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Instantaneous Balancing of Neutral-Point Voltages for Stacked DC-Link Capacitors of a Multilevel Inverter for Dual-Inverter-Fed Induction Motor Drives.
- Source :
- IEEE Transactions on Power Electronics; Mar2019, Vol. 34 Issue 3, p2505-2514, 10p
- Publication Year :
- 2019
-
Abstract
- This paper proposes a novel method for instantaneous balancing of neutral-point (NP) voltages with stacked multilevel inverters (MLIs) for variable-speed drives. The stacked MLI uses series-connected dc sources and NPs (connecting points of dc sources) to obtain the desired levels. The balancing of NP voltages are obtained by using a low-voltage-capacitor-fed cascaded H-bridge (CHB) per phase of a symmetrical six-phase induction machine (IM), which ensures zero current drawn from NPs (at any given instant). Since no current is drawn from NPs, the single dc-link operation with stacked capacitors is also possible. The scheme is suitable for applications, where low-voltage dc sources and batteries are stacked to form a dc link. A variable-speed operation is done using a seven-level inverter scheme for a symmetrical six-phase IM, which is formed by three dc-link stacked capacitors cascaded with two low-voltage-capacitor-fed CHBs per phase. Furthermore, the method is extended for an open-end IM to obtain a seven-level common-mode eliminated space vector structure using a single dc link. The generalization of this method for any stacked $n$ -level inverter without NP voltage deviation is also presented in this paper. The experimental results and analysis are included to validate the proposed method. [ABSTRACT FROM AUTHOR]
- Subjects :
- ELECTRIC potential
DIRECT currents
CAPACITORS
ELECTRIC inverters
INDUCTION motors
Subjects
Details
- Language :
- English
- ISSN :
- 08858993
- Volume :
- 34
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- IEEE Transactions on Power Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 134602557
- Full Text :
- https://doi.org/10.1109/TPEL.2018.2837680