TY - JOUR
T1 - Isolation Forest Based Submodule Open-Circuit Fault Localization Method for Modular Multilevel Converters
AU - Deng, Fujin
AU - Chen, Yufei
AU - Dou, Jingming
AU - Liu, Chengkai
AU - Chen, Zhe
AU - Blaabjerg, Frede
PY - 2023/3
Y1 - 2023/3
N2 - Fault localization is one of the most important issues for modular multilevel converters (MMCs) consisting of numerous switches. This article proposes an isolation forest (IF) based submodule (SM) switch open-circuit fault localization method for MMCs. Based on the continuous sampling SM capacitor voltages, a number of isolation trees (ITs) are produced to construct the IFs for MMCs. Through the comparison of continuous IFs’ outputs, the faulty SM can be effectively localized. The proposed IF-based fault localization method only requires SM capacitor voltages in the MMC to construct concise low-data-volume tree models, and uses sparsity and difference properties of outlier data to localize fault, and accordingly it simplifies calculation complexity. In addition, it does not require the MMC's mathematical models and manual setting of empirical thresholds. Simulation and experiment are conducted, and the results confirm the effectiveness of proposed method.
AB - Fault localization is one of the most important issues for modular multilevel converters (MMCs) consisting of numerous switches. This article proposes an isolation forest (IF) based submodule (SM) switch open-circuit fault localization method for MMCs. Based on the continuous sampling SM capacitor voltages, a number of isolation trees (ITs) are produced to construct the IFs for MMCs. Through the comparison of continuous IFs’ outputs, the faulty SM can be effectively localized. The proposed IF-based fault localization method only requires SM capacitor voltages in the MMC to construct concise low-data-volume tree models, and uses sparsity and difference properties of outlier data to localize fault, and accordingly it simplifies calculation complexity. In addition, it does not require the MMC's mathematical models and manual setting of empirical thresholds. Simulation and experiment are conducted, and the results confirm the effectiveness of proposed method.
KW - Isolation forest (IF)
KW - isolation tree (IT)
KW - modular multilevel converter (MMC)
KW - open-circuit fault
KW - submodule (SM)
UR - http://www.scopus.com/inward/record.url?scp=85128660635&partnerID=8YFLogxK
U2 - 10.1109/TIE.2022.3167138
DO - 10.1109/TIE.2022.3167138
M3 - Journal article
SN - 0278-0046
VL - 70
SP - 3090
EP - 3102
JO - I E E E Transactions on Industrial Electronics
JF - I E E E Transactions on Industrial Electronics
IS - 3
M1 - 9760235
ER -