A multi-layer protection scheme for MMC-power electronic transformers
As a key interfacing equipment for the AC-DC hybrid distribution network, power electronic transformers (PETs) lack a protection scheme with high sensitivity and reliability. To address this issue, this paper proposes a multi-layer protection scheme for modular multilevel converter-power electronic...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-08-01
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| Series: | International Journal of Electrical Power & Energy Systems |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0142061525003345 |
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| Summary: | As a key interfacing equipment for the AC-DC hybrid distribution network, power electronic transformers (PETs) lack a protection scheme with high sensitivity and reliability. To address this issue, this paper proposes a multi-layer protection scheme for modular multilevel converter-power electronic transformers (MMC-PETs). Firstly, the fault characteristics and fault propagation mechanisms of various MMC-PET faults are analysed. On this basis, this study deconstructs MMC-PET into three layers and constructs criteria for each layer of protection. Among them, the two supplementary protection layers are introduced to improve protection sensitivity for faults inside MMC-PET. And the protection for faults outside MMC-PET can remain unaffected by the suppression of negative sequence currents during AC-side faults. Finally, a 10 kV/380 V MMC-PET is modelled in MATLAB/Simulink and RT-LAB real-time simulation platform, and the effectiveness of the proposed protection scheme is verified via simulation results. |
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| ISSN: | 0142-0615 |