Dual-three-phase multilevel inverters have gained attention due to their numerous features, including high-quality voltage and current waveforms, increased power ratings, and enhanced fault tolerance. This study presents a comparative analysis of two distinct control strategies for dual three-phase, three-level neutral point clamped inverters and considers the interconnection of the DC-link mid-points. The objective is to analyze the effects of the control strategy that aims to ensure balanced voltage distribution across the DC-link capacitors under all operating conditions, suppress low-frequency voltage oscillations, and reduce switching losses through the adoption of a conventional single-step modulation strategy. The boundary limit of the operating region in which the voltage oscillations of the DC-link capacitors can be eliminated is identified and compared for two different control strategies and the traditional space vector pulse width modulation. Experimental tests are performed with an asymmetrical dual-three-phase induction motor fed by two three-phase, three-level NPC inverters.
Vancini, L., Boico, G., Mengoni, M., Rizzoli, G., Zarri, L., Tani, A. (2025). Effects of Control Strategies and DC-Link Mid-Point Connection for Voltage Balancing and Switching Losses in Dual-Three-Phase NPC Inverters. IEEE TRANSACTIONS ON POWER ELECTRONICS, 41, 1929-1942 [10.1109/TPEL.2025.3611672].
Effects of Control Strategies and DC-Link Mid-Point Connection for Voltage Balancing and Switching Losses in Dual-Three-Phase NPC Inverters
Vancini L.;Boico G.;Mengoni M.;Rizzoli G.;Zarri L.;Tani A.
2025
Abstract
Dual-three-phase multilevel inverters have gained attention due to their numerous features, including high-quality voltage and current waveforms, increased power ratings, and enhanced fault tolerance. This study presents a comparative analysis of two distinct control strategies for dual three-phase, three-level neutral point clamped inverters and considers the interconnection of the DC-link mid-points. The objective is to analyze the effects of the control strategy that aims to ensure balanced voltage distribution across the DC-link capacitors under all operating conditions, suppress low-frequency voltage oscillations, and reduce switching losses through the adoption of a conventional single-step modulation strategy. The boundary limit of the operating region in which the voltage oscillations of the DC-link capacitors can be eliminated is identified and compared for two different control strategies and the traditional space vector pulse width modulation. Experimental tests are performed with an asymmetrical dual-three-phase induction motor fed by two three-phase, three-level NPC inverters.| File | Dimensione | Formato | |
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FINAL VERSION.pdf
embargo fino al 18/09/2027
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