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A Hybrid 7-Level Inverter Using Low-Voltage Devices and Operation With Single DC-Link

Yadav, Apurv Kumar and Gopakumar, K and Raj, Krishna R and Umanand, Loganathan and Bhattacharya, Subhashish and Jarzyna, Wojciech (2019) A Hybrid 7-Level Inverter Using Low-Voltage Devices and Operation With Single DC-Link. In: IEEE TRANSACTIONS ON POWER ELECTRONICS, 34 (10). pp. 9844-9853.

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Official URL: https://dx.doi.org/10.1109/TPEL.2018.2890371


This paper proposes a new 7-level inverter topology for induction motor drives. It is a hybrid topology formed by cascading a 5-level active neutral-point-clamped inverter with a 3-level T-type converter. It is obtained using low-voltage semiconductor devices with voltage blocking capability of Vdc/3 and Vdc/6. The topology uses three floating capacitors per phase, which are balanced within a pulsewidth modulation (PWM) switching duration using switching-state redundancies for each pole-voltage level. Topology forms two stacks at the front-end, which requires individual symmetrical de source. The analysis of switching loss and conduction loss is performed and compared with some of the existing 7-level multi-level inverters reported in various literatures to show the advantages of the proposed topology. Furthermore, the single dc source operation with two stacked capacitors and closed-loop control of neutral-point voltage using symmetrical six-phase induction motor is proposed. The voltage-control algorithms fin. floating capacitors and dc-link stacked capacitors are proposed, which are independent of load power factor and modulation index. Open-loop V/f and closed-loop rotor field oriented control are performed, and various results at steady and transient states are presented to validate the aforementioned claims.

Item Type: Journal Article
Additional Information: copyright for this article belongs to IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords: 7-level inverter; hybrid multi-level inverter (MLI); induction motor (IM) drive; multi-level converter; neutral-point voltage (NPV)
Department/Centre: Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Date Deposited: 21 Aug 2019 09:51
Last Modified: 21 Aug 2019 09:51
URI: http://eprints.iisc.ac.in/id/eprint/63282

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