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PROJECT TITLE :

Modulation Scheme Analysis for High-Efficiency Three-Phase Buck-Type Rectifier Considering Different Device Combinations

ABSTRACT:

The three-part buck-kind rectifier features a step-down ac-dc conversion perform, smaller filter size, inrush current limiting capability, and potential for top efficiency, where its switching loss depends on the modulation theme and the particular semiconductors used. In this paper, three different device combos are compared through experiments on their switching characteristics for the buck rectifier application. It is shown that the switching performance of 2 series-connected devices becomes worse than one device because of the superposition of the nonideal semiconductor characteristics. Moreover, the switching loss within the commutation between two switches is typically above the one within the commutation between a switch and also the freewheeling diode. Taking into consideration both sorts of commutations, the switching loss of the buck rectifier is then modeled and the analytical equations are derived for four area vector modulation schemes. According to the analysis, every modulation scheme has its own field for prime-efficiency application. The most advantageous modulation scheme is identified during this paper for every of the device combinations investigated.


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