Abstract
Sub-module (SM) open-circuit fault is a common type of fault in modular multilevel converter (MMC). To solve the problem of low utilization rate and limited fault-tolerant capability of SMs in existing SM fault-tolerant control strategies, the improved neutral-point shift fault-tolerant control strategy is studied in this paper. With the segmentation modulation idea, the phase voltage vectors are reconstructed through the neutral-point shift control in different stages to achieve symmetric output of line voltages after the fault. Due to the increasing of the circulating current after fault-tolerant, the harmonic extraction is performed on the circulating current and suppressed by PR controller. By designing the switching controller to correct the corresponding modulation wave parameters during different stages, the optimized suppression of the circulating current is completed, so that the MMC system has better running results under the fault-tolerant operation. Finally, the effectiveness and feasibility of the optimized control strategy are verified by simulation and experiment.
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Zhu, Q., Fan, Q., Tan, X., Li, Z., Dai, W., Xie, D. (2020). Research on Medium Voltage MMC Fault-Tolerant Optimized Control Strategy. In: Jia, L., Qin, Y., Liu, B., Liu, Z., Diao, L., An, M. (eds) Proceedings of the 4th International Conference on Electrical and Information Technologies for Rail Transportation (EITRT) 2019. EITRT 2019. Lecture Notes in Electrical Engineering, vol 638. Springer, Singapore. https://doi.org/10.1007/978-981-15-2862-0_58
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DOI: https://doi.org/10.1007/978-981-15-2862-0_58
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