Design And Performance Analysis Of Mechanical Rectification Wave Energy Converter

With the development of our country’s social economy,the demand for energy is also increasing.However,traditional fossil energy is not renewable,and large-scale use will cause environmental pollution.Therefore,the development of clean and renewable energy has become a trend in today’s society.As a clean and renewable energy,wave energy has abundant reserves,and its reasonable development and utilization can effectively alleviate the problems of energy shortage and environmental pollution.Commonly proposed ocean wave energy converters need to use intermediate hydraulic and pneumatic systems to convert wave energy into electrical energy.Aiming at the disadvantages of complicated structure and difficult maintenance of intermediate converter such as hydraulic or pneumatic.This paper proposes a mechanical rectification wave energy converter,the main contents are as follows:(1)The structure of the device was designed,it mainly includes three parts: Power take-off(PTO),float and generator.The reciprocating linear motion of the float is directly converted into the rotary motion through the ball screw and transmitted to the generator.The magnetic coupling force transmission system is adopted to ensure the sealing of the device.Using mechanical rectification mechanism to ensure the service life of the generator Based on the micro-wave theory,the device was analyzed in the frequency domain,and the hydrodynamic parameters such as the wave excitation force,additional mass,and radiation damping of the float were obtained through the AQWA software,which laid the foundation for the modeling and analysis of the power generation system.(2)Based on the linear PTO theory,the dynamic analysis of the PTO system is carried out.By building a simulation model of the PTO system and generator,the motion response of the float and the input and output power under given sea conditions are obtained.According to the PTO force of the system,the structural parameter design of the magnetic coupling force transmission system is completed.(3)Based on the simulation model of the device,the influence of damping on the performance of the PTO system is analyzed,obtain the input and output power under different load resistance,and verify the optimal damping theory.And the influence of wave period on power acquisition is obtained by changing the wave conditions.On this basis,by modeling irregular waves,the relationship between power and load resistance under irregular wave conditions is obtained.(4)In order to increase the power generation efficiency and enable the wave energy converter to obtain the optimal power under different sea conditions,the maximum power point tracking algorithm is designed based on the admittance differentiation method.Through the simulation,the automatic optimization results of the PTO system under different wave conditions are obtained.And the algorithm results were compared with the previous optimal power results obtained by multiple simulations,which verified the feasibility of the algorithm.