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An Optimal Current Control Strategy for Asymmetrical Hybrid Multilevel Inverters.
- Source :
-
IEEE Transactions on Industry Applications . Sep2018, Vol. 54 Issue 5, p4425-4436. 12p. - Publication Year :
- 2018
-
Abstract
- An optimal current control strategy for asymmetrical hybrid multilevel inverters (MLIs) is proposed in this paper enabling their use on motor drives, static synchronous compensators, and photovoltaic and wind generators, where a fast and precise current regulation is required. A key feature of these highly efficient converters is that an ac machine (motor or transformer) operates according to an open-end winding configuration, connected on one side to a main MLI and, on the other side, to an auxiliary two-level inverter (TLI). The first efficiently controls the main power stream operating at a low switching frequency, while the TLI acts as an active power filter, exploiting a conventional high-frequency two-level pulsewidth modulation (PWM) technique. The proposed control scheme optimally exploits the key features of the two inverters by suitably sharing the control task. In fact, a predictive current control is assigned to the MLI, which can be accomplished by low switching frequency operations, while the high switching frequency of the PWM-operated TLI is exploited to accomplish a fast and precise closed-loop current control, processing only a part of the power stream flowing through the system, thus producing low power losses. Simulations and experimental results confirm the consistency of the proposed approach. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ELECTRIC inverters
*VOLTAGE control
*ELECTRIC current converters
Subjects
Details
- Language :
- English
- ISSN :
- 00939994
- Volume :
- 54
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Industry Applications
- Publication Type :
- Academic Journal
- Accession number :
- 131880498
- Full Text :
- https://doi.org/10.1109/TIA.2018.2832024