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Title Wind Turbine optimised for VSC-DC transmission
Author Derdowski, Aleksander
Supervisor Xu, Zhao (Electric Power Engineering, Department of Electrical Engineering, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Rasmussen, Tonny Wederberg (Automation, Department of Electrical Engineering, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Nielsen, Arne Hejde (Electric Power Engineering, Department of Electrical Engineering, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Institution Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark
Thesis level Master's thesis
Year 2008
Abstract This thesis investigates the possibility of increasing power production connecting a Rotor Current Control (RCC) generator wind turbine to a Voltage Source Converter (VSC) HVDC transmission system. The generator is optimized in order to produce maximum power at every wind speed until nominal power is reached. The project contains an optimization algorithm to provide the reader with the optimum power production possible when being able to vary stator frequency, stator voltage and rotor resistance. The power production is presented and compared with AC connected wind turbines. The comparison of power production is performed in both steady state and in dynamic simulations. In steady state the VSC HVDC connected generator is compared with both a variable resistance and constant resistance AC connected wind turbine, in the dynamic simulation the comparison of the VSC HVDC generator is only done with the constant rotor resistance AC connected generator, as this is believed and demonstrated to be sufficient for showing the benefits of the new topology. The project proposes a control system for optimized power production using wind speed to generate reference signals for stator voltage and frequency. The new control system is submitted to a tripping of the receiving end converter (grid-side VSC) and the reaction of the new topology is shown for this type of faults. The project shows that there is a possibility of increasing the power production of wind turbines by allowing the generator to work with variable stator voltage and frequency and the operational range of the generator is presented. In Further research losses in the PWM converters have to be investigated to show if there is increased power submitted to the Grid. Other ideas for improvements on this field of study are also presented for future research.
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Admin Creation date: 2009-05-10    Update date: 2009-05-10    Source: dtu    ID: 242625    Original MXD