A Wave Energy Converter (WEC) based on a linear generator and a point-absorbing buoy has been developed at Uppsala University. Interconnecting an array of WECs in parallel requires a point of common coupling, such as a common DC-bus. The DC voltage level seen by the generator is directly linked to the electromagnetic damping of the generator. A lower DC-level results in a higher damping factor and is important for increased absorption of the wave power. The drawback is increased losses in generator windings and cable resistance. There will be an optimal DC-level for maximum power output. This is a function of not only generator and buoy characteristics, but the current sea state. Experimental results of the full-scale system have been carried out, and used as validation of a simulation model of the system. The model is then used to evaluate how the DC-level seen by the generator influence the power output. The results indicate that higher DC-levels should be used at higher sea states, and power output may vary by up to a factor five depending on which DC-level is chosen.
- Ocean, Offshore and Arctic Engineering Division
Evaluating Constant DC-Link Operation of Wave Energy Converter
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Ekström, R, Kurupath, V, Boström, C, Waters, R, Svensson, O, & Leijon, M. "Evaluating Constant DC-Link Operation of Wave Energy Converter." Proceedings of the ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. Volume 7: Ocean Space Utilization; Ocean Renewable Energy. Rio de Janeiro, Brazil. July 1–6, 2012. pp. 269-276. ASME. https://doi.org/10.1115/OMAE2012-83339
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