Search

This paper reports a comprehensive optimization process of the associated passive components of three-phase front-end interleaved boost converters to enhance the power density. The effects of the circulating zero-sequence current between the rectifiers were analyzed in detail, and the mean input current model was developed in the presence of a circulating current. The model was then incorporated into the development of a physics-based average current controller to compensate for the input current low-order harmonic distortions without sacrificing the system power density. The proposed method is expected to be an attractive solution for enhancing the power density of consumer electronic applications needed to meet the harmonic regulations. [ABSTRACT FROM AUTHOR]

With the increasing integration of renewable energy generation into high-power grids, transmission at the dc level is becoming increasingly more useful than ac transmission. In this regard, emerging applications, such as offshore wind farms, require a high voltage gain dc/dc conversion system to interface with high-power transmission networks. This paper presents a new high-voltage gain resonant switched-capacitor dc/dc converter for high-power offshore wind energy systems. The proposed dc/dc converter is characterized by the resonant switching transitions to achieve minimal switching losses and maximum system efficiency. Therefore, a higher switching frequency is conceivable to attain a higher power density. The double stage output voltage of the proposed converter operates at seven times as high as the input voltage with a small device count. The output capacitors are charged and discharged continuously by a 180° phase shift with respect to each other to eliminate the output voltage ripples with the low capacitance requirements. The proposed series-modular and cascade configurations show the intrinsic advantage of being readily applicable to multistage power switching converters. The developed topology has been implemented on a 5-kW prototype converter to test its feasibility. [ABSTRACT FROM AUTHOR]