A master thesis from Aalborg University
Wavestar Generator
Author(s)
Term
4. term
Education
Publication year
2013
Submitted on
2013-05-30
Pages
65 pages
Abstract
A Wavestar system generates electrical energy from wave energy. Among the existing hydraulic or pressure based concepts presented in this report a mechanical transmission based system is described. It consists of a wave, float, gearbox, generator and converter and the goal is to design and test a controller of this system. A Permanent Magnet Synchronous Generator controlled through a Field Oriented Control strategy converts the wave power into electricity. The wave energy is converted into to mechanical power using a float technology developed in previous Wavestar projects. The system is modeled and a design of a controller is done for sinusoidal load torque and speed reference. This make the controller more complex compared with standard speed control. The simulation model of the system was created in Matlab/Simulink. A laboratory setup has been made to confirm the simulations, composed by an Induction Motor emulating the wave, connected to a PMSM, both controlled with a dSpace ControlDesk interface system. The experimental work was limited to a maximum speed of 500 [rpm] because of 2.2 kW IM output power. The average power extracted was 0.8 kW comparable with a 1.2 kW power from simulation results. The developed control is tested and the measured signals are torque, speed and power, with a working proposed control strategy. The conclusions are drawn based on system analysis and proceeded tests.
Keywords
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