EPE Association: EPE 1991 - 05 - Session 1.5: TRACTION

EPE 1991 - 05 - Session 1.5: TRACTION
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1991 - Conference > EPE 1991 - 05 - Session 1.5: TRACTION

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   VERIFICATION OF AN ON-LINE SIMULATOR FOR VSl-IM RAIL TRACTION DRIVES
By R. J. Hill; F. Huang [View]
[Download]

Abstract: An on-line simulator for DC-fed, VSl-IM rail traction drives has been created using a parallel computer. The simulator implements a D-Q axis transient model and produces time domain outputs of the system voltages & currents. torque and speed as the drive accelerates through a typical traction duty cycle. FFT spectra are available of all the time waveforms at user-defined windows. This paper describes the verification of the simulator. This is achieved by comparing simulated results of the harmonic spectra of the system variables with those obtained by measurements on a small-scala laboratory model. The simulated and experimental results reported in the paper occur near a modulation step change and are in agreement within the bounds of experimental error.

   MODELLING AND CONTROL OF A 4-QUADRANT PULSE MODULATED LINESIDE CONVERTER FOR 25 kV, 50 Hz-SUPPLIED TRACTION EQUIPMENT
By L. J. J. Offringa; W. A. G. de Jager; F. van Overbeeke [View]
[Download]

Abstract: The pre-design of a 800 kVA, 50 Hz line-side pulse modulated converter for traction equipment is described. The design procedure has been supported by modelling of the control system, computer simulation and measurements on a scaled 5 kW laboratory test model. A special pulse pattern is described, which enables the operation with a relatively high modulation frequency of 900 Hz with accept able switching losses. A combination of active and passive filtering is used for the suppression of line-currents with signalling frequencies. The measurement results from the scaled laboratory model are given; they serve as a design guide for the 800 kVA version of the converter.

   INFLUENCE OF THE DISTRIBUTION IRREGULARITY IN THE COILS OF LINEAR SYNCHRONOUS MOTOR FOR MAGLEV
By S. Fujiwara [View]
[Download]

Abstract: Superconducting Maglev system adopts primary ground linear synchronous motor for its propulsion. This paper deals with the influence of the distribution irregularity of the coils in the direction of progress. Two groups of irregularity are considered; one extends over long range and the other is localized in small range. Thrust deterioration and unnecessary side force acting on the superconducting field coil are investigated using 4 cases of numerical examples. It is found that: (1) Short range irregularities can be tolerated. (2) Long range irregularities easily have influences on train thrust.

   COMPARISON OF CONTROL CONCEPTS FOR THE POWER SUPPLY FOR RAILWAY PASSENGER CARS
By Felix A. Himmelstoss; Helmut W. Sommer; Franz C. Zach [View]
[Download]

Abstract: This paper compares the control methods for the power circuit of a battery charger using IGBTs for the power supply of railway passenger cars. Two structures are discussed for the power circuit: (1) the voltage source push-pull converter (VSPPC) and (2) the current source push-pull converter (CSPPC). From a controls point of view both systems have equivalent structures. Using the state space representation we easily can calculate the transfer function between output voltage and duty ratio or between output current and duty cycle. These can then be used for dimensioning the controller. Single loop and two kinds of two-loop control structures are investigated, the controller concepts are compared and guidelines for the selection of the concept are explained. Furthermore, root locus diagrams and simulation of the systems behavior are shown for a 220A battery charger.

   DESIGN AND CONTROL OF SYNCHRONOUS WHEELCHAIR DRIVE
By J. Jelonkiewicz; A. Jonsson [View]
[Download]

Abstract: The paper presents a study of a synchronous motor fed by a power electronic inverter used as a wheelchair drive. The main purpose of this work is to exchange existing DC drives in the wheelchairs, which are not satisfying, into the synchronous motor drives. A power electronic inverter using MOSFETs is described. The controlling circuit, based on hysteresis technique, allows one to generate perfect sinus current in a wide output frequency range. For the torque adjustment, authors take under consideration different kinds of controlling algorythms, trying to find simple and efficient method, using sensors other then optical speed/position encoders.

   A DIGITAL CONTROL LINE FOR TRACTION PURPOSE: TESTING PERFORMANCES
By C. Attaianese; R. Di Stefano; G. Manco; M. Scarano [View]
[Download]

Abstract: The paper deals with the lab-testing of a prototype of a traction asynchronous drive. This original drive consists of a microprocessor control, a PWM inverter and a squirrel cage induction motor. A feeding algorithm suitable to fix the value of the rotor flux has been considered and different electromechanical functions have been implemented to give particular steering expectations. For testing drive capabilities a first prototype was built up by using a PC controller. In this second prototype, control performances have been improved and the whole digital system has been assembled on single board. Set of complete lab-tests are in course of finishing.

   COMPUTER-AIDED ANALYSIS AND DESIGN OF TRACTION DC DRIVES: APPLICATION TO EN-57T ELECTRICAL MULTIPLE UNIT OF THE POLISH STATE RAILWAYS
By P. Janiszewski; A. M. Walczyna [View]
[Download]

Abstract: In the paper a brief state-of-the-art in CAD of converters is presented with special focus on traction applications. Recent works on modelling of thyristors are discussed. Brief survey of CAD of traction converters and drives with use of SPICE-2 program is done. Main features of recently developed special packages for power electronic circuits analysis are discussed. On the basis of the above survey advantages of NAP-2 (Nonlinear Analysis Program) software package in application to power electronic circuit analysis are shown. Simulation model of a traction 3kV chopper for the EN-57 electrical multiple unit is presented. Results of simulation of this chopper using NAP-2 program are quoted. Simulation results are compared with experimental ones measured on a prototype chopper vehicle.

   THREE LEVEL INVERTER DSC CONTROL STRATEGY FOR TRACTION DRIVES: PART II - COMPARISON BETWEEN DC-LINK CURRENT AND TORQUE HARMONICS GENERATED BY PWM CONTROL
By V. Cascone; L. Mantica; M. Oberti [View]
[Download]

Abstract: The analysis of the three-level inverter controlled by DSC strategy has been investigated by global performance comparison with the sinusoidal Pulsewidth Modulation method: this modulator gives good results and it's implementation in an indirect torque / flux regulator for induction motors could be evaluated. The reduction of the harmonic contents of their shift in a higher frequency range, obtained with the DSC controller, in both DC-link current and torque, are clearly shown in the simulation results.

   TRANSISTOR-INVERTER EQUIPMENT FOR INVIDUAL WHEEL DRIVEN LOW FLOOR TRAMS
By Gerhard Sartor [View]
[Download]

Abstract: A new water-cooled PWM inverter to supply the three phase traction motor driving an invidual wheel propulsion of a tram has been developed. The inverter is of the neutral point clamped type, working with a rated overhead line voltage of 750 V DC. Switching elements are bipolar transistor modules, mounted on a water cooled plate. Drive units check the conduction state of the connected transistor and generate a feedback signal. Based on these signals pulse sequencing, short-circuit and failure detection is done by a protection unit. Detailed information about the kind of failure will be stored for fault location purpose. The equipment is designed to be mounted on the roof of the tram.

EPE 1991 - 05 - Session 1.5: TRACTION
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1991 - Conference > EPE 1991 - 05 - Session 1.5: TRACTION
	[return to parent folder]

	VERIFICATION OF AN ON-LINE SIMULATOR FOR VSl-IM RAIL TRACTION DRIVES By R. J. Hill; F. Huang	[View] [Download]
Abstract: An on-line simulator for DC-fed, VSl-IM rail traction drives has been created using a parallel computer. The simulator implements a D-Q axis transient model and produces time domain outputs of the system voltages & currents. torque and speed as the drive accelerates through a typical traction duty cycle. FFT spectra are available of all the time waveforms at user-defined windows. This paper describes the verification of the simulator. This is achieved by comparing simulated results of the harmonic spectra of the system variables with those obtained by measurements on a small-scala laboratory model. The simulated and experimental results reported in the paper occur near a modulation step change and are in agreement within the bounds of experimental error.

	MODELLING AND CONTROL OF A 4-QUADRANT PULSE MODULATED LINESIDE CONVERTER FOR 25 kV, 50 Hz-SUPPLIED TRACTION EQUIPMENT By L. J. J. Offringa; W. A. G. de Jager; F. van Overbeeke	[View] [Download]
Abstract: The pre-design of a 800 kVA, 50 Hz line-side pulse modulated converter for traction equipment is described. The design procedure has been supported by modelling of the control system, computer simulation and measurements on a scaled 5 kW laboratory test model. A special pulse pattern is described, which enables the operation with a relatively high modulation frequency of 900 Hz with accept able switching losses. A combination of active and passive filtering is used for the suppression of line-currents with signalling frequencies. The measurement results from the scaled laboratory model are given; they serve as a design guide for the 800 kVA version of the converter.

	INFLUENCE OF THE DISTRIBUTION IRREGULARITY IN THE COILS OF LINEAR SYNCHRONOUS MOTOR FOR MAGLEV By S. Fujiwara	[View] [Download]
Abstract: Superconducting Maglev system adopts primary ground linear synchronous motor for its propulsion. This paper deals with the influence of the distribution irregularity of the coils in the direction of progress. Two groups of irregularity are considered; one extends over long range and the other is localized in small range. Thrust deterioration and unnecessary side force acting on the superconducting field coil are investigated using 4 cases of numerical examples. It is found that: (1) Short range irregularities can be tolerated. (2) Long range irregularities easily have influences on train thrust.

	COMPARISON OF CONTROL CONCEPTS FOR THE POWER SUPPLY FOR RAILWAY PASSENGER CARS By Felix A. Himmelstoss; Helmut W. Sommer; Franz C. Zach	[View] [Download]
Abstract: This paper compares the control methods for the power circuit of a battery charger using IGBTs for the power supply of railway passenger cars. Two structures are discussed for the power circuit: (1) the voltage source push-pull converter (VSPPC) and (2) the current source push-pull converter (CSPPC). From a controls point of view both systems have equivalent structures. Using the state space representation we easily can calculate the transfer function between output voltage and duty ratio or between output current and duty cycle. These can then be used for dimensioning the controller. Single loop and two kinds of two-loop control structures are investigated, the controller concepts are compared and guidelines for the selection of the concept are explained. Furthermore, root locus diagrams and simulation of the systems behavior are shown for a 220A battery charger.

	DESIGN AND CONTROL OF SYNCHRONOUS WHEELCHAIR DRIVE By J. Jelonkiewicz; A. Jonsson	[View] [Download]
Abstract: The paper presents a study of a synchronous motor fed by a power electronic inverter used as a wheelchair drive. The main purpose of this work is to exchange existing DC drives in the wheelchairs, which are not satisfying, into the synchronous motor drives. A power electronic inverter using MOSFETs is described. The controlling circuit, based on hysteresis technique, allows one to generate perfect sinus current in a wide output frequency range. For the torque adjustment, authors take under consideration different kinds of controlling algorythms, trying to find simple and efficient method, using sensors other then optical speed/position encoders.

	A DIGITAL CONTROL LINE FOR TRACTION PURPOSE: TESTING PERFORMANCES By C. Attaianese; R. Di Stefano; G. Manco; M. Scarano	[View] [Download]
Abstract: The paper deals with the lab-testing of a prototype of a traction asynchronous drive. This original drive consists of a microprocessor control, a PWM inverter and a squirrel cage induction motor. A feeding algorithm suitable to fix the value of the rotor flux has been considered and different electromechanical functions have been implemented to give particular steering expectations. For testing drive capabilities a first prototype was built up by using a PC controller. In this second prototype, control performances have been improved and the whole digital system has been assembled on single board. Set of complete lab-tests are in course of finishing.

	COMPUTER-AIDED ANALYSIS AND DESIGN OF TRACTION DC DRIVES: APPLICATION TO EN-57T ELECTRICAL MULTIPLE UNIT OF THE POLISH STATE RAILWAYS By P. Janiszewski; A. M. Walczyna	[View] [Download]
Abstract: In the paper a brief state-of-the-art in CAD of converters is presented with special focus on traction applications. Recent works on modelling of thyristors are discussed. Brief survey of CAD of traction converters and drives with use of SPICE-2 program is done. Main features of recently developed special packages for power electronic circuits analysis are discussed. On the basis of the above survey advantages of NAP-2 (Nonlinear Analysis Program) software package in application to power electronic circuit analysis are shown. Simulation model of a traction 3kV chopper for the EN-57 electrical multiple unit is presented. Results of simulation of this chopper using NAP-2 program are quoted. Simulation results are compared with experimental ones measured on a prototype chopper vehicle.

	THREE LEVEL INVERTER DSC CONTROL STRATEGY FOR TRACTION DRIVES: PART II - COMPARISON BETWEEN DC-LINK CURRENT AND TORQUE HARMONICS GENERATED BY PWM CONTROL By V. Cascone; L. Mantica; M. Oberti	[View] [Download]
Abstract: The analysis of the three-level inverter controlled by DSC strategy has been investigated by global performance comparison with the sinusoidal Pulsewidth Modulation method: this modulator gives good results and it's implementation in an indirect torque / flux regulator for induction motors could be evaluated. The reduction of the harmonic contents of their shift in a higher frequency range, obtained with the DSC controller, in both DC-link current and torque, are clearly shown in the simulation results.

	TRANSISTOR-INVERTER EQUIPMENT FOR INVIDUAL WHEEL DRIVEN LOW FLOOR TRAMS By Gerhard Sartor	[View] [Download]
Abstract: A new water-cooled PWM inverter to supply the three phase traction motor driving an invidual wheel propulsion of a tram has been developed. The inverter is of the neutral point clamped type, working with a rated overhead line voltage of 750 V DC. Switching elements are bipolar transistor modules, mounted on a water cooled plate. Drive units check the conduction state of the connected transistor and generate a feedback signal. Based on these signals pulse sequencing, short-circuit and failure detection is done by a protection unit. Detailed information about the kind of failure will be stored for fault location purpose. The equipment is designed to be mounted on the roof of the tram.