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segunda-feira, 19 de setembro de 2016

ADVANCE THREE PHASE POWER FACTOR CORRECTION SCHEMES FOR UTILITY INTERFACE OF POWER ELECTRONIC SYSTEMS A Thesis by MESAAD WALEED ALBADER -Texas A&M University



ADVANCE THREE PHASE POWER FACTOR CORRECTION SCHEMES FOR UTILITY INTERFACE OF POWER ELECTRONIC SYSTEMS A Thesis by MESAAD WALEED ALBADER Submitted to the Office of Graduate and Professional Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE

Chair of Committee, Prasad Enjeti
Co-Chair of Committee, Hamid Toliyat
Committee Members, Shankar P. Bhattacharyya
Won-Jong Kim
Head of Department, Chanan Singh
August 2014
ABSTRACT
 Modern power electronic systems operate with different voltage and/or frequency rating such as Adjustable speed drive, Micro Grid, Uninterruptable Power Supplies (UPS) and High Voltage DC Transmission Systems. To match power electronic systems with the mains supply, DC link converters are used. The first stage of the DC link converter is the AC/DC conversion (rectifier). The rectifier type utility interface has substantial harmonics result in poor power quality due to low power factor and high harmonic distortion. Power Factor Correction (PFC) schemes are effective methods to mitigate harmonics and address this issue. In this thesis, analyses of three approaches for high power density rectifiers are developed. In the first study, modular three phase boost rectifiers operating in DCM are coupled in order to increase the power density. Major drawback of this rectifier is the high currents ripple in both the source and the DC link sides which require large EMI filter size -could be larger than the rectifier component size- and large DC filter capacitor size. This thesis proposes coupling modular three phase boost DCM rectifiers, the currents in both source and DC link sides are interleaved and consequently the currents ripple dramatically decreased results in small component size of the EMI filter and the DC filter capacitor leading to high power density rectification. Also, optimization of the number of the rectifier modules to achieve maximum power density is presented. Moreover, the switching function of each rectifier employs harmonic injection technique to reduce the low order harmonics. And, the DC output voltage is varied with the load power such that the operation is at the boundary between CCM and DCM to achieve maximum power density tracking.
 LINK ORIGINAL THESIS
http://oaktrust.library.tamu.edu/bitstream/handle/1969.1/153331/ALBADER-THESIS-2014.pdf?sequence=1

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