期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 36, 期 11, 页码 12292-12308出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2021.3075447
关键词
Flying-capacitor multilevel (FCML) converter; modeling; short-circuit; transient response; voltage-source converter
资金
- Reliable Power Electronics-Based Power System (REPEPS) Project at the Department of Energy Technology, Aalborg University, Villum Investigator Program - Villum Foundation
- U.S. Department of Energy through the Electric Drive Technologies Consortium [DE-EE0008712]
The flying-capacitor multilevel converter is a promising topology with reduced switch voltage rating, but vulnerable to device failure during short-circuit conditions. While there is research interest in fault-tolerant operation and balancing, there is limited focus on short-circuit fault analysis of the converter; this article presents a comprehensive model describing the large-signal short-circuit switching behavior of a general N-level flying-capacitor multilevel converter, aimed at providing conservative design guidelines for practicing engineers.
Addressing the increasing demand for high-efficiency and high-power-density converters, the flying-capacitor multilevel converter has shownitself as a promising topology. Akey advantage of this topology is the reduced voltage rating of the switches, though also makes it vulnerable to device failure during short-circuit conditions. Despite large interest in fault-tolerant operation of these converters, alongside detailed descriptions of flying-capacitor balancing, little research has focused on the converter short-circuit fault analysis, which may cause a switch failure if not properly designed for. Therefore, this article presents a comprehensive model describing the large-signal short-circuit switching behavior of a general N-level flying-capacitor multilevel converter. Highly simplified models used to predict the evolution of the switch current and voltage stress during the fault are proposed, targeted at practicing engineers for conservative design guidelines. These models are used to determine the critical time for remedial action of the converter before reaching some predefined maximum conditions. A 2-to-10-level fully configurable flying-capacitor multilevel converter and a fault circuit hardware prototype are used to experimentally perform different short-circuit tests that show a good match to the measured behavior.
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