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Because of the advantages of simple and robust configuration, high reliability and low cost, the doubly salient electromagnetic motor (DSEM) has a broad application prospects in high speed areas. Core-loss predication is an important issue in the design and analysis of electric motors, especially in high speed application. However, because of the serious uneven distribution and local oversaturation...
The system time delay, which can be several times greater than the switching period, is typically neglected during the design of a three-phase voltage source rectifier system. As a result, the system time delay can cause different types of deteriorations, including a surge in the ac current, an overshoot in the dc-link voltage, and a decrease in system stability. This study first develops a dc model...
LCL filter has the advantage of small size and strong inhibition of high frequency harmonic currents. The parameter design of LCL filter mostly considers switching frequency harmonics. The attenuation of single-time harmonic current is always treated as optimization target. Thus the designed parameters may too large. What's more, the THD requirement is not easy to verify. This paper proposes an optimization...
This paper concerns the improvements of the isolated symmetry half-bridge bidirectional DC/DC converter when applied in supercapacitor (SC) energy storage system. The guidelines to calculate the ZVS resonance elements were proposed. Meanwhile, a novel model of the converter contains duty ratio as control element was derived. With the model, a phase-shifted plus feed-forward control system was proposed,...
The natural convection heat loss characteristics of a solar cavity receiver have been investigated by numerical simulation method. The results show that, the natural convection heat loss, the convection heat transfer coefficient and Nusselt number increase with the increment of opening ratio. However, due to the consideration of physical property variation of air in this study, the natural convection...
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