| Energy is the material guarantee for the survival and development of human society and the foundation for national economic and social development.With the development of science,technology and social economy,people have more and more demand for energy.Wave energy has become one of the most promising marine energy sources because of its large reserves,wide distribution and various methods of capture.In this thesis,the oscillating buoy-type wave energy converter based on the floating breakwater is researched.The power take-off(PTO)system is designed by simulation and experimental research,and the algorithm of maximum power point tracking is designed to increase the generated power of the PTO.The main contents of this thesis are as follows:(1)By studying the theory of micro-amplitude waves and wave mechanics,analyzing the force of the oscillating float in the floating breakwater used,and perform hydrodynamic calculations with the AQWA software to obtain the additional mass of the float,the radiation damping coefficient,RAO and Furu De Krelov(FK)force and other hydrodynamic parameters lay the foundation for the next system modeling.(2)Based on the linear wave theory,the mathematical model of linear wave is established,which laid the foundation for the mathematical model of the linear PTO and hydraulic PTO.Then,The linearization analysis of the PTO system is carried out.The mathematical model of the linear PTO is established.The model of the linear system is established by Simulink software,and simulation research is performed.Based on this,a hydraulic PTO system is designed.Based on the design goals,the parameters of each key hydraulic component are determined,and the hydraulic system simulation is performed using AMESim software.(3)In order to optimize the extraction power of the PTO,based on the linear PTO and hydraulic PTO models,by changing the system damping,the system extraction power under different damping conditions is analyzed.And by changing the wave height and period,the optimal power of PTO system under different sea conditions and the change law of system damping are studied to lay the foundation for maximizing the extraction of wave energy.(4)In order to enable the PTO system to adapt to different sea conditions,the maximum power point tracking algorithm is designed based on the variable step climbing method.Based on the joint simulation of AMESim and Simulink,the PTO system is automatically optimized under different sea conditions,and the algorithm results are compared with The previous variable damping analysis results verify the feasibility of the algorithm.(5)In order to verify the system performance of hydraulic PTO,a small hydraulic PTO experimental platform is designed and constructed to perform hydraulic PTO system performance experiments,variable motor displacement and variable system load experiments,variable sea state experiments,and MPPT algorithm experiments in order to carry out the previous research.The simulation of the hydraulic PTO system is verified. |
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