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2016 International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles & International Transportation Electrification Conference (ESARS-ITEC)
Here is a comparison of the traction motors of two recent rolling stock units operated by the French Railway company (SNCF). The goal is to analyze the impact of these two different designs of Permanent Magnet Synchronous Machines on the efficiency and characteristics of the rolling stock.
Catalogues of manufactured transformers show that amorphous alloy core transformers applied to 50 or 60 Hz lines have about 70% core electrical losses reduction when compared to same power output transformers made with Grain Oriented (GO) Silicon Iron (FeSi) core, however amorphous alloy core transformers are also heavier than FeSi core transformers. Such weight fact makes apparently prohibitive the...
This paper presents the hardware and software design of a battery monitoring circuit developed to be used in aviation applications employing lithium-ion batteries in their electrified powertrain. The considered aircraft is a manned sailplane able to take-off and climb by using its electric propulsion system supplied by NCA/Graphite lithium-ion batteries. The battery monitoring electronics was developed...
A novel GaN on Si device is presented and tested in an “application like” circuit. The device is a Bi-Directional Normally-Off Switch aimed at AC mains powered applications, it uses a single reference electrode for gating direct and reverse conduction modes. Demonstration of the current collapse free operation of the device under 264V, 3A, 1MHz is presented.
Lightning is one of the most unpredictable and destructive forces in nature, and ensuring the protection and safety of aircraft in flight, as well as other modes of airborne transport, when struck by lightning presents a unique set of engineering challenges. In order to progress into a new generation of conductive carbon composites and/or embedded light-weight lightning protection systems, further...
Higher efficiency, power density, reliability and longer lifetime of power electronic devices would stem from progresses in material science. In this work, we propose to use a high performance thermoplastic polymer PAEK as packaging box to extend the operating temperature above 200°C. More, the laser transmission welding process has been applied to PAEK to join the two-part module. In order to validate...
Safety is becoming more and more important with the ever increasing level of safety related E/E Systems built into the cars. Increasing functionality of vehicle systems through electrification of power train and autonomous driving leads to complexity in designing system, software and safety architecture. ISO 26262 aims to reduce the complexity and to approve the traceability of the different safety...
As more electric aircraft power systems grow in complexity and power rating, the design, evaluation and testing of such systems become quite challenging tasks, while real-time simulator based hardware-in-the-loop (HIL) technique is considered a cost/time-effective solution. This paper applies RT-LAB to real time simulation for aircraft electric power system (EPS) with hardware Bus Power Control Unit...
With the application of high frequency power electronic devices, the planar transformer has been widely used in low voltage and high current module power supplies. Under high frequency working conditions, due to the existence of high frequency effects such as skin and proximity effect, the winding losses increase and take a huge part of the total power loss of the planar transformer. And the conventional...
Aircraft engines, the prime source of on-board power, play a vital role within the electrical power generation system. In literature these are considerably simplified to rudimentary engine speed. In this paper, a nonlinear zero-dimension (0-D) order turbofan engine model has been developed for use with an integrated power center. By analyzing the compressor maps in detail, the results reveal a limit...
This paper proposes a procedure for detecting the optimal speed profile of a metro vehicle. The proposed approach provides an energy-efficient driving in terms of optimal speed profile. The speed profile is obtained through the solution of a single objective optimization problem based on the minimization of the train energy consumption while satisfying specified technical and operating constraints...
Electric Road System (ERS) is a technology concept that has the potential to heavily reduce fossil fuel dependency. ERS is defined by dynamic power transfer from the road to the vehicle while the vehicle is in motion and could be achieved through different power transfer technologies from the road to the vehicle such as rail, overhead-line, and wireless solutions. The investment cost to implement...
This paper compares the efficiency of DC/DC Boost converter using SiC fly-wheel diode or synchronous rectifier in different working modes. Analyze the high current spike during turn-on transient of main switch based on simulation. The method to realize soft switch without additional devices is discussed and the problems existing in this method can be solved by the application of the new device effectively.
This paper deals with a compensation technique for non-linear behaviour of single phase modular multi-level power converter, feeding electric vehicle fast charging station with split integrated energy storage system. The proposed method calculates the voltage compensation on the basis of the error between the reference and the real currents. It allows highly improving the harmonic content of the grid...
Innovation in railway industry points the focus on the production of lightweight vehicles, with high performance, in order to save the energy power and to satisfy the environmental and safety requests. To pursue this aim, innovative materials have been increasingly used for vehicle components and structures. In this paper, the structural behavior of the shock absorber mountings (SAMs) of a novel metro...
For the hybrid energy storage system (HESS) power sharing strategy based on the state of charge (SOC), the definition of equivalent time constant is proposed for its similarity to the time constant of low-pass filter. Attempting to make a general evaluation for different sharing strategies, the time constant is used as an indicator of power sharing results in this paper. Simulation results are presented...
The electric motorcycle recently constructed at The University of Nottingham is considered to be a high performance vehicle, competing with its internal combustion engine driven counterparts. This paper presents pertinent design decisions taken to maximise the vehicle performance in race conditions, along with modelling undertaken to gain an insight into the system interaction as a whole. Readings...
An on-board traction transformer with online monitoring systems for predictive and diagnosis maintenance is presented. Today, no tele diagnosis function is connected with this component on rolling stock. Maintenance operations are made according to the suppliers' advice and return of experience. In power transformer area, the monitoring on the transformer and its accessories is essential, due to criticality...
Railway operators are increasingly faced with various problems with the traction systems of their rolling stock, such as breakdowns and obsolescence. These situations can arise very quickly and also cause major operating cost increases to be carried throughout the life of the train. Commitments to energy saving have also progressed to improve the energy efficiency of rolling stock fleets. Operators...
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