EPE Association: EPE 2001 - Topic 10e: Adjustable Speed Generation Systems

EPE 2001 - Topic 10e: Adjustable Speed Generation Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2001 - Conference > EPE 2001 - Topic 10: POWER ELECTRONICS IN GENERATION, TRANSMISSION AND DISTRIBUTION OF ELECTRICAL ENERGY > EPE 2001 - Topic 10e: Adjustable Speed Generation Systems

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   Active damping of flux oscillations in doubly-fed AC machines
By C. Roberto Kelber; W. Schumacher [View]
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Abstract: Due to limited range of speed adjustment and reduced costs of the converter doubly-fed AC machines are becoming more common in hydroelectric power plants with adjustable speed constant frequency energy generation systems. Unfortunately under some operating conditions, the stator flux in this machine begins to oscillate. The oscillations are poorly damped, and if the stability limits are reached they cannot be damped without an external influence. In this article the fundamentals of the active damping of the flux in doubly-fed AC machines using an additional inverter connected in series with the stator’s open star point will be presented. Experimental results obtained with a 33kW test rig are included.

   Modeling and dynamic simulation of variable speed pump storage units
By K. Grotenburg; F. Koch; I. Erlich; U. Bachmann [View]
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Abstract: This paper deals with the modeling of variable speed pump storage power plant units equipped with double fed induction machine drives. The model is intended for use in a multi-machine simulation environment. The intention is to investigate the dynamic interaction between large variable speed units and the interconnected power system. First, a reduced order model of the double fed machine is developed. Based on this, a systematic multivariable controller design with dead-beat controller approach and terminal voltage compensation is carried out. The model is completed by voltage, power and speed controllers. Simulation results show the dynamic behavior of the new Goldisthal variable speed units in the German electrical power system.

   Sensorless Field-Oriented Control of a Slipring Induction Generator
By U. Rädel; D. Navarro; G. Berger; S.Berg [View]
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Abstract: A field-oriented control of a slipring induction generator without speed sensor is introduced. The principle of the control and practical results of a 2.5 MW-Drive and a 30 kW laboratory set are shown. At first some basic equations to the slipring induction generator are introduced. The internal rotor current control loops are presented as well as the higher-level control loops. It is distinguish between the isolated operation, the mains-coupled operation and the synchronization procedure of the stator voltage. A model to calculate the flux and one to calculate the speed are incorporated at the paper. Note, that the using of a speed model is unusual at the present available slipring drives at the windpower market. The presented figures with results are mostly of the 2.5 MW-Drive, except the two figures, where it is explicit mentioned.

   Variable Speed Three Phase Generation Set
By W. Koczara; J. Leonarski; R. Dziuba; N. Al-Khayat; N. Jakeman [View]
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Abstract: This paper is focused on the industrial development of a novel type variable speed power generating system that can be used for the supply of electrical loads in the range 10kVA to 100kVA. Variable- Speed-Integrated-Generating (VSIG) sets consist of a diesel engine, an axial type permanent magnet generator and high frequency power converter that is IGBT based. The axial type PMG has proved to be the best candidate for variable speed application. The power to weight ratio of the set is significantly more than traditional sets incorporating a wound field synchronous generator. Mechanical integration of the generator and engine must consider torque pulsation and axial thrust. The unique feature of the control system is the control algorithm which ensures fast response of the system to load application and accurate mapping of engine torque with load current.

EPE 2001 - Topic 10e: Adjustable Speed Generation Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2001 - Conference > EPE 2001 - Topic 10: POWER ELECTRONICS IN GENERATION, TRANSMISSION AND DISTRIBUTION OF ELECTRICAL ENERGY > EPE 2001 - Topic 10e: Adjustable Speed Generation Systems
	[return to parent folder]

	Active damping of flux oscillations in doubly-fed AC machines By C. Roberto Kelber; W. Schumacher	[View] [Download]
Abstract: Due to limited range of speed adjustment and reduced costs of the converter doubly-fed AC machines are becoming more common in hydroelectric power plants with adjustable speed constant frequency energy generation systems. Unfortunately under some operating conditions, the stator flux in this machine begins to oscillate. The oscillations are poorly damped, and if the stability limits are reached they cannot be damped without an external influence. In this article the fundamentals of the active damping of the flux in doubly-fed AC machines using an additional inverter connected in series with the stator’s open star point will be presented. Experimental results obtained with a 33kW test rig are included.

	Modeling and dynamic simulation of variable speed pump storage units By K. Grotenburg; F. Koch; I. Erlich; U. Bachmann	[View] [Download]
Abstract: This paper deals with the modeling of variable speed pump storage power plant units equipped with double fed induction machine drives. The model is intended for use in a multi-machine simulation environment. The intention is to investigate the dynamic interaction between large variable speed units and the interconnected power system. First, a reduced order model of the double fed machine is developed. Based on this, a systematic multivariable controller design with dead-beat controller approach and terminal voltage compensation is carried out. The model is completed by voltage, power and speed controllers. Simulation results show the dynamic behavior of the new Goldisthal variable speed units in the German electrical power system.

	Sensorless Field-Oriented Control of a Slipring Induction Generator By U. Rädel; D. Navarro; G. Berger; S.Berg	[View] [Download]
Abstract: A field-oriented control of a slipring induction generator without speed sensor is introduced. The principle of the control and practical results of a 2.5 MW-Drive and a 30 kW laboratory set are shown. At first some basic equations to the slipring induction generator are introduced. The internal rotor current control loops are presented as well as the higher-level control loops. It is distinguish between the isolated operation, the mains-coupled operation and the synchronization procedure of the stator voltage. A model to calculate the flux and one to calculate the speed are incorporated at the paper. Note, that the using of a speed model is unusual at the present available slipring drives at the windpower market. The presented figures with results are mostly of the 2.5 MW-Drive, except the two figures, where it is explicit mentioned.

	Variable Speed Three Phase Generation Set By W. Koczara; J. Leonarski; R. Dziuba; N. Al-Khayat; N. Jakeman	[View] [Download]
Abstract: This paper is focused on the industrial development of a novel type variable speed power generating system that can be used for the supply of electrical loads in the range 10kVA to 100kVA. Variable- Speed-Integrated-Generating (VSIG) sets consist of a diesel engine, an axial type permanent magnet generator and high frequency power converter that is IGBT based. The axial type PMG has proved to be the best candidate for variable speed application. The power to weight ratio of the set is significantly more than traditional sets incorporating a wound field synchronous generator. Mechanical integration of the generator and engine must consider torque pulsation and axial thrust. The unique feature of the control system is the control algorithm which ensures fast response of the system to load application and accurate mapping of engine torque with load current.