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Yadav, Apurv Kumar; Gopakumar, K.; R, Krishna Raj; Umanand, Loganathan; Bhattacharya, Subhashish; Jarzyna, Wojciech
IEEE transactions on power electronics, 2019-Oct., 2019-10-00, Letnik: 34, Številka: 10Journal Article
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 dc 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 for 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.
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