| Energy is the foundation of economic development and material guarantee for improving the quality of human life.The transitional consumption of traditional fossil energy has brought about energy shortages and environmental pollution since the industrial revolution.The contradiction between energy and social development has become increasingly prominent.Ocean wave energy is a kind of renewable energy,which has the advantages of high energy density,clean and environment protection,and abundant reserves.The ocean wave energy has broad prospects for development and application.However,the harsh marine environment and severely uneven wave energy cycles make the development and commercial operation of wave energy face multiple challenges.At present,research on wave power generation focuses on wave energy converters(WEC)and control strategies.Based on the analysis of research status at home and abroad,this paper studies the structure and control strategies of point absorption wave power generation device.The specific research contents are as follows:1.Firstly,analyze the wave force applied to the buoy,and calculate the wave excitation force by F-K hypothesis,which lay a theoretical foundation for the analysis of the force and the motion of the WEC.2.A mathematical model in the time domain of a two-degree-of-freedom wave power generation device is established,five independent symbol variable are introduced to describe devices,and the influence of each symbol variable on the wave energy capture characteristics of the device is analyzed.3.Establishing the Euler-Lagrangian model of the two-degree-of-freedom wave power generation device and demonstrating the passivity of the system.Based on the energy shaping and damping injection methods,the passive control law of the system is designed.Further,the reference states of the maximum power capture of the device is derived under load control.Later,a simulation model is built in Matlab/Simulink to analyze the control effects of passive control law under regular and irregular wave forces.4.Based on the energy conversion characteristics of the WEC and the efficiency of thelinear generator,a subsection control strategy combing low-speed no-load energy storage with high-speed on-load power generation operation is proposed.A subsection controller is designed and its effectiveness is verified by simulation.Finally,the subsection control algorithm is written in TMS320F28335,and the effectiveness of the algorithm is verified experimentally based on the wave energy generator electric simulation device. |
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