EPE Association: EPE 2007 - Subtopic 16-3

EPE 2007 - Subtopic 16-3 - LS: Urban transportation
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2007 - Conference > EPE 2007 - Topic 16: 'Electrical systems in aerospace, space, surface and marine transport' > EPE 2007 - Subtopic 16-3 - LS: Urban transportation

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   Energy Storage System with UltraCaps on Board of Railway Vehicles
By STEINER Michael; KLOHR Markus [View]
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Abstract: The on board energy storage system with Ultracaps for railway vehicles presented in this paper seems to be a reliable technical solution with an enormous energy saving potential. Bombardier Transportation has equipped one bogie of a prototype LRV (light rail vehicle) for the public transportation operator RNV in Mannheim with a MITRAC Energy Saver. Outstanding feature is the daily operation of the energy storage unit in daily passenger service, and this even since September 2003. The experiences are very positive. The measured traction energy saving of approximately 30\% confirmed fully the former calculations. Running the energy storage device on board of a tram brings additionally following benefits: a. a dramatic reduction of the peak power demand b. "catenary free operation" on several hundred meters without power supply from the catenary c. catenary free city center by on board storage and recharging stations Applying the energy storage devices in Metro systems has a similar effect as in case of LRVs. However the savings distribution in the whole system will be a little bit different. Due to higher regeneration capability of metro systems the expected share of the train propulsion saving will be lower. It will be compensated by a considerable reduction of the line losses, especially for systems with low rated catenary voltages (600V or 750V). Very promising are energy storage applications in propulsion systems of Diesel-Electrical Multiple Units (DEMUs). These vehicles lack possibilities to use the braking energy of the train. Energy storage systems on board of DEMUs bring high fuel savings together with the corresponding emission reduction. On top of that the energy storage leads to a booster effect - extra power during acceleration from the storage, by adding the limited weight of the MITRAC Energy Saver.

   New Field Weakening Strategy for AC Machine Drives for Light Traction Vehicles
By PEROUTKA Zdenek; ZEMAN Karel [View]
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Abstract: This paper presents new control strategy of vector-controlled ac machine traction drives intended for light traction vehicles in the field weakening region. Important contribution of the proposed field weakening method is improved drive immunity against oscillations of the input dc-trolley wire filter, because our approach does not use the converter dc-link voltage feedback, as well as possible operation of the traction converter in the overmodulation (close to the six-step mode) with the conventional PWM. Theoretical conclusions and simulation results of both traction drive prototype and laboratory set-up are verified by experiments performed on the designed laboratory prototype of the induction machine trolley-bus drive. The proposed field weakening algorithm is in this paper generalized also for other control strategies - e.g. DTFC with constant switching frequency.

   Traction Power Converter for PEM Fuel Cell Multi-Stack Generator
By DE BERNARDINIS Alexandre; LALLEMAND Richard; COQUERY Gerard; VULTURESCU Bogdan [View]
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Abstract: This paper presents the study, based on technical specifications, of a power converter structure candidate to fuel cell multi-stack association for urban transport applications. This study is carried out in the frame of the French SPACT-80 research project. The converter topology is based on a DC-DC 3-phase IGBT interleaved boost converter which should meet the following relevant criteria: high efficiency, redundancy, minimisation of fuel cell current ripple, compactness, fault handling and strategies for degraded working modes. The degraded working modes which are considered are one fuel cell stack or converter phase out of work, and DC bus voltage fluctuation. The originality of this paper consists in the power converter design and the backup strategies. Converter operation and performances are studied by numerical simulation.

EPE 2007 - Subtopic 16-3 - LS: Urban transportation
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2007 - Conference > EPE 2007 - Topic 16: 'Electrical systems in aerospace, space, surface and marine transport' > EPE 2007 - Subtopic 16-3 - LS: Urban transportation
	[return to parent folder]

	Energy Storage System with UltraCaps on Board of Railway Vehicles By STEINER Michael; KLOHR Markus	[View] [Download]
Abstract: The on board energy storage system with Ultracaps for railway vehicles presented in this paper seems to be a reliable technical solution with an enormous energy saving potential. Bombardier Transportation has equipped one bogie of a prototype LRV (light rail vehicle) for the public transportation operator RNV in Mannheim with a MITRAC Energy Saver. Outstanding feature is the daily operation of the energy storage unit in daily passenger service, and this even since September 2003. The experiences are very positive. The measured traction energy saving of approximately 30\% confirmed fully the former calculations. Running the energy storage device on board of a tram brings additionally following benefits: a. a dramatic reduction of the peak power demand b. "catenary free operation" on several hundred meters without power supply from the catenary c. catenary free city center by on board storage and recharging stations Applying the energy storage devices in Metro systems has a similar effect as in case of LRVs. However the savings distribution in the whole system will be a little bit different. Due to higher regeneration capability of metro systems the expected share of the train propulsion saving will be lower. It will be compensated by a considerable reduction of the line losses, especially for systems with low rated catenary voltages (600V or 750V). Very promising are energy storage applications in propulsion systems of Diesel-Electrical Multiple Units (DEMUs). These vehicles lack possibilities to use the braking energy of the train. Energy storage systems on board of DEMUs bring high fuel savings together with the corresponding emission reduction. On top of that the energy storage leads to a booster effect - extra power during acceleration from the storage, by adding the limited weight of the MITRAC Energy Saver.

	New Field Weakening Strategy for AC Machine Drives for Light Traction Vehicles By PEROUTKA Zdenek; ZEMAN Karel	[View] [Download]
Abstract: This paper presents new control strategy of vector-controlled ac machine traction drives intended for light traction vehicles in the field weakening region. Important contribution of the proposed field weakening method is improved drive immunity against oscillations of the input dc-trolley wire filter, because our approach does not use the converter dc-link voltage feedback, as well as possible operation of the traction converter in the overmodulation (close to the six-step mode) with the conventional PWM. Theoretical conclusions and simulation results of both traction drive prototype and laboratory set-up are verified by experiments performed on the designed laboratory prototype of the induction machine trolley-bus drive. The proposed field weakening algorithm is in this paper generalized also for other control strategies - e.g. DTFC with constant switching frequency.

	Traction Power Converter for PEM Fuel Cell Multi-Stack Generator By DE BERNARDINIS Alexandre; LALLEMAND Richard; COQUERY Gerard; VULTURESCU Bogdan	[View] [Download]
Abstract: This paper presents the study, based on technical specifications, of a power converter structure candidate to fuel cell multi-stack association for urban transport applications. This study is carried out in the frame of the French SPACT-80 research project. The converter topology is based on a DC-DC 3-phase IGBT interleaved boost converter which should meet the following relevant criteria: high efficiency, redundancy, minimisation of fuel cell current ripple, compactness, fault handling and strategies for degraded working modes. The degraded working modes which are considered are one fuel cell stack or converter phase out of work, and DC bus voltage fluctuation. The originality of this paper consists in the power converter design and the backup strategies. Converter operation and performances are studied by numerical simulation.