EPE Association: EPE 1995 - 07 - Lecture Session L2c: CONVERTERS FOR TRACTION

EPE 1995 - 07 - Lecture Session L2c: CONVERTERS FOR TRACTION
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1995 - Conference > EPE 1995 - 07 - Lecture Session L2c: CONVERTERS FOR TRACTION

   [return to parent folder]

   A BI-DIRECTIONAL RECTIFIER FOR USE WITH A VOLTAGE FED INVERTER IN A HIGH PERFORMANCE VARIABLE SPEED AC MOTOR DRIVE SYSTEM
By Patrick W. Wheeler; Jon C. Clare; Mark Sumner [View]
[Download]

Abstract: This paper describes the optimised design, building and operation of a novel bidirectional rectifier for use with inverter circuits in variable speed AC drives. The Circuit consists of a controllable three phase thyristor bridge and a reconfigurable DC to DC converter, operating under average current mode control. The rectifier is used with a vector controlled inverter drive to demonstrate the capabilities of the system. Simulation and practical results are presented.

   A MAGNETICALLY COUPLED REGENERATIVE TURN-OFF SNUBBER
By D. Simonetti; F. Ubano; V. Canalli; J. Sebastian; J. Uceda [View]
[Download]

Abstract: A magnetically coupled regenerative tum-off snubber is presented in this paper. Its main feature is that it regenerates the energy stored in the snubber capacitor to the output (or input) voltage using a transformer mounted on an inductor of the converter. Opposite to other known tum-off snubber solutions, we do not need an extra magnetic core in the topology. Design equations are presented for a boost converter. Some other converters with the proposed snubber are also shown. The experimental results presented for a boost and a BIFRED converters complete the analysis. The tum-off stresses are reduced, and the efficiency is improved. This snubber can be of interest to be used in many applications which requires simplicity and robustness.

   4000V - 300A EIGHT-LEVEL IGBT INVERTER LEG
By P. Carrere; T. Meynard; J. P. Lavieville [View]
[Download]

Abstract: The application field of the 1200V IGBT devices is usually limited to a dc-link voltage up to about 600V. In order to extend this field, new structures have been developed. In this paper, an inverter leg made of seven nested cells is presented. With this structure, it is possible to increase the dc-link voltage of IGBT inverter up to 4000 V dc and provide a 300 A rms current.

   GTO-PWM INVERTER WITHOUT BRAKE CHOPPER FOR THE TAEGU SUBWAY CARS IN SOUTH KOREA
By A. Lipp [View]
[Download]

Abstract: Modern mass transit vehicles with propulsion system operating in the megawatt range and designed for line voltages of 1500 V DC are being equipped with GTO - PWM inverters today. These propulsion systems are capable of returning surplus power to the line. If the line is not receptive, this power is consumed by a GTO brake chopper plus resistor bank during braking. The subway in South Korea dispenses with such a brake chopper. Consequently the hitherto conventional circuitry is simplified, and cost as well as weight savings are obtained. The essential characteristics of the overall system remain unaffected thanks to skillful control of the PWM inverter and appropriately selective actuation of a protective thyristor. Protection of the system is guaranteed at all times. The particular characteristics of the PWM inverter system are described. Details are given on what the requirements are for the line and vehicle in order to realize the PWM inverter without a brake chopper, how specific components have to be designed, and how the PWM inverter can be protected reliably.

EPE 1995 - 07 - Lecture Session L2c: CONVERTERS FOR TRACTION
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1995 - Conference > EPE 1995 - 07 - Lecture Session L2c: CONVERTERS FOR TRACTION
	[return to parent folder]

	A BI-DIRECTIONAL RECTIFIER FOR USE WITH A VOLTAGE FED INVERTER IN A HIGH PERFORMANCE VARIABLE SPEED AC MOTOR DRIVE SYSTEM By Patrick W. Wheeler; Jon C. Clare; Mark Sumner	[View] [Download]
Abstract: This paper describes the optimised design, building and operation of a novel bidirectional rectifier for use with inverter circuits in variable speed AC drives. The Circuit consists of a controllable three phase thyristor bridge and a reconfigurable DC to DC converter, operating under average current mode control. The rectifier is used with a vector controlled inverter drive to demonstrate the capabilities of the system. Simulation and practical results are presented.

	A MAGNETICALLY COUPLED REGENERATIVE TURN-OFF SNUBBER By D. Simonetti; F. Ubano; V. Canalli; J. Sebastian; J. Uceda	[View] [Download]
Abstract: A magnetically coupled regenerative tum-off snubber is presented in this paper. Its main feature is that it regenerates the energy stored in the snubber capacitor to the output (or input) voltage using a transformer mounted on an inductor of the converter. Opposite to other known tum-off snubber solutions, we do not need an extra magnetic core in the topology. Design equations are presented for a boost converter. Some other converters with the proposed snubber are also shown. The experimental results presented for a boost and a BIFRED converters complete the analysis. The tum-off stresses are reduced, and the efficiency is improved. This snubber can be of interest to be used in many applications which requires simplicity and robustness.

	4000V - 300A EIGHT-LEVEL IGBT INVERTER LEG By P. Carrere; T. Meynard; J. P. Lavieville	[View] [Download]
Abstract: The application field of the 1200V IGBT devices is usually limited to a dc-link voltage up to about 600V. In order to extend this field, new structures have been developed. In this paper, an inverter leg made of seven nested cells is presented. With this structure, it is possible to increase the dc-link voltage of IGBT inverter up to 4000 V dc and provide a 300 A rms current.

	GTO-PWM INVERTER WITHOUT BRAKE CHOPPER FOR THE TAEGU SUBWAY CARS IN SOUTH KOREA By A. Lipp	[View] [Download]
Abstract: Modern mass transit vehicles with propulsion system operating in the megawatt range and designed for line voltages of 1500 V DC are being equipped with GTO - PWM inverters today. These propulsion systems are capable of returning surplus power to the line. If the line is not receptive, this power is consumed by a GTO brake chopper plus resistor bank during braking. The subway in South Korea dispenses with such a brake chopper. Consequently the hitherto conventional circuitry is simplified, and cost as well as weight savings are obtained. The essential characteristics of the overall system remain unaffected thanks to skillful control of the PWM inverter and appropriately selective actuation of a protective thyristor. Protection of the system is guaranteed at all times. The particular characteristics of the PWM inverter system are described. Details are given on what the requirements are for the line and vehicle in order to realize the PWM inverter without a brake chopper, how specific components have to be designed, and how the PWM inverter can be protected reliably.