Load-Independent Voltage Balancing of Multi-Level Flying Capacitor Converters in Quasi-2-Level Operation
Piotr Czyz,Panteleimon Papamanolis,Francesc Trunas Bruguera,Thomas Guillod,Florian Krismer,Vladan Lazarevic,Jonas E. Huber,Johann W. Kolar +7 more
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TLDR
In this paper, the authors proposed a load-independent FC voltage balancing approach using model predictive control (MPC) to identify the commutation sequence of individual switches within a Q2L transition that minimizes the FC or cell voltage errors.Abstract:
Quasi-2-level (Q2L) operation of multi-level bridge-legs, especially of flying-capacitor converters (FCC), is an interesting option for realizing single-cell power conversion in applications whose system voltages exceed the ratings of available power semiconductors. To ensure equal voltage sharing among a Q2L-FCC’s switches, the voltages of a Q2L-FCC’s minimized flying capacitors (FCs) must always be balanced. Thus, we propose a concept for load-independent FC voltage balancing: For non-zero load current, we use a model predictive control (MPC) approach to identify the commutation sequence of the individual switches within a Q2L transition that minimizes the FC or cell voltage errors. In case of zero load current, we employ a novel MPC-based approach using cell multiple switching (CMS), i.e., the insertion of additional zero-current commutations within a Q2L transition, to exchange charge between the FCs via the charging currents of the switches’ parasitic capacitances. Experiments with a 5-level FCC half-bridge demonstrator confirm the validity of the derived models and verify the performance of the proposed load-independent balancing concept.read more
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Proceedings ArticleDOI
Comparison of Quasi-Two-Level Operation of a Flying Capacitor Converter with Quasi-Two-Level Operation of a Modular Multilevel Converter
TL;DR: In this paper , the authors proposed a quasi-two-level operating (Q2O) mode to minimize the passive components while preserving the advantages of the multilevel topology as far as possible.
Journal ArticleDOI
Validation of the Quasi-Two-Level Operation for a Flying Capacitor Converter in Medium-Voltage Applications
TL;DR: In this article , two different quasi-two-level algorithms are analyzed for the flying capacitor converter (FCC) and a medium-voltage prototype is built and lowvoltage and mediumvoltage measurements were used to validate the concept and a particular focus is on the overvoltage, the dv/dt behavior of the converter, as well as the dynamic behavior.
References
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TL;DR: This paper covers the high-power voltage-source inverter and the most used multilevel-inverter topologies, including the neutral-point-clamped, cascaded H-bridge, and flying-capacitor converters.
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