TY - JOUR
T1 - A Novel Detection and Localization Approach of Open-Circuit Switch Fault for the Grid-Connected Modular Multilevel Converter
AU - Jin, Yu
AU - Xiao, Qian
AU - Jia, Hongjie
AU - Ji, Yanchao
AU - Dragicevic, Tomislav
AU - Teodorescu, Remus
AU - Blaabjerg, Frede
PY - 2022
Y1 - 2022
N2 - The open-circuit fault detection and localization (FDL) technique can improve the reliability of the modular multilevel converter (MMC). However, the conventional software-based FDL methods usually have a heavy computation burden or a limited localization speed. This paper proposes a simplified and fast software-based FDL approach for the grid-connected MMC. Firstly, the errors between the measured state variables (the output current and the circulating current) and their estimated values are calculated. By comparing these errors with their threshold values, the switch fault can not only be detected, but also be localized to the specific arm. Then, the capacitor voltages in this faulty arm are collected, and the submodule (SM) with the highest capacitor voltage is selected. To confirm the switch fault in this SM, a modified Pauta criterion is presented to check the abnormal voltage data. As a result, the computation burden of the proposed software-based FDL approach is significantly reduced, and the faulty SM can be localized in a short period. Simulation and experimental results verify that the proposed approach can effectively detect and locate different open-circuit faults, and it is immune to the step of power references.
AB - The open-circuit fault detection and localization (FDL) technique can improve the reliability of the modular multilevel converter (MMC). However, the conventional software-based FDL methods usually have a heavy computation burden or a limited localization speed. This paper proposes a simplified and fast software-based FDL approach for the grid-connected MMC. Firstly, the errors between the measured state variables (the output current and the circulating current) and their estimated values are calculated. By comparing these errors with their threshold values, the switch fault can not only be detected, but also be localized to the specific arm. Then, the capacitor voltages in this faulty arm are collected, and the submodule (SM) with the highest capacitor voltage is selected. To confirm the switch fault in this SM, a modified Pauta criterion is presented to check the abnormal voltage data. As a result, the computation burden of the proposed software-based FDL approach is significantly reduced, and the faulty SM can be localized in a short period. Simulation and experimental results verify that the proposed approach can effectively detect and locate different open-circuit faults, and it is immune to the step of power references.
KW - Modular multilevel converter
KW - Fault detection
KW - Fault localization
KW - Open-circuit fault in IGBT
KW - Switch fault
U2 - 10.1109/TIE.2022.3153810
DO - 10.1109/TIE.2022.3153810
M3 - Journal article
SN - 0278-0046
VL - 70
SP - 112
EP - 124
JO - IEEE Transactions on Industrial Electronics
JF - IEEE Transactions on Industrial Electronics
IS - 1
ER -