Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 68, Issue 6, Pages 4718-4726Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2020.2991998
Keywords
Fault tolerance; Fault tolerant systems; Legged locomotion; Circuit faults; Stress; Modulation; Modular multilevel converters; Fault-tolerant strategy; modular multilevel converter (MMC); postfault condition; regenerative drive application
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Funding
- Iran National Science Foundation
- Alexander von Humboldt Foundation, Germany
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The article proposes a fault-tolerant strategy for recovering the performance of a modular multilevel converter under submodule fault conditions by compensating for missing capacity with healthy submodules. The method reduces voltage stress on switches in postfault conditions and ensures homogeneous distribution of losses and temperatures in all parts of the converter. The proposed method enhances fault-tolerant capability without adding cost or complexity to the system.
In this article, we propose a fault-tolerant strategy to recover the full performance of a modular multilevel converter (MMC) under submodule (SM) fault condition for regenerative medium-voltage drive applications. The proposed method has the feature to retrieve line voltage amplitude during the postfault condition back to its nominal value. In this method, the missing capacity of the converter due to the fault condition is compensated by all remaining healthy SMs. The main advantage of the proposed method in comparison with previous works is that it imposes a lower voltage stress on switches in postfault conditions without severe circulating current. Remaining healthy SMs also operate at a similar condition, which leads to the feature of homogeneous distribution of loss and temperature in all parts of the converter. The proposed method is applicable for the regenerative MMC-based drives as well as the back-to-back configuration of MMC without adding cost or complexity to the whole system. A generalized approach is presented and its result is compared with other methods. The simulation and experimental results are provided to validate the performance and feasibility of the proposed method that can effectively enhance the fault-tolerant capability of this converter.
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