Hardware-Based Comparative Analysis of Multilevel Inverter Topologies for Integrated Motor Drives Considering Overload Operation
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Date
2023
Publication Type
Journal Article
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Abstract
With today's demand for increased industrial process automation a trend towards Integrated Motor Drives (IMDs) has evolved allowing a low complexity and compact installation of the drive system. Especially servo applications with high short-term overload requirements (e.g., three times the nominal current for several seconds) are a thermal challenge for the power electronics. Consequently, high efficiencies and power densities are key requirements of these motor-integrated Variable Speed Drives (VSDs). Multi-Level (ML) inverter topologies allow small LC output filter designs and benefit from utilizing low-voltage semiconductors with superior conduction and switching performance, and thus represent an interesting approach for future IMDs. In this work an experimental comparison between three different 800V DC link supplied drive systems is presented, namely between a 3L Flying Capacitor Converter (3L-FCC) (employing 650V GaN HEMTs), a 7L Flying Capacitor Converter (7L-FCC) (using 200V Si MOSFETs) and its promising alternative, a 7L Hybrid Active Neutral-Point Clamped Converter (7L-HANPC) (using both, 650V GaN HEMTs and 200V Si MOSFETs). All three systems are realized as hardware demonstrators for the same specifications, i.e., for integration into a Permanent Magnet Synchronous Motor (PMSM) with a case temperature of 90∘C , 7.5kW nominal output power at > 99% efficiency and a short-term overload capability of three times the nominal current for 3s . Thereby, the efficiencies and the thermally critical overload capability are experimentally verified. Overall, the 3L-FCC shows the best performance trade-off with lowest complexity and/or highest reliability and minimal control effort.
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published
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Journal / series
Volume
4
Pages / Article No.
934 - 944
Publisher
IEEE
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Software
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Subject
Integrated motor drive; multi-level inverter; overload operation; variable speed drives; Variable speed drive; variable speed drive; WBG power semiconductors
Organisational unit
03573 - Kolar, Johann W. (emeritus) / Kolar, Johann W. (emeritus)