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Experimental research on the hydraulic power take-off system of a two-body floating-point wave energy absorber

Jianjun Peng, Yanjun Liu, Jibin Liu, Yu Li

This paper presents our recent study on the Dragon I which is a two-body floating-point absorber (FPA) wave energy conversion (WEC) device. The device operates in heave and generates energy from the relative motion between the two bodies. In order to solve the instability of power output, we use a hydraulic system which has the energy storage effect as power generation system. A mathematical model of the accumulator was established without considering the impact of the connecting pipeline; In addition, a series of land experiment was conducted based on the prototype machine, further verify the stabilizing effect of the accumulator to the periodic motion generated power; The resulted showed that the accumulator can achieve the function of "peak clipping fill valley", and the effects could significantly influence the power output.