Abstract
This paper proposes a non-invasive fault location method for modular multilevel converters (MMC) considering light load conditions. The prior-art fault location methods of the MMC are mostly developed under full load conditions. However, it is revealed that the faulty arm current will be suppressed to be unipolar when the open-circuit fault happens on the submodule switch under a light load. This leads to the capacitor voltage of the healthy and faulty submodules rising or falling with the same variations, increasing the difficulty of fault location. The proposed approach of injecting the second-order circulating current will rebuild the bipolar arm current of the MMC and enlarge the capacitor voltage deviations between the healthy and faulty SMs. As a result, the fault location time is significantly shortened. The simulations are carried out to validate the effectiveness of the proposed approach, showing that the fault location time is reduced to 1/6 compared with the condition without second-order circulating current injection.
Originalsprog | Engelsk |
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Titel | Proceedings of the IECON 2022 – 48th Annual Conference of the IEEE Industrial Electronics Society |
Antal sider | 6 |
Forlag | IEEE |
Publikationsdato | 2022 |
Sider | 1-6 |
Artikelnummer | 9968540 |
ISBN (Trykt) | 978-1-6654-8026-0 |
ISBN (Elektronisk) | 978-1-6654-8025-3 |
DOI | |
Status | Udgivet - 2022 |
Begivenhed | 48th Annual Conference of the IEEE Industrial Electronics Society, IECON 2022 - Brussels, Belgien Varighed: 17 okt. 2022 → 20 okt. 2022 |
Konference
Konference | 48th Annual Conference of the IEEE Industrial Electronics Society, IECON 2022 |
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Land/Område | Belgien |
By | Brussels |
Periode | 17/10/2022 → 20/10/2022 |