EPE Association: EPE 1989 - 33 - Dialogue Session 1.6: TRACTION

EPE 1989 - 33 - Dialogue Session 1.6: TRACTION
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   TRACTION EQUIPMENT MODELLING FOR AC AND DC SUPPLIED RAILWAY SYSTEMS USING DC DRIVES
By N. B. Rambukwella; B. Mellit; W. S. Chan [View]
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Abstract: This paper describes the development of voltage sensitive, speed and load dependent traction equipment models for both d.c. and a.c. fed railway systems, which use d.c. traction motors. The modelling techniques adopted gives an equivalent circuit model which permit piecewise linear system theory to be used for fast and efficient solution of the supply network. The 'modular' approach used also facilitates the incorporation of changes in both traction equipment and control strategy.

   ON-LINE IDENTIFICATION OF THE RESONANCE CONDITIONS IN THE OVERHEAD SUPPLY LINE OF ELECTRIC RAILWAYS
By Joachim Holtz; Jens Onno Krah [View]
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Abstract: The overhead supply line of an electric railway system exhibits resonating properties at various frequencies. The eigenfrequencies are a function of the track topography. They change as traction vehicles move along the track. Electrical oscillations in the line are excited by the current harmonics of modern PWM converter-fed locomotives. A real-time model of an extended system of railway tracks, substations and locomotives serves to study the resonance phenomena under the influence of various parameters. Further, a method is developed to identify on board a converter-fed locomotive in real-time the eigenvalues of the overhead supply system and at each eigenfrequency the actual amount of oscillating energy. The identification provides the information for possible suppression of harmonic excitation by an appropriate converter control.

   HIGH-PERFORMANCE FIELD BUS FOR A DISTRIBUTED TRACTION CONTROL SYSTEM
By W. Marsden; F. Zurfluh [View]
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Abstract: The next generation MICAS-S2 automatic control system features a distributed architecture connected together via a tailor made high performance field bus. The communication principle of source addressed message broadcasting in real time and service accessing from one central point is supported by an application specific integrated circuit (ASIC) design, thus relieving the device micro-processor from bus duties. The high net data rate of up to 1 Mbit/s and the high data integrity together with built-in fault tolerance and a high system reliability are just a few of the features which make the fieldbus so suitable for a traction control applicatlon. Using one serial bus as backbone for the whole distributed architecture saves connections between individual devices while contributing towards a neat solution with a determined fault tolerance. Specially designed tools facilitate programming, eliminate sources of error and contribute towards a structered signal flow. The Swiss Federal Railways project Bahn 2000 will be the first to make use of this new MICAS distributed control system technology.

   A 4000 V - 800 A GTO CHOPPER FOR TRACTION APPLICATIONS
By S. Saadate; R. Ie Doeuff; R. Periot [View]
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Abstract: In the present state of development of GTO thyristor technology the series connection of these semiconductors is unavoidable when a high voltage convertor, in our case a 4000V chopper, is aimed. Two large GTOs (4,5 kv - 2,5 kv) are series connected in the experimental chopper. The RMS value of chopper current is 800 A. The paper will consider the criterions for the selection of GTOs, design of snubbers and adeptation of GTOs control signals. The advantages and drawbacks of the used strategie will be discussed. The detailed experimental results concerning the influence of different parameters such as load current on the transient and steady state voltage distribution on the GTOs will accomplish the paper. These results make us believe that a 5 kv chopper is conceivable from now on. As this chopper is supposed to be used in rail traction, some industrial realizations are given at the end.

EPE 1989 - 33 - Dialogue Session 1.6: TRACTION
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1989 - Conference > EPE 1989 - 33 - Dialogue Session 1.6: TRACTION
	[return to parent folder]

	TRACTION EQUIPMENT MODELLING FOR AC AND DC SUPPLIED RAILWAY SYSTEMS USING DC DRIVES By N. B. Rambukwella; B. Mellit; W. S. Chan	[View] [Download]
Abstract: This paper describes the development of voltage sensitive, speed and load dependent traction equipment models for both d.c. and a.c. fed railway systems, which use d.c. traction motors. The modelling techniques adopted gives an equivalent circuit model which permit piecewise linear system theory to be used for fast and efficient solution of the supply network. The 'modular' approach used also facilitates the incorporation of changes in both traction equipment and control strategy.

	ON-LINE IDENTIFICATION OF THE RESONANCE CONDITIONS IN THE OVERHEAD SUPPLY LINE OF ELECTRIC RAILWAYS By Joachim Holtz; Jens Onno Krah	[View] [Download]
Abstract: The overhead supply line of an electric railway system exhibits resonating properties at various frequencies. The eigenfrequencies are a function of the track topography. They change as traction vehicles move along the track. Electrical oscillations in the line are excited by the current harmonics of modern PWM converter-fed locomotives. A real-time model of an extended system of railway tracks, substations and locomotives serves to study the resonance phenomena under the influence of various parameters. Further, a method is developed to identify on board a converter-fed locomotive in real-time the eigenvalues of the overhead supply system and at each eigenfrequency the actual amount of oscillating energy. The identification provides the information for possible suppression of harmonic excitation by an appropriate converter control.

	HIGH-PERFORMANCE FIELD BUS FOR A DISTRIBUTED TRACTION CONTROL SYSTEM By W. Marsden; F. Zurfluh	[View] [Download]
Abstract: The next generation MICAS-S2 automatic control system features a distributed architecture connected together via a tailor made high performance field bus. The communication principle of source addressed message broadcasting in real time and service accessing from one central point is supported by an application specific integrated circuit (ASIC) design, thus relieving the device micro-processor from bus duties. The high net data rate of up to 1 Mbit/s and the high data integrity together with built-in fault tolerance and a high system reliability are just a few of the features which make the fieldbus so suitable for a traction control applicatlon. Using one serial bus as backbone for the whole distributed architecture saves connections between individual devices while contributing towards a neat solution with a determined fault tolerance. Specially designed tools facilitate programming, eliminate sources of error and contribute towards a structered signal flow. The Swiss Federal Railways project Bahn 2000 will be the first to make use of this new MICAS distributed control system technology.

	A 4000 V - 800 A GTO CHOPPER FOR TRACTION APPLICATIONS By S. Saadate; R. Ie Doeuff; R. Periot	[View] [Download]
Abstract: In the present state of development of GTO thyristor technology the series connection of these semiconductors is unavoidable when a high voltage convertor, in our case a 4000V chopper, is aimed. Two large GTOs (4,5 kv - 2,5 kv) are series connected in the experimental chopper. The RMS value of chopper current is 800 A. The paper will consider the criterions for the selection of GTOs, design of snubbers and adeptation of GTOs control signals. The advantages and drawbacks of the used strategie will be discussed. The detailed experimental results concerning the influence of different parameters such as load current on the transient and steady state voltage distribution on the GTOs will accomplish the paper. These results make us believe that a 5 kv chopper is conceivable from now on. As this chopper is supposed to be used in rail traction, some industrial realizations are given at the end.