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3-Level neutral point clamped (NPC) converters are being considered for application in the propulsion system of Electric Vehicles (EVs). The issue of voltage balancing in the DC capacitors has been extensively investigated, unlike the unbalance in the power losses across the switches, which can not only reduce the maximum power that can be delivered by the drive but also its lifetime. This paper discusses...
A reduced common mode voltage (CMV) based DC-link voltage balancing strategy is proposed for a neutral point clamped (NPC) three-level inverter with permanent magnet synchronous machine. Compared to the earlier proposed strategy, it completely eliminates the Vdc/2 corresponding CMV by eliminating the two zero voltage vectors (PPP, NNN) from the space vector switching sequences. Hence, it uses only...
This paper provides an experimental discussion on adjustable-speed electrical drives using a modular multilevel cascade converter based on triple-star bridge cells (MMCC-TSBC) when the motor frequency is passing through, or equal to, the supply frequency. The TSBC converter is one of the most suitable candidates for medium-voltage, high-power motor drives with regenerative braking. However, its capacitor-voltage...
Rotating electric machinery is usually constructed of iron/steel laminations, copper windings, and permanent magnets. This paper investigates fluid-filled, electrostatic rotating machines for the ultimate ambition of transitioning fundamental magnetic materials to dielectrics in order to reduce production costs. The study of the axial-peg-style electrostatic rotating machine focuses on basic geometric...
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