A Multilevel Inverter With Inherent Common Coupling Point Voltage Balancing of Stacked Capacitors Across a Single DC-Link for Induction Motor Drives

Debnath, Tutan; Roy, R.; Majumder, Mriganka Ghosh; Imthias, Mohammed; Gopakumar, K.; Umanand, L.; Franquelo, Leopoldo G.

doi:10.1109/tie.2021.3137443

Cited by 5 publications

(2 citation statements)

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“…1. Four series-connected capacitors across the DC-link are denoted by C t : top most DC-link three level CHB inverter is a nine-level inverter [24], [30].…”

Section: A Three-phase Nine-level Invertermentioning

confidence: 99%

“…However, these above techniques control the voltage of DC-link capacitors on an average time basis of an entire fundamental cycle. The techniques presented in [22]- [24] have introduced an instantaneous voltage balancing scheme using a six-phase induction machine (IM) load. Zero neutral point current is asserted either by placing two opposite phase terminals on the same NP or by placing the terminals in the DC-link buses.…”

Section: Introductionmentioning

confidence: 99%

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A Nine-Level Inverter With Single DC-Link and Low-Voltage Capacitors as Stacked Voltage Sources With Capacitor Voltage Control Irrespective of Load Power Factor

Debnath

Gopakumar

Umanand

et al. 2022

IEEE Open J. Ind. Electron. Soc.

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This paper proposes a multilevel inverter topology with a single DC-link and series-connected capacitors as stacked voltage sources for multilevel voltage generation. The voltage deviation of a DC-link capacitor will occur whenever a phase terminal connects to the balanced neutral points (NPs: terminal joints of DC-link capacitors). On the contrary, if the voltage of a DC-link capacitor deviates from the nominal voltage, the same phase currents can be utilised to balance these neutral points. This new technique is being proposed for the first time in literature. Any voltage disturbance of the DC-link capacitors is balanced using the motor phase currents, irrespective of load power factor and modulation indices. For the balanced neutral points, whenever a phase connects to a neutral point, the other phase terminal tapping positions are varied on the DC-link to establish i A + i B + i C = 0 for that neutral point. The pole voltage level variation at motor phase terminals is undisturbed by adding extra cascaded H-bridges (CHBs) at each phase leg. The voltages of CHB capacitors are controlled conventionally by inverter pole voltage redundancies. The detailed experimental results for open-loop V/f and closed-loop field-oriented control on an induction motor are presented using a nine-level laboratory prototype.

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“…1. Four series-connected capacitors across the DC-link are denoted by C t : top most DC-link three level CHB inverter is a nine-level inverter [24], [30].…”

Section: A Three-phase Nine-level Invertermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%