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48 results on '"ALI, Husan"'

10. Behavioral Modeling Paradigm for More Electric Aircraft Power Electronic Converters

Author

Ali, Husan

Subjects
Technology & Engineering
Abstract

To control the power flow among various energy sources and loads of a power system of modern more electric aircrafts, power electronics converters are employed. The integration of multiple sources into distribution system and their interconnection with variety of loads through power electronic converters results in a complex dynamic system. Modeling of these systems prior to implementation becomes necessary to analyze and predict system’s behavior. The classical modeling approaches require detail knowledge about the topology and parameters of the active and passive components of the power electronics converters. While in modern system, most of the power electronics converters are ready to use power electronics modules. These modules come from different manufacturers, lacking the necessary information to build the conventional switch or average models. The chapter would cover dynamic behavioral modeling technique for power electronics systems to be employed in more electric aircrafts, which do not require any prior information about the internal details of the system.

Published
2020

21. A Novel 24-Pulse Rectification System

Author

Khan, Shahbaz, primary, Zhang, Xiaobin, additional, Ali, Husan, additional, Zaman, Haider, additional, Saad, Muhammad, additional, Khan, Bakht Muhammad, additional, and Karamat, Jawad, additional

Published
2018
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31. Reliability Modeling of SiC-Based Multiphase Synchronous Boost Converter.

Author

zaman, Haider, Zheng, Xiancheng, Ali, Husan, Khan, Shahbaz, and Wu, Xiaohua

Subjects
RELIABILITY in engineering, SILICON carbide, CASCADE converters, BAND gaps, SEMICONDUCTORS, METAL oxide semiconductor field-effect transistors
Abstract

Despite attractive thermal and electrical characteristics, wide band-gap semiconductor devices such as SiC MOSFET have struggled to penetrate in aircraft applications because of reliability issues in earlier releases. The second and third generation SiC MOSFETs have achieved improved reliability using high quality oxides and innovative fabrication process. This paper presents a failure rate model for SiC MOSFET based on the accelerated test data at a given operating condition. The proposed model enables the system level reliability analysis of second generation SiC MOSFET-based converters. The reliability of SiC two-phase synchronous boost converter has been evaluated at two different operating conditions: 10 and 16 A load condition. To predict the life time of the converter even after a chain of component failures, Markov's reliability model of the converter is developed. The state transition probabilities and mean time to failure (MTTF) of SiC converter are compared against its Si counterpart which shows that second generation SiC MOSFETs are for aircraft applications with high reliability. [ABSTRACT FROM AUTHOR]

Published
2019
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41. A Droop Control Based Three Phase Bidirectional AC-DC Converter for More Electric Aircraft Applications.

Author

Xiancheng Zheng, Fei Gao, Ali, Husan, and Huamei Liu

Subjects
AC DC transformers, ELECTRICAL engineering, AIRPLANE design, ELECTRIC filters, ELECTRIC potential
Abstract

This paper addresses the design and implementation of a droop controlled three phase bidirectional AC-DC converter for more electric aircraft (MEA) applications. A unified control strategy using a droop characteristic is presented to achieve the bidirectional power flow between the AC and DC source while maintaining a stable DC output voltage. Based on the rigorous control design, the converter is capable of operating over a wide frequency range with a unity power factor. The key findings obtained from the theoretical analysis are confirmed by simulation studies and further validated by a scaled down laboratory prototype. The practical results show good performance of the bidirectional converter and demonstrate the effectiveness of the proposed control strategies. [ABSTRACT FROM AUTHOR]

Published
2017
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48. Design and Implementation of Computationally Efficient MC-CDMA Transceiver and Performance Analysis in Fading Channels.

Author

Habib, Usman, Sher, Mazhar, Aftab, Muhammad, and Ali, Husan

Abstract

This paper describes an optimal design of Multi Carrier Code Division Multiple Access (MC-CDMA) based transceiver in terms of complexity and number of computations for different fading environments. The performance gap between OFDM, MC differential-CDMA and proposed optimal MC-CDMA transceiver is evaluated for spectral efficiency and PSNR in different fading environments and results proved that proposed transceiver provided much efficient robustness against hostile frequency selective fading, high spectral efficiency and frequency diversity. The proposed algorithm was assessed dually in terms of simulations in MATLAB and implementation on DSP kit for real time data. [ABSTRACT FROM PUBLISHER]

Published
2013
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