In order to achieve a rapid response to waves and the efficient collection and utilization of wave energy, starting from the hydraulic power take-off（PTO）system of the wave energy converters, the scheme design of the multi-stage unit PTO system was carried out, and the design parameters of each component were determined. To verify the performance of the multi-stage unit PTO system, simulations were conducted under three sea conditions for a single-stage PTO system, a two-stage unit PTO system （50 kW+50 kW）, and a three-stage unit PTO system（20 kW+30 kW+50 kW）, all with a total installed power of 100 kW. The system pressure, total power generation, and the power of each generator from the simulation results were compared and analyzed. The results show that under small wave conditions, the three-stage unit generates the least amount of electricity, while the two-stage unit generates the most electricity; under large wave conditions, the three-stage unit generates the most electricity, and the two-stage unit generates the least. In summary, under the same wave conditions, the multi-stage unit energy conversion system has a better response time and generates more electricity than the single-stage unit; and the more stages a unit has, the higher the system's adaptability to large waves will be.
Key words
wave energy /
hydraulics /
power takeoffs（PTO） /
multistage unit
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