Wave Power Facility Successful in Sweden
Sunday, December 14th, 2008
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A wave energy plant located in the sea outside Lysekil, Sweden has been quite successful. In his dissertation for Uppsala University, Rafael Waters* is presenting findings from the experimental facility, in which he has played a leading role in designing and constructing.
For nearly three years, a wave power plant has stood on the bottom of the ocean a couple of kilometers off the west coast of Sweden, near Lysekil. Rafael Waters, from the Uppsala University Division of Electricity, designed and built the facility as part of his doctoral project. The station is uniquely durable and maintenance-free thanks to its simple mechanical construction, which was engineered at the Division.
“Instead of trying to adapt conventional energy technology to the special challenges of wave energy, we developed a technology that is adapted to the ocean from the start,” says Rafael Waters.
The generator in the wave power facility in Lysekil is very special. It is a so-called linear generator that generates electricity apace with the slow movements of the waves. An ordinary generator transforms rotation energy to electricity, and it needs to turn at about 1500 rpm to be efficient. It is then necessary somehow to convert the slow wave movement to a rapid rotating movement.
“This means that a wave energy station with an ordinary generator needs energy transmission systems such as gearboxes or hydraulic systems and other complicated details that wear out and require much more maintenance than a linear generator,” says Rafael Waters. “Our generator has functioned without any trouble every time we started it up over the years, even though it has received no maintenance and has sometimes stood still for months.”
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