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In this paper, a model of a battery/fuel-cell based aircraft auxiliary power unit (APU) is developed. The APU model is integrated into a main power channel of a VSCF aircraft electric power system at the high voltage DC bus. The transient performance of the integrated aircraft electric power system is studied under a large share of nonlinear loads.(More)
In this paper, a comprehensive model of the variable-speed constant-frequency aircraft electric power system is developed to study the performance characteristics of the system and, in particular, the system power quality over a frequency range of operation of 400 Hz to 800 Hz. A fully controlled active power filter is designed to regulate the load terminal(More)
The ever-increasing number of power electronic converters connected to the aircraft electric power system significantly increases harmonic levels and voltage transients in that system. Stringent limits on harmonic current distortion and perturbation of the aircraft electric power supply demands accurate simulation and development of high performance filters(More)
A model of the advanced aircraft electric power system is developed and studied under variable-speed constant-frequency (VSCF) operation. The frequency of the generator's output voltage is varied from 400-Hz to 800-Hz for different loading case-studies. Non-linear DC loads in addition to the different passive and dynamic AC loads are included in the(More)
In this paper a More Electric Aircraft (MEA) electric power system is modeled and simulated with a fuel cell/battery hybrid Auxiliary Power Unit (APU). Fuel cell/battery hybrid power source is connected at the AC-load bus bar of 200-VAC and 400-Hz. Due to the DC output of the hybrid power source, a 12-pulse inverter is used at the output of the APU. The two(More)
This paper presents the analysis of a distribution system connected with distributed generation (DG) units. The developed technique is based on the steady state voltage stability index. The weakest branches in the distribution system which are more likely go to the instability region are selected for DG allocation. Two optimization methods are utilized to(More)
A hybrid power source consisting from a fuel cell and a battery is proposed as an auxiliary power unit (APU) for the more electric aircraft (MEA) applications. The output of the fuel cell is controlled using a DC/DC boost converter to provide the voltage of the aircraft 270-VDC bus. The fuel cell and the battery are controlled by using DC/DC converters to(More)
Speech sensing is presented as a novel application of ultrawideband (UWB) technology, possibly improving synthetic speech and speech pathology and allowing silent speech recognition. A finite-difference time-domain (FDTD) model for the human vocal tract is presented and compared to monostatic measurements, indicating that vocal tract dynamics involving the(More)
In this study, a comprehensive model of variable-speed, constant-frequency (VSCF) aircraft electric power system (AEPS) with a large share of nonlinear loads is developed. The model is used to study the performance of the system under different nonlinear loading conditions. The performance of the VSCF AEPS is studied over the entire range of the aircraft(More)
The modeling and simulation of a 1kW vertical-axis direct drive topology wind turbine are implemented. An axial flux permanent magnet synchronous generator with multi-pole is directly connected to the wind turbine shaft. The wind turbine system is controlled to operate at constant tip-speed ratio and hence maximizing the power extracted from the wind. For(More)