EPE Association: EPE 1997 – 62: Dialogue Session DS5b-3: TRACTION

EPE 1997 – 62: Dialogue Session DS5b-3: TRACTION - INVERTER/CONVERTER
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 62: Dialogue Session DS5b-3: TRACTION - INVERTER/CONVERTER

   [return to parent folder]

   COMPENSATION OF LOW-FREQUENCY BEAT CURRENT IN TRACTION INVERTER DRIVES USING THE VOLT-SECOND EQUALISATION METHOD
By Z. Salam; C.J. Goodman [View]
[Download]

Abstract: This paper describes the behaviour of an inverter-induction motor drive system fed by a fluctuating DC link voltage. The modulation process between the inverter switching function and the fluctuating DC link generates beat voltages that produce large beat currents as the difference frequency approaches zero. This phenomena causes serious torque pulsation and excessive motor heating. To correct this problem, a new compensation method based on volt-second equalization is proposed. A low-power test rig has been constructed to validate the effectiveness of the compensation method.

   STRESS ANALYSIS OF TRACTION DRIVES
By M.W. Winterling; W. Deleroi; E. Tuinman [View]
[Download]

Abstract: Research to determine lifetime of components of traction drives has become important because customers nowadays require lifetime specifications. One of the factors which influence lifetime are mechanical oscillations, caused by the electrical drive or the wheel rail contact. A procedure has been developed to measure these oscillations on vehicles on track. A guideline for the choice of sensors, experiments, data acquisition and data processing has been given. Measurements show oscillations and their propagation throughout the electrical and mechanical drive.

   State control of a static ·frequency converter decentral railway supply network
By H.-C. Doht; M. Hilscher [View]
[Download]

Abstract: Due to lower network disturbances static frequency converters for railway supply networks are nowadays mostly based on voltage-fed inverters [1]. With standard two or three-level inverter modules Siemens can assemble converters for the 5 to 33 MW power range. The closed-loop control and the modulation strategies of these inverters define the dynamic behaviour at the converter's output side. Especially at critical operating points e.g. short-circuits on the single-phase side, tpe control system has to ensure reliable operation of the converter without interruption until other independant protection devices can react. With a new state controller running on a digital signal processor board the converter can also fulfill these short-circuit requirements without the high overload capability of a rotating machine converter. This paper describes the behaviour of a 7 MW static frequency converter unit for feeding a decentral railway network.

   A PC BASED, LOW COST, REAL-TIME SIMULATOR FOR TRACTION APPLICATION
By Enrico de Paola [View]
[Download]

Abstract: The dream of the developer of embedded systems is to put them into the system they should control and, after some tuning, forget it. Often, the commissioning at customer site reveals unexpected problems which need time to be solved, especially in complex plants. It seems reasonable to have a real - time simulator of the plant to work out and resolve the problem before the commissioning phase. An example of a low cost, real - time simulator for traction application will be given in this article.

   COMPACT INVERTERS FOR SUPPLY TO RAILWAYS
By Helge E. Mordt; Jan O. Gjerde [View]
[Download]

Abstract: Increase in the power ofiGBT makes it feasible to design small 2 - 3 MV A inverters for power supply to railways. Use of a higher switching frequency than for GTO inverters makes it possible to use active filtering techniques for the lower harmonic 'fequencies like 33 1/3 Hz and 82 Y2 Hz. The design of small compact inverters that are transportable is an actual supplement to the larger static inverter based on the GTO.

   MACS ICON - IGBT BASED PROPULSION SYSTEMS
By Anders Lindberg; Waldemar Belwon; Peter Oom [View]
[Download]

Abstract: This paper describes a new generation of propulsion converters, based on IGBT technology, for use in mass transit applications. The propulsion converters have high voltage high current IGBTs, intelligent Gate Drive Units and are controlled by a single board Drive Control Unit with multiprocessors.

EPE 1997 – 62: Dialogue Session DS5b-3: TRACTION - INVERTER/CONVERTER
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 62: Dialogue Session DS5b-3: TRACTION - INVERTER/CONVERTER
	[return to parent folder]

	COMPENSATION OF LOW-FREQUENCY BEAT CURRENT IN TRACTION INVERTER DRIVES USING THE VOLT-SECOND EQUALISATION METHOD By Z. Salam; C.J. Goodman	[View] [Download]
Abstract: This paper describes the behaviour of an inverter-induction motor drive system fed by a fluctuating DC link voltage. The modulation process between the inverter switching function and the fluctuating DC link generates beat voltages that produce large beat currents as the difference frequency approaches zero. This phenomena causes serious torque pulsation and excessive motor heating. To correct this problem, a new compensation method based on volt-second equalization is proposed. A low-power test rig has been constructed to validate the effectiveness of the compensation method.

	STRESS ANALYSIS OF TRACTION DRIVES By M.W. Winterling; W. Deleroi; E. Tuinman	[View] [Download]
Abstract: Research to determine lifetime of components of traction drives has become important because customers nowadays require lifetime specifications. One of the factors which influence lifetime are mechanical oscillations, caused by the electrical drive or the wheel rail contact. A procedure has been developed to measure these oscillations on vehicles on track. A guideline for the choice of sensors, experiments, data acquisition and data processing has been given. Measurements show oscillations and their propagation throughout the electrical and mechanical drive.

	State control of a static ·frequency converter decentral railway supply network By H.-C. Doht; M. Hilscher	[View] [Download]
Abstract: Due to lower network disturbances static frequency converters for railway supply networks are nowadays mostly based on voltage-fed inverters [1]. With standard two or three-level inverter modules Siemens can assemble converters for the 5 to 33 MW power range. The closed-loop control and the modulation strategies of these inverters define the dynamic behaviour at the converter's output side. Especially at critical operating points e.g. short-circuits on the single-phase side, tpe control system has to ensure reliable operation of the converter without interruption until other independant protection devices can react. With a new state controller running on a digital signal processor board the converter can also fulfill these short-circuit requirements without the high overload capability of a rotating machine converter. This paper describes the behaviour of a 7 MW static frequency converter unit for feeding a decentral railway network.

	A PC BASED, LOW COST, REAL-TIME SIMULATOR FOR TRACTION APPLICATION By Enrico de Paola	[View] [Download]
Abstract: The dream of the developer of embedded systems is to put them into the system they should control and, after some tuning, forget it. Often, the commissioning at customer site reveals unexpected problems which need time to be solved, especially in complex plants. It seems reasonable to have a real - time simulator of the plant to work out and resolve the problem before the commissioning phase. An example of a low cost, real - time simulator for traction application will be given in this article.

	COMPACT INVERTERS FOR SUPPLY TO RAILWAYS By Helge E. Mordt; Jan O. Gjerde	[View] [Download]
Abstract: Increase in the power ofiGBT makes it feasible to design small 2 - 3 MV A inverters for power supply to railways. Use of a higher switching frequency than for GTO inverters makes it possible to use active filtering techniques for the lower harmonic 'fequencies like 33 1/3 Hz and 82 Y2 Hz. The design of small compact inverters that are transportable is an actual supplement to the larger static inverter based on the GTO.

	MACS ICON - IGBT BASED PROPULSION SYSTEMS By Anders Lindberg; Waldemar Belwon; Peter Oom	[View] [Download]
Abstract: This paper describes a new generation of propulsion converters, based on IGBT technology, for use in mass transit applications. The propulsion converters have high voltage high current IGBTs, intelligent Gate Drive Units and are controlled by a single board Drive Control Unit with multiprocessors.