EPE Association: EPE-PEMC 2004 - Topic 12-4: Adjustable speed generation systems

EPE-PEMC 2004 - Topic 12-4: Adjustable speed generation systems
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2004 - Conference > EPE-PEMC 2004 - Topic 12: POWER ELECTRONICS IN GENERATION, TRANSMISSION AND DISTRIBUTION OF ELECTRICAL ENERGY > EPE-PEMC 2004 - Topic 12-4: Adjustable speed generation systems

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   Doubly Fed Induction Generators Active And Reactive Power Control
By Angela Cristina S. L. Guimaraes, Francisco De Assis Dos Santos Neves, Manoel A. Carvalho Jr, Marcelo Cabral Cavalcanti, Zanoni Dueire Lins [View]
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Abstract: In this paper a control scheme for doubly fed induction generators for wind turbines is presented. The stator is directly connected to the power system grid while the rotor is fed via an AC/DC/AC converter. The power system side converter is modeled and controlled using a voltage vector oriented dq reference frame. Thus, the d axis current component can be used to control the active power delivered to the converter and, consequently, to regulate the DC bus voltage. The q axis current component is forced to zero in order to achieve unity power factor. The side of the converter connected to the induction machine rotor is controlled to allow real and reactive generated powers to be independently imposed. A stator flux oriented control scheme is used.

   Experimental Trials Of Different Maximum Power Tracking Control Strategies Of A Variable Speed Wind Turbine
By H. Camblong, I. Martinez De Alegria, M. Rodriguez, G. Abad [View]
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Abstract: In this paper, the analysis of a Direct and an Indirect Speed Control of a Variable Speed Wind Turbine in the maximum power tracking operating zone is presented. The main objective in this operating zone is to obtain the best aerodynamic efficiency as possible, and thus, to decrease the cost of wind energy. After a description of the studied system, the test bench and the considered control strategies, the controllers are tested on the 18 kW experimental rig. Different tools are used to evaluate the trials results. These results show that the DSC induces a better aerodynamic efficiency but with higher power and drive torque fluctuations.

   Multi Source Hybryd Power Plant With Power Electronic Converters And High Quality AC Output Voltage
By Lech M. Grzesiak [View]
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Abstract: In this paper a new concept of multi source hybrid system configuration is proposed. The system comprises two energy sources. The primary energy source is the standard generator operated with constant speed driven by steam turbine. The secondary energy source is a diesel engine-driven PM alternator operated by variable speed. Mathematical models of all subsystems are described, and are finally integrated into a complex model of the whole system. The dynamic behaviour of the system under several step-loads is analysed and discussed. Computer simulation results are presented.

   Quality Of Power Produced By Variable Speed Generation System
By Wlodzimierz Koczara, Emil Ernest, Nazar Al-Khayat [View]
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Abstract: The paper describes the performance of a variable speed power generating set driven by a diesel engine. The generating set is equipped with an axial flux permanent magnet generator, power electronic converter and DSP control system. The generating system produces adjustable output voltage and supply frequency independent of the generator set engine speed or the load magnitude or characteristics. The Power Electronic Converter (PEC) decuples the generator output from the load voltage. There are two states of system operation: autonomous stand alone and parallel with the grid. Since the voltage waveform from the grid is distorted the generating system voltage has to be adjusted to provide quality of demanded current. If the grid power is lost, the variable speed set will change to island operation. The quality of the output voltage produced by the variable speed generating set is high. The paper presents the principles of operation of the variable speed generating set and will discuss performance tests related to 40kVA genset.

EPE-PEMC 2004 - Topic 12-4: Adjustable speed generation systems
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2004 - Conference > EPE-PEMC 2004 - Topic 12: POWER ELECTRONICS IN GENERATION, TRANSMISSION AND DISTRIBUTION OF ELECTRICAL ENERGY > EPE-PEMC 2004 - Topic 12-4: Adjustable speed generation systems
	[return to parent folder]

	Doubly Fed Induction Generators Active And Reactive Power Control By Angela Cristina S. L. Guimaraes, Francisco De Assis Dos Santos Neves, Manoel A. Carvalho Jr, Marcelo Cabral Cavalcanti, Zanoni Dueire Lins	[View] [Download]
Abstract: In this paper a control scheme for doubly fed induction generators for wind turbines is presented. The stator is directly connected to the power system grid while the rotor is fed via an AC/DC/AC converter. The power system side converter is modeled and controlled using a voltage vector oriented dq reference frame. Thus, the d axis current component can be used to control the active power delivered to the converter and, consequently, to regulate the DC bus voltage. The q axis current component is forced to zero in order to achieve unity power factor. The side of the converter connected to the induction machine rotor is controlled to allow real and reactive generated powers to be independently imposed. A stator flux oriented control scheme is used.

	Experimental Trials Of Different Maximum Power Tracking Control Strategies Of A Variable Speed Wind Turbine By H. Camblong, I. Martinez De Alegria, M. Rodriguez, G. Abad	[View] [Download]
Abstract: In this paper, the analysis of a Direct and an Indirect Speed Control of a Variable Speed Wind Turbine in the maximum power tracking operating zone is presented. The main objective in this operating zone is to obtain the best aerodynamic efficiency as possible, and thus, to decrease the cost of wind energy. After a description of the studied system, the test bench and the considered control strategies, the controllers are tested on the 18 kW experimental rig. Different tools are used to evaluate the trials results. These results show that the DSC induces a better aerodynamic efficiency but with higher power and drive torque fluctuations.

	Multi Source Hybryd Power Plant With Power Electronic Converters And High Quality AC Output Voltage By Lech M. Grzesiak	[View] [Download]
Abstract: In this paper a new concept of multi source hybrid system configuration is proposed. The system comprises two energy sources. The primary energy source is the standard generator operated with constant speed driven by steam turbine. The secondary energy source is a diesel engine-driven PM alternator operated by variable speed. Mathematical models of all subsystems are described, and are finally integrated into a complex model of the whole system. The dynamic behaviour of the system under several step-loads is analysed and discussed. Computer simulation results are presented.

	Quality Of Power Produced By Variable Speed Generation System By Wlodzimierz Koczara, Emil Ernest, Nazar Al-Khayat	[View] [Download]
Abstract: The paper describes the performance of a variable speed power generating set driven by a diesel engine. The generating set is equipped with an axial flux permanent magnet generator, power electronic converter and DSP control system. The generating system produces adjustable output voltage and supply frequency independent of the generator set engine speed or the load magnitude or characteristics. The Power Electronic Converter (PEC) decuples the generator output from the load voltage. There are two states of system operation: autonomous stand alone and parallel with the grid. Since the voltage waveform from the grid is distorted the generating system voltage has to be adjusted to provide quality of demanded current. If the grid power is lost, the variable speed set will change to island operation. The quality of the output voltage produced by the variable speed generating set is high. The paper presents the principles of operation of the variable speed generating set and will discuss performance tests related to 40kVA genset.