EPE Association: EPE 2017

EPE 2017 - LS5e: Wind
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 05: Renewable Energy Power Systems > EPE 2017 - LS5e: Wind

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   Impact of Individual Pitch Control on Pitch Actuators in Megawatt Wind Turbines
By Marcel MORISSE [View]
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Abstract: Individual pitch control is seen as a promising control technique for load reduction of the rotor blades in megawatt wind turbines.As the rotor blades are getting bigger and bigger, the asymmetric loads due to wind speed variations across the rotor area are increasing, too. Modern wind turbines include individual pitch actuators for every blade and the control effort is also reasonable. This is why a lot of research has been done on individual blade pitch control strategies and their impact on load reduction and further stress of the mechanical components, such as pitch bearings.The present work shows that individual pitch control is able to reduce mechanical fatigue loads,however, it affects the dynamic loads of the pitch motors and might lead to an increased overall stress of theirpower electronic converters.

   Improved Control Strategies for Three-Phase Four-Leg Virtual Synchronous Generator with Unbalanced Loads
By Jianhua WANG [View]
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Abstract: This paper proposes improved multi-loop control strategies for three-phase four-leg virtual synchronous generator with unbalanced loads. Through the decoupling control of active and reactive power, inverter can simulate the characteristics of synchronous generator, including primary frequency modulation, primary voltage modulation, inertia and excitation characteristics. To improve the dynamic performance of micro-grid, the voltage and current dual-loop is cascaded after the power loop. In addition, to solve the problem of unbalanced voltage and frequency fluctuation in VSG caused by unbalanced load, a variable frequency adaptive resonance control strategy is proposed. The simulation and experiments validate the effectiveness of the proposed control strategy.

   Inverter Loss Analysis and Comparison for a 5 MW Wind Turbine System
By Wataru KITAGAWA [View]
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Abstract: This article presents the losses of a 5 MW wind turbine generating system comprising of a permanent magnet assisted synchronous reluctance generator (PMaSynRG) system as well as an IGBT equipped forced-commutated inverter. In this article, the focus is on the classical 2-level converter and the NPC converter. Their inverter losses using three types of modules were calculated and compared.

   System Restoration using VSC-HVDC connected Offshore Wind Power Plant as Black-Start Unit
By Holger BECKER [View]
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Abstract: This paper presents the possibility of using a point-to-point voltage source converter - high voltage direct current (VSC-HVDC) transmission system connecting offshore wind power plant (WPP) to the onshore grid as black start unit to initiate the restoration process for an interconnected electrical system after a large area system blackout. The onshore converter station (CS) provides voltage in order to establish an electrical island within the integrated grid after offshore CS's and WPP`s black-start. Electric loads on the mainland can be resupplied and auxiliary power for the start-up process of a thermal power plant can be provided. Possible fundamental control structures for the VSC-HVDC CSs and for the WPP are proposed, with which a fast communication channel to the Wind Energy Generators (WEG) is not needed to ensure load balancing. The overall control strategy is shown as well as the appropriate control structures and the dynamic descriptions of the WPP, HVDC-CSs and the load. The proposed strategy is verified by simulating relevant study cases using PowerFactory.

EPE 2017 - LS5e: Wind
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 05: Renewable Energy Power Systems > EPE 2017 - LS5e: Wind
	[return to parent folder]

	Impact of Individual Pitch Control on Pitch Actuators in Megawatt Wind Turbines By Marcel MORISSE	[View] [Download]
Abstract: Individual pitch control is seen as a promising control technique for load reduction of the rotor blades in megawatt wind turbines.As the rotor blades are getting bigger and bigger, the asymmetric loads due to wind speed variations across the rotor area are increasing, too. Modern wind turbines include individual pitch actuators for every blade and the control effort is also reasonable. This is why a lot of research has been done on individual blade pitch control strategies and their impact on load reduction and further stress of the mechanical components, such as pitch bearings.The present work shows that individual pitch control is able to reduce mechanical fatigue loads,however, it affects the dynamic loads of the pitch motors and might lead to an increased overall stress of theirpower electronic converters.

	Improved Control Strategies for Three-Phase Four-Leg Virtual Synchronous Generator with Unbalanced Loads By Jianhua WANG	[View] [Download]
Abstract: This paper proposes improved multi-loop control strategies for three-phase four-leg virtual synchronous generator with unbalanced loads. Through the decoupling control of active and reactive power, inverter can simulate the characteristics of synchronous generator, including primary frequency modulation, primary voltage modulation, inertia and excitation characteristics. To improve the dynamic performance of micro-grid, the voltage and current dual-loop is cascaded after the power loop. In addition, to solve the problem of unbalanced voltage and frequency fluctuation in VSG caused by unbalanced load, a variable frequency adaptive resonance control strategy is proposed. The simulation and experiments validate the effectiveness of the proposed control strategy.

	Inverter Loss Analysis and Comparison for a 5 MW Wind Turbine System By Wataru KITAGAWA	[View] [Download]
Abstract: This article presents the losses of a 5 MW wind turbine generating system comprising of a permanent magnet assisted synchronous reluctance generator (PMaSynRG) system as well as an IGBT equipped forced-commutated inverter. In this article, the focus is on the classical 2-level converter and the NPC converter. Their inverter losses using three types of modules were calculated and compared.

	System Restoration using VSC-HVDC connected Offshore Wind Power Plant as Black-Start Unit By Holger BECKER	[View] [Download]
Abstract: This paper presents the possibility of using a point-to-point voltage source converter - high voltage direct current (VSC-HVDC) transmission system connecting offshore wind power plant (WPP) to the onshore grid as black start unit to initiate the restoration process for an interconnected electrical system after a large area system blackout. The onshore converter station (CS) provides voltage in order to establish an electrical island within the integrated grid after offshore CS's and WPP`s black-start. Electric loads on the mainland can be resupplied and auxiliary power for the start-up process of a thermal power plant can be provided. Possible fundamental control structures for the VSC-HVDC CSs and for the WPP are proposed, with which a fast communication channel to the Wind Energy Generators (WEG) is not needed to ensure load balancing. The overall control strategy is shown as well as the appropriate control structures and the dynamic descriptions of the WPP, HVDC-CSs and the load. The proposed strategy is verified by simulating relevant study cases using PowerFactory.