Research On Direct-drived Wave Power Generation Device With Single-float Body

The development and utilization of fossil energy will inevitably cause serious environmental pollution and damage,and pose a serious threat to the global climate and environment on which we depend.Thus,the development of clean and renewable energy sources is receiving increasing attention.Wave energy has the highest energy density among renewable sources.Using wave energy to generate electricity can effectively solve the global energy shortage,improve the global energy structure and ecological environment,and promote the steady development of society and economy.The research of wave energy generation is mainly divided into three aspects: wave energy conversion device,power generation equipment and control technology.Based on the analysis and summary of the research status at home and abroad,this paper studies the mathematical model,structural parameter optimization and device control of the new direct-drive wave power generation device with single-float body.This paper analyzes the total velocity potential of a single-float body in waves based on the micro-amplitude wave theory,writes a dynamic model of the single-float body in the frequency domain,and analyzes the mathematical model of the direct-drive wave power generation device with single-float body affected by the radiating force of the seawater.The time-domain mathematical model of the new direct-drive wave power generation device with single-float body was obtained by converting the convolution term into the state-space equation.Aiming at the new direct-drive wave power generation device with single-float body,this paper proposes a design method of the floating body based on the actual sea conditions and the optimal average power algorithm.Firstly,based on the wave conditions,the natural frequency of the floating body is determined,and the reasonable range of the shape parameters of the floating body is calculated.Secondly,using the full factorial design method,the experimental floating body is designed and simulated in ANSYS-AQWA software.Finally,the influence of different parameters on the floating body is discussed based on the performance of the floating body capture power.The performance of the new single-float body and the traditional singlefloat body are compared.It is concluded that the performance of the new direct-drive wave power generation device with single-float body can be improved about 10 times.In this paper,an effective sliding mode control method is proposed for the new direct-drive wave power generation device with single-float body,and the sliding mode control rate is designed.In order to realize the control of the wave power generation device in the time domain,the author estimated the hydrodynamic parameters of the wave power generation device and converted the identified transfer function model into a state space model.The time domain model of the wave power generation device motion is completed.Finally,in the Matlab/Simulink simulation environment,the author uses regular waves and JONSWAP-based random waves to simulate the time-domain state-space model and designed sliding mode controller of a wave power generation device to verify the correctness of the device model and the effectiveness of sliding mode control.