Research On Energy Capture Characteristics Of Multi Buoys Array Based On Mooring Platform

Renewable energy development is an important direction of energy development in the world today.In renewable energy,wave energy is widely distributed,has high energy density,and is easy to develop on a large scale.The South China Sea is an area rich in wave energy resources in my country,and a large number of strategically significant islands are distributed.A single wave energy power generation device has a high processing cost,the safety and reliability of a single device cannot be guaranteed.As a kind of integrated power supply platform,which can carry a variety of marine instruments,it can not only solve the power supply problem of remote islands,but also realize real-time remote monitoring of marine data in related sea areas.Combined with the existing offshore mooring platforms,equipped with multiple wave energy harvesting units,the reliability of the wave energy power generation device is improved,and the operation and maintenance cost of a single wave energy power generation device is reduced.Only then can we truly achieve "obtaining energy on the spot,using sea energy at sea".This thesis chooses to combine the wave power generation device with the mooring platform,and arrange the energy harvesting buoys on the mooring platform in an array to achieve the purpose of supplying power to the mooring platform and remote islands.Through the simulation analysis of the buoys,the feasibility of the development and utilization of wave energy in this way in the South China Sea is discussed.This thesis includes six chapters in total.The first chapter introduces the background and significance of the research.This chapter introduces the current research status of array wave energy power generation devices at home and abroad through wave energy conversion devices,array hydrodynamic research and array power generation effects.The second chapter conducts theoretical analysis of wave motion,and provides a theoretical basis for the construction of three-dimensional numerical wave flume by introducing potential wave theory,linear wave theory and nonlinear wave theory.The third chapter is the construction of three-dimensional numerical wave flume.Establish a three-dimensional numerical wave flume based on the N-S equation.According to the theoretical analysis in Chapter 2,the appropriate wave model is selected,and the wave simulation verification is carried out.Simulate the heave buoy and pitch buoy in the numerical wave flume,and according to the flow field analysis of the simulation results,the optimal spacing of the array of floats is obtained.The fourth chapter carries on the simulation analysis of the array buoys.Through the use of ANSYS-AQWA software,the frequency domain and time domain analysis of a single row of multiple floats are carried out.Analyze the relationship between response amplitude operator,radiation damping,F-K force and additional mass with wave frequency,as well as the relationship between the energy capture effect of the buoys and the placement position of the buoys.Finally,multiple buoys are arranged in arrays of different shapes,and the optimal buoy arrangement method is selected by comparing the energy capture effects of the array buoys of different shapes.The fifth chapter designs the hydraulic system for the array-buoy wave energy generating device based on the mooring floating platform.In order to facilitate the installation of the power generation device on the existing mooring platforms,a hydraulic cylinder that is convenient to carry the buoys is designed,which is beneficial to the conversion of hydraulic PTO,through the design of the hydraulic system to improve the stability of wave energy conversion.The last chapter summarizes the full thesis,gives the main innovations of this thesis and proposes prospects.