A boost converter is used in various applications to obtain a higher voltage than the input voltage. One of the current main circuit systems for hybrid electric vehicles (HEVs) is a combination of a two-phase boost converter (parallel circuit) and a three-phase two-level inverter. In this study, we focus on the boost converter to achieve even higher efficiency and propose an interleaving scheme for a boost converter suitable for a three-level inverter (series circuit). The series circuit has two capacitors connected in series and makes it suitable as a power supply for a three-level inverter. We analyze the input current ripple of the series and parallel circuit in order to show the superiority of the series circuit. Furthermore, we propose a novel output voltage control strategy using an optimal regulator, namely a Linear Quadratic Regulator (LQR), for the series circuit. As a result, we found the input current ripple of the series circuit is smaller than the parallel circuit and demonstrated the superiority of the series circuit. The simulation and experimental results show the effectiveness of the proposed interleaving scheme and optimal regulator.
This paper proposes a control method to suppress vibrations in a double-star winding permanent-magnet synchronous motor (PMSM). The double-star winding PMSM, which has two three-phase windings, can be used to improve reliability and torque ripple cancelation. A 6th order torque ripple is canceled by providing a phase angle of 30° to the mechanical angle between the two windings. A temporal 12th order radial force vibration causes a breathing mode vibration, which uniformly deforms the stator core in a double-star winding PMSM. The breathing mode vibration is suppressed by superimposing the 6th order current. In this study, the temporal 12th order and spatial 0th order radial force, which causes the breathing mode vibration, was reduced by 86.3% by superimposing the 6th harmonic current via simulations. The radial acceleration was experimentally measured on the surface of a motor. The temporal 12th order radial acceleration on the motor surface exhibited a reduction of 66.5%.
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