| With the development of the times,people are paying more and more attention to the environment,and the concept of green and sustainable development is deeply rooted in the hearts of the people.The development of new energy sources has attracted more and more people’s attention.With the increasing development of land resources and moving toward the ocean,the use of ocean energy has gradually become an inevitable trend in the development and utilization of new energy.Our country’s offshore wind and wave energy reserves are considerable,but they have not yet been effectively utilized.Offshore power generation can ease China’s increasingly urgent electricity use on the road.Therefore,this article intends to propose a new type of wind-wave combined power generation equipment to provide a reference for the deployment of offshore wind-wave power plants.Wind-wave combined power generation equipment has its natural advantages,and wave energy is also abundant in places with abundant wind energy;and the wind-wave combined power generation equipment shares a set of power transmission system with the wave energy device,which can greatly reduce the cost of power transportation.Wind-wave combined power generation equipment can use ocean space more effectively than a single power generation equipment,greatly improving the annual power generation efficiency of the power generation array and the energy utilization rate of the sea area.This paper mainly studies the impact of wave loads on wind-wave combined power generation equipment,and conducts preliminary conceptual design and optimization of wind-wave combined power generation equipment.The main research contents are as follows:(1)The wave numerical model is verified by measured data,and the wave evolution analysis is carried out according to the dynamic spectrum balance equation.The measured wave data during the typhoon "Doksuri" and the winter cold wave and strong wind are compared with the wave data obtained from the numerical simulation to verify the feasibility of calculating the wave evolution numerical simulation through the dynamic spectrum balance equation.The wave height and period are simulated and calculated,and the long-term wave height and period are statistically analyzed to provide a preliminary basis for the selection of the wind turbine foundation and the form and size of the wave energy device.(2)A conceptual design of wind turbine foundation and wave power generation device suitable for corresponding water depth is proposed.According to the ocean wave parameters,suitable wind turbines and wave energy generators are selected,and the structure size of the oscillating float-type float is optimized from the perspective of heave response based on the potential flow theory.For the integrated method of wind-wave combined power generation equipment,the wave force received by the wind turbine foundation and the heave response of the wave energy float are used as the criterion.The hydrodynamic performance research and optimization design are carried out in terms of the separation distance between the wind turbine foundation and the wave energy float and the stiffness of the PTO(Power-take-off)system.(3)The strength check of the fixed wind-wave combined power generation equipment completed in the preliminary design.Under the design conditions,the maximum effective stress and maximum displacement of the wind-wave combined power generation equipment were simulated and calculated to ensure that the structure can meet the requirements of yield strength and stiffness.Use the frequency domain spectrum analysis method to analyze the fatigue damage of the structure.After determining the hot spot,select the S-N curve recommended by DNV.Under the condition of 50 years as the design life,the structure can still resist the fatigue erosion of the wave load and meet the fatigue strength requirements. |
