Date of Award
Doctor of Philosophy
Electrical and Computer Engineering
The permanent magnet synchronous generator (PMSG) wind turbine control for damping power system inter-area oscillations is a topic of much interest. However, the PMSG wind turbine controls in the generator and grid sides such as a PMSG speed control or dc voltage control do not have a sufficient power modulate to damp the inter-area oscillations which are caused by the wind speed or load change. This research develops a procedure for design an auxiliary feedback control to damp the inter-area oscillations. This dissertation investigates the use of the permanent magnet wind generator as a means for damping dynamic inter-area oscillations in multi-area power systems. The feedback loops control are investigated to damp the inter-area oscillations. Two methods of controls are discussed to modulate the power based on damping torque control and H-infinity design methodology. The controller uses as feedback the frequency deviation of the local power system area and applies effective control on the wind generator rotor speed, blade pitch angle and dc link voltage to provide sufficient power modulation at the output of the generator to damp inter-area oscillations. The dissertation also investigates the potential use of the energy stored in the dc link capacitance as an auxiliary means to increase the power modulation capability of the generator. The proposed methods of control are applied to the Libyan power system and IEEE 9 bus system. The MATLAB is used to design the controller and validate the results. The results demonstrate the effectiveness of the PMSG wind turbine to damp the inter-are oscillations.
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