Evaluating Constant DC-Link Operation of Wave Energy Converter
2014 (English)In: Journal of Dynamic Systems Measurement, and Control, ISSN 0022-0434, Vol. 136, no 1, 014501- p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2014. Vol. 136, no 1, 014501- p.
Engineering and Technology
Research subject Engineering Science with specialization in Science of Electricity
IdentifiersURN: urn:nbn:se:uu:diva-213447DOI: 10.1115/1.4024789ISI: 000327497500019OAI: oai:DiVA.org:uu-213447DiVA: diva2:683541