Optimization Of Point Absorber Wave Energy Converter And The Control Of Absorbing Maximum Wave Energy

With the rapid development of human society,the demand for energy is increasing rapidly.At the meantime,the process of generating oil natural gas and coal and other fossil fuels which were used heavily is quite slowly.The generating speed of fossil energy is much slow than the speed human consume fossil energy.As a result,fossil energy on the earth is rapidly decreasing,and this conflict has triggered a global energy crisis.On the other hand,the rough use of fossil energy leads to environment problems such as greenhouse effect and acid rain,which are threat to the development of human.Therefore,for the sustainable development of human beings,it is self-evident that adjusting energy structure and searching for renewable and clean energy are very important.In recent years,renewable clean energy,such as wind and solar energy,has attracted the attention of people,and the related applications are also being promoted.While wave energy,which is another form of renewable clean energy,has not yet been extended as widely as wind and solar energy.Wave energy is a kind of potential energy.It has the advantages of no pollution and widely distributed.After a century of development,now the use of wave energy aims at the direction of large-scale commercial development,the current research on the wave energy generating focused on the optimization design of wave energy absorber and the power take off system.Based on the analysis of the research hotspots and research status of wave power generation at home and abroad,a self-reference oscillating buoy wave energy converter is proposed in this paper.And fuzzy control is applied to control the wave energy converter in laboratory simulation.The specific research contents are as follows:1.Firstly,use related knowledge of hydrodynamics to analyze the force applied on the buoy and introduce three kinds of wave force calculation method commonly used.Focuses on the application Froude Krylov assumption and use it to calculate the force applied on buoys of different shapes.And design a buoy according to the power level of the generator.2.Propose the mathematical model of the fixed-referenced and the self-reference oscillating buoy wave energy converter.And their motion characteristics are analyzed in detail.Their power output curves are compared.The superiority of the self-reference device is analyzed,and the optimal damping coefficient corresponding to the maximum power output of the device is mathematically derived.3.Model of the linear generator of direct drive power generation system is proposed,the BUCK-BOOST circuit used in the power treatment and processing is analyzed and the wave energy converter model on Simulink is built.4.The principle of fuzzy controller is analyzed,and the fuzzy control method is applied to the wave energy converter,and the fuzzy controller is developed on Simulink,and its correctness is verified.5.Fuzzy control algorithm is written on the sbRIO-9606& NI 9683 platform.Experiments are carried out on the laboratory electromechanical simulation platform to verify the effectiveness of the control algorithm.