As one of the methods to increase in efficiency of wave energy absorption by the point absorber wave power generator, the phase control was proposed by K.Budal et al.. It is the method to make the float of point absorber oscillate as same as under the condition of resonance in any sea condition. Authors applied this method to the oscillating water column (OWC) type device and investigated the optimum control method, the increase in efficiency and the effect on an air turbine generator . The principal results of these studies are reported in this paper.
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