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A modified dc-link voltage-balancing scheme for a three-level neutral-point-clamped inverter with an interior permanent magnet synchronous machine is presented with a wider range of machine operation including field weakening. It uses two dc-link voltage sensors to take care of the voltage differences and keeps it to a required tolerance level. A switching control strategy is developed using a space...
A modified virtual space vector based DC-link voltage balancing strategy is proposed in this paper. The summation of the three phase currents for the virtual vector needs not to be zero and it also keeps the two capacitor voltages balanced over a wider range of load variations. The duty cycles for all the power switches are also derived in this paper. Due to the reduced use of medium voltage vectors...
This paper presents a novel DC-link voltage balancing algorithm for a 3-level DC/AC traction inverter drive. In this topology, two DC-link capacitor voltages and three-phase line currents are measured, to generate the control pulses for the traction inverter, based on space-vector pulse width modulation (SV-PWM) scheme. Depending on the states of the two DC-link capacitors, redundant voltage vector...
A modified DC-link voltage balancing scheme is proposed, which keeps the two DC-link capacitor voltage differences at a desired level for wider load variation and for low power factor. Moreover, the proposed control strategy uses a reduced number of switching sequences compared to conventional DC-link voltage balancing strategy, which helps to reduce the switching losses. Effects of low power factor...
A performance comparison study for a two- and three-level inverter based permanent magnet synchronous machine (PMSM) drive has been carried out. A novel space-vector pulse width modulation (SV-PWM) based DC-link voltage balancing algorithm is also presented, to drive the machine from three-level inverter. The proposed algorithm keeps the two DC-link capacitor voltages at their specific voltage tolerance...
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