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http://dx.doi.org/10.7471/ikeee.2019.23.4.1218

Fault-tree based reliability analysis for paralleled half-bridge sub-module of HVDC  

Kang, Feel-soon (Dept. of Electronics and Control Engineering, Hanbat National University)
Song, Sung-Geun (Energy conversion research center, Korea Electronics Technology Institute)
Publication Information
Journal of IKEEE / v.23, no.4, 2019 , pp. 1218-1223 More about this Journal
Abstract
In HVDC systems, the full-bridge submodule increases the number of components compared to the half-bridge submodule, but the failure-rate can be reduced by securing 100 % redundancy. However, full-bridge submodules require more complex control algorithms to ensure the redundancy and to prevent arm-short with sufficient dead-time. To solve this problem, we analyse the failure-rate of the paralleled half-bridge configuration with the same number of components and 100 % redundancy as the full-bridge submodule. The fault tree analysis (FTA) method is applied to the conventional part failure analysis to reflect the operation risk of the submodule, thereby predicting the life-cycle of the submodule more accurately. To verify the validity, the failure-rate results of the proposed FTA based analysis method are compared with the failure rate obtained by the part failure method.
Keywords
Failure-rate; Fault-tree analysis (FTA); High voltage direct current (HVDC); Meantime between failure (MTBF); Modular multilevel converter (MMC); Paralleled Half-bridge; sub-module;
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