal analyzing tool for large size matrices, is applied to SM failure detection in this paper. The proposed SM failure detection method eliminates the need for ideal-state estimators and thus ensures sufficient robustness in terms of parameter uncertainties. Additional voltage/current sensors are not required, which is beneficial for cost efficiency. A statistical-analysis-based SM failure localization method enabling fast identification of the faulty SMs upon failure detection is also proposed. Both single and multiple SM failure detection and localization can be handled with the proposed method even if the faulty SMs are in different arms. The effectiveness of the proposed SM failure diagnosis method is verified by both simulation in MATLAB/Simulink and experimentation on a 13-level MMC prototype.