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WECS 2009: The Dialogue Session Papers and Posters
You are here: EPE Documents > 03 - EPE Seminar Papers > 003 - EPE Wind Energy Chapter Seminar (2009) > WECS 2009: The Dialogue Session Papers and Posters
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	Control of a Doubly Fed Induction Generator System to Reduce Dynamical Power Train Loads of Wind Turbines - Paper   By C. Mehler, T. Völker, B. Orlik	[View]   [Download]
Abstract: This paper presents a new control strategy for wind turbines which promises a reduction of the dynamical power train loads and high power output as long as fixed (system-dependent) maximum loads are not exceeded. The control strategy is based on a torque control (in this case of doubly fed induction generator system) with an additional torsional moment control and can be transferred to other torque controlled machine types.
	Control of a Doubly Fed Induction Generator System to Reduce Dynamical Power Train Loads of Wind Turbines - Poster   By C. Mehler, T. Völker, B. Orlik	[View]   [Download]
Abstract: Control of a Doubly Fed Induction Generator System to Reduce Dynamical Power Train loads of Wind Turbines, the poster
	Control of Active Front-End Inverter of Wind Energy Plants during Assymetrical Grid Faults - Paper   By T. Völker, C. Mehler, B. Orlik	[View]   [Download]
Abstract: Back-to-back converters are an interesting popular solution for electric drive controls. Higher dynamic performance as well as improved efficiency by recovery of breaking energy are popular features. Especially for renewable energy sources like wind energy the active front-end inverter is needed to feed the energy into the grid. The control of the active front-end must regulate the DC-link voltage. If there are asymmetrical three phase voltages in the grid the conventional DC-control produces dissatisfactory results. In this paper a new control strategy of the operation of back-to-backl converters is presented. A new coordinate transformation is used to increase performance of the control with asymmetrical grid voltages. The new control scheme is tested in sumulations and measurements.
	Control of Active Front-End Inverter of Wind Energy Plants during Assymetrical Grid Faults - Poster 1   By T. Völker, C. Mehler, B. Orlik	[View]   [Download]
Abstract: Control of Active Front-End Inverter of Wind Energy Plants during Assymetrical Grid Faults - Poster 1
	Control of Active Front-End Inverter of Wind Energy Plants during Assymetrical Grid Faults - Poster 2   By T. Völker, C. Mehler, B. Orlik	[View]   [Download]
Abstract: Control of Active Front-End Inverter of Wind Energy Plants during Assymetrical Grid Faults - Poster 2
	Stochastic Modelling of Wind Power Series based on Markov Chains - Poster   By P. Souto Perez, J. Driesen, R. Belmans	[View]   [Download]
Abstract: Stochastic Modelling of Wind Power Series based on Markov Chains, the poster
	Simulation Package for Simulating Wind Power Devices - Poster   By J. Luukko, V. Haverinen, V. Ruuskanen, T. Lindh, R. Tiainen, M. Pääkkönen, R. Pöllänen, O. Pyrhönen	[View]   [Download]
Abstract: Simulation Package for Simulating Wind Power Devices, the poster
	Medium Voltage Multilevel Converters for a Multi-MW Wind Turbine Grid Connection - Paper   By Osman S. Senturk, Lars Helle, Stig Munk-Nielsen, Pedro Rodriguez, Remus Teodorescu	[View]   [Download]
Abstract: Recent advances in the wind power technology have increased wind turbine power ratings to multi-MWs. This increase and recentlty introduced strict grid codes are spurring the utilization of full-scale medium voltage (MV) grid-side power electronics converters in wind turbines. In this study, for the grid connection of a hypothetical 6MW-3kV wind turbine, three-level (3L) configurations of NPC, FC, and HB VSCs are simulated for PF=0.9-1 and fc=650-1050 Hz. The simulation results show their performance with respect to total harmonic distortion of current, switch utilization, switch losses, and loss distribution. Finally, these VSCs are compared with respect to the two most important criteria (power density and reliability) for the 6 MW wind turbine connected to a MV (>3kV) grid via a transformer.
	Medium Voltage Multilevel Converters for a Multi-MW Wind Turbine Grid Connection - Poster   By Osman S. Senturk, Lars Helle, Stig Munk-Nielsen, Pedro Rodriguez, Remus Teodorescu	[View]   [Download]
Abstract: Medium Voltage Multilevel Converters for a Multi-MW Wind Turbine Grid Connection, the poster
	Simulation of Dedicated HVDC for Wind Power Transmission - Paper   By S.K. Chaudhary, R. Teodorescu, P.C. Kjaer, P.W. Christensen, P. Rodriguez	[View]   [Download]
Abstract: Offshore wind power is an emerging source of huge renewable energy source. Several offshore wind power plants have been conceived in the seas around Europe. VSC-HVDC transmission is another recent technology suitable for connecting the offshore wind power plants to the mainland power grid network for subsequent transmission and distribution to load centers. Simulation of VSC-HVDC for Wind Power Transmission enables a detailed study of the interaction between these two technologies so as to harness wind power potential while economizing the system costs. A simulation model is described here.
	Simulation of Dedicated HVDC for Wind Power Transmission - Poster   By S.K. Chaudhary, R. Teodorescu, P.C. Kjaer, P.W. Christensen, P. Rodriguez	[View]   [Download]
Abstract: Simulation of Dedicated HVDC for Wind Power Transmission, the poster
	Comparative Analysis of Standard Speed Control and State Space Control of Permanent Magnet Synchronous Generator in Wind Power Plants - Paper   By Ralf Lohde, Friedrich W. Fuchs	[View]   [Download]
Abstract: A comparison of field oriented control and and state space control for power electronic generator systems of wind turbines is presented. The aim of this work is the optimization of the power gain and the reduction of dynamic stress of the drive train and the reduction of flicker in both caused by fluctuating wind speed. The work is carried out by means of simulation based on a high order model and the use of measured wind speed data with different average wind speeds and fluctuations. The controller parameters of the two controller methods were optimized by means of three cost functions. The behavior of the wind turbine system with the two optimized controller methods is compared with each other.
	Comparative Analysis of Standard Speed Control and State Space Control of Permanent Magnet Synchronous Generator in Wind Power Plants - Poster   By Ralf Lohde, Friedrich W. Fuchs	[View]   [Download]
Abstract: Comparative Analysis of Standard Speed Control and State Space Control of Permanent Magnet Synchronous Generator in Wind Power Plants, the poster
	Medium Voltage Line Side Inverter for Windmill Applications - Poster   By Dejan Schreiber, Ingo Staudt, Peter Beckedahl, Braig Allain	[View]   [Download]
Abstract: Medium Voltage Line Side Inverter for Windmill Applications, the poster
	Wind Energy Conversion System Based on a Doubly Fed Induction Generator: Study and Simulation - Paper   By M.Kesraoui, S.Toutaoui, R.Azira	[View]   [Download]
Abstract: This article proposes the study and the simulation of a variable speed wind energy conversion system based on a doubly fed induction generator (DFIG). A wind speed variation sample is applied to the model of the wind turbine. The traditional equations describing the mechanical operation of a classical horizontal wind turbine are used. The resulting torque reference is then applied to the DFIG which is controlled in order to obtain a maximum output power at each speed. The power flow between the stator of the DFIG and the grid is controlled by using the decoupled active and reactive power vector control method. The powerful MATLAB/SIMULINK software has been used for the simulation of the whole system.
	Upgrading Wind Farm Connections with Tripole HVDC - Poster   By I. Martinez De Alegria, J.L. Martin, H. Camblong, J. Andreu, I. Kortabarria	[View]   [Download]
Abstract: Upgrading Wind Farm Connections with Tripole HVDC, the poster
	Practical Implementation of the Brushless Doubly Fed Induction Machine in a Wind Turbine - Poster   By Richard McMahon, Ehsan Abdi, Tom Logan, Shiyi Shao, Sven Weier, Joe Warrington, Paul Malliband, Mmamolatelo Mathekga, You-Chiuan Hsu, Peter Tavner	[View]   [Download]
Abstract: Practical Implementation of the Brushless Doubly Fed Induction Machine in a Wind Turbine, the poster
	Control of Doubly-fed Induction Generators during Asymmetrical Grid Faults - Paper   By Marlies Richter, Itziar Martinez, Daniel Navarro, Uwe Rädel	[View]   [Download]
Abstract: In the presented study a scheme for the control of DFIGs in wind turbines during asymmetrical voltage dips is suggested. The back-to-back converter is controlled by an advanced control scheme (PN-control) based on field oriented control (FOC). The suggested control scheme is tested by simulations with Mathlab/Simulink.
	Control of Doubly-fed Induction Generators during Asymmetrical Grid Faults - Poster   By Marlies Richter, Itziar Martinez, Daniel Navarro, Uwe Rädel	[View]   [Download]
Abstract: Control of Doubly-fed Induction Generators during Asymmetrical Grid Faults, the poster
	Comparison of the LVRT for Different Control Modes of Reactive Power and Voltage - Poster   By Isabelle Boulanger	[View]   [Download]
Abstract: Comparison of the LVRT for Different Control Modes of Reactive Power and Voltage, the poster
	Exact Predictive Direct Power Control of Three-Level NPC Converters for Wind Power Applications - Paper   By E. Oyarbide, A. Martinez-Iturbe, S. Aurtenechea, M.A. Rodriguez-Vidal, E. Laloya	[View]   [Download]
Abstract: This contribution deals with an improvement of the Predictive Direct Power Control (P-DPC). The standard D-PDC strategy a) establishes a constant switching period, b) based on the nearest three-vector (NTV) strategy, the method selects three voltage-vectors to be concatenated during the switching period, building a symmetrical 3+3 switching patern c) by taking into account the time-derivates of the active and reactive powers, the vector-application times that minimize the final tracking error are computed. The selection of three vectors based on the NTV strategy minimizes the current ripple and the THD but does not offer the entire available transient dynamic. When hard transients are required, incoherent application times are obtained, i.e., control saturation occurs. This paper presents a method in order to avoid this saturation. When saturation is detected, the algorithm changes to a three-voltage vectors sequence built by two far and strongly active voltage vectors followed by a near and poorly active voltage-vector. Though the solution (application times) of the standard P-DPC problem is obtained by the minimization of a weight function, this contribution shows that it is possible to compute the exact application times for both steady and transient vector sequences. In comparison to other state-of-the-art control methods under constant switching frequency, the exact D-PDC strategy offers the faster transient behavior and similar steady-state performance. Simulated results match with the expected behavior and reinforce the choice of the P-DPC as an attractive candidate for the control of MV grid connected converters.
	Exact Predictive Direct Power Control of Three-Level NPC Converters for Wind Power Applications - Poster   By E. Oyarbide, A. Martinez-Iturbe, S. Aurtenechea, M.A. Rodriguez-Vidal, E. Laloya	[View]   [Download]
Abstract: Exact Predictive Direct Power Control of Three-Level NPC Converters for Wind Power Applications, the poster
	Measurement and Analysis of PCC Voltage Variation in a Wind-Diesel Hybrid System - A Case Study in Sapsi Island - Paper   By Ji-Hoon Im, Seung-Ho Song, Eel-Hwan Kim	[View]   [Download]
Abstract: A 10kW wind turbine is installed and its output is connected to an isolated power grid, which is supplied by a local power plant with diesel generators in the Sapsi-island in Korea. As part of an experimental program to evaluate wind turbine generator performance on the isolated diesel power system, the measured voltage data and simulation results are compared and analyzed to mitigate the voltage variation problem which was one of the most important issues for the application of high penetration wind farm in an isolated grid. A simplified simulation model using PSCAD/EMTDC and a T-equivalent circuit model of the local power system is developed and evaluated using the field measurement data of the voltage variation during the wind power generation. The proposed T-equivalent circuit model is very simple and helpful to predict the voltage variation at the PCC (point of common coupling) according to the location of the WECS and the load change when the rating of WECS is decided. The most important parameters are the power rating of the WECS and the line-side effective impedance which is decided by the location of WECS installation in the network.
	Measurement and Analysis of PCC Voltage Variation in a Wind-Diesel Hybrid System - A Case Study in Sapsi Island - Poster   By Ji-Hoon Im, Seung-Ho Song, Eel-Hwan Kim	[View]   [Download]
Abstract: Measurement and Analysis of PCC Voltage Variation in a Wind-Diesel Hybrid System - A Case Study in Sapsi Island, the poster
	The MixedPole Machine, a Hybrid Permanent Magnet Machine for Wind Generators, Ship Propulsion and Traction - Poster   By Vilmos Török	[View]   [Download]
Abstract: The MixedPole Machine, a Hybrid Permanent Magnet Machine for Wind Generators, Ship Propulsion and Traction, the poster