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2016 International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles & International Transportation Electrification Conference (ESARS-ITEC)
This paper focuses on railway speed profiles and energy efficiency. It examines the train motion equations and proposes a novel procedure to determine a feasible eco-driving technique. The approach proposes to optimize the energy consumption in a railway route by maximizing the coasting phases. The method is applied by a series of successive steps. It finds the sections where coasting driving is applicable...
This paper proposes a new power management strategy based on pq-Theory for fuel cell and electric vehicle applications. Using a modular cascaded converter topology, more than one power source could be combined with capacitors to supply active and reactive power in an efficient manner to the electric motor. The control strategy to separate mean and oscillating active power and reactive power, as well...
Wide bandgap power devices represent a new frontier for More-Electric-Aircraft (MEA) since they can operate with high junction temperature and with reduced switching losses at high switching frequencies. It allows reduction of the cooling system size and high power density. At present the application of wide bandgap devices to MEA power converters is still limited by their rated current. In this paper...
Fuel cells in aircraft applications are gaining more and more interest because of higher possible efficiency and increasing air pollution standards. A necessary supplement is an efficient, lightweight and reliable DC/DC-converter to adjust the weak fuel cell characteristic to the voltage level of buffer batteries and drive inverters. Cosmic radiation, condensation, strict EMIlimits and significantly...
This paper presents the design approach of a power train used in an advanced high-lift system for future aircraft. Aircraft applications require an ultra-light and integrated design leading to an electrical machine with a high power to weight ratio of 2.82 kW/kg. To achieve additional high lift during take-off and landing, air is blown out at the back flaps of the aircraft wings using a turbo compressor...
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...
A power source sizing methodology for a hybrid fuel cell/battery powered domestic ferry is presented in this paper. The sizing objective in this study is to minimize both the system first and operational costs, taking into consideration maintenance and replacement costs of the fuel cell and battery systems. According to the ferry power requirement, different combinations of fuel cell and battery blocks...
High speed Permanent Magnet Synchronous Motors (PMSM) are used in electrical vehicles because of their strong power density. The high speed implies a big electromotive force and requires flux-weakening. Usual control algorithms do flux-weakening by adding negative Id current when the required voltage by the current regulation exceeds the maximum voltage depending on the battery. If the magnet can...
This article describes concept and design of electronic units of remotely navigated vehicle Democar. Article is mainly focused on hardware part of this vehicle. Desribed are systems of this vehicle and their main functions. Also is included cooperation between systems with procedures for safety operation. In last part are shown results of communication between systems and functional results.
The world market of e-scooter is expected to experiment an increase of 15% in Western Europe between 2015 and 2025. In order to push this growth it is needed to develop new low-cost more efficient and reliable drives with high torque to weight ratio. In this paper a new axial-flux switched reluctance motor is proposed in order to accomplish this goal. The motor is constituted by a stator sandwiched...
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...
Power-electronics-based Medium Voltage Direct Current (MVDC) shipboard power systems, consisting of several interconnected feedback-controlled switching converters, suffer from potential degradation of stability induced by negative incremental resistances due to the presence of constant power loads (CPLs). Several bus stabilizing control approaches have been presented in the past. In this work a novel...
Currently used inverter solutions for ship propulsion applications are based in classic voltage source inverter (VSI) topologies, mostly two-level voltages source inverters (2L-VSI) and cascaded H-Bridge voltage source inverters (CHB-VSI) which have became a standard as from the industrial point of view. Nevertheless, modern ship propulsion applications are required to operate under faulty conditions,...
Due to higher specific power density, longer life time and safer operation, super-capacitors (ultra-capacitors or electric double layer capacitors) are being considered in applications of electric vehicles (EVs). This study deals with design of light electric vehicles or even rail vehicle powered by full or partial pure super-capacitors (SCs). The simulation model of the electric vehicles powered...
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...
Mobile robotics is a notable case of high evolution. The robotics community has developed sophisticated analysis and control techniques to meet increasing requirements on the control of motions of mechanical systems. These increasing requirements are motivated by higher performance specifications, an increasing number of degrees-of-freedom. This contribution proposes a controller for motion of the...
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...
The turbo-electric distributed propulsion (TeDP) concept has been proposed to enable future aircraft to meet ambitious, environmental targets as demand for air travel increases. In order to maximize the benefits of TeDP, the use of high temperature superconductors (HTS) has been proposed. Despite being an enabling technology for many future concepts, the use of superconductors in electrical power...
Nowadays fuel cell based vehicles are considered as an environmentally friendly alternative to fossil fuel propelled vehicles. However, despite the advantages associated to fuel cells, there are a number of drawbacks that must be overcome through the design of the control strategy and the powertrain design. The use of power management strategies is intended to reduce the fuel consumption while fulfilling...
Batteries have become the most popular energy storage devices due to several features like high energy density, durability and safety. Nowadays batteries are used in fuel cells based on hybrid electric vehicles, as a zero emissions alternative transportation. In order to size and design the energy management of this type of systems, the designer requires an easy equivalent model of battery. This paper...
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