Maximum Power Capture For Float Wave Power Generation System

With the development of economy all over the world, the energy demand ofhuman being is increasing year by year and keeps increasing, especially for thedeveloping countries. However, human’s over exploitation of the traditional energy,such as coal, oil and natural gas, results in the reduction of energy reserves andavailable exploitation with the price increases, which has triggered several times ofglobal energy crisis. In this condition, making strategic adjustment of energy structure,developing and utilizing renewable energy are becoming the common subject all overthe world.Wave power, as one of the green renewable energy, has the advantages of clean,large reserves, wide distribution and large density. After decades of research,development and accumulation, the existing wave power generation technology isdeveloping and utilizing towards large-scale, as well as, independent and stable ways.A large number of studies have been carried out on the design of wave powergeneration equipment, the regulation of the grid-connected power stability and theoptimization model of energy dispatch taken wind energy, PV and wave energy intoconsideration. Firstly, a novel float-type pulley wave power system is proposed basedon the analysis of the research status of wave power technology at home and abroad.Then, the operating principle is analyzed and the model is constructed and simulatedto verified the feasibility and effectiveness of the proposed system. Finally, the bestwave energy capture control of the new equipment is analyzed. Specific content canbe summarized as the following aspects.(1) The background and significance of the global wave energy development andutilization is introduced and the characteristics and distribution of the wave energy isstudied. Then the features and performance of the wave power generationtechnologies and the main wave power device are discussed and analyzed.(2) The slight wave theory and the incident wave velocity potential function areutilized to deduce water-point speed, acceleration, surface wave motion equations andMathematical expressions of pressure; Then the Froude-Krylov method is employedto analyze the wave pressure of the float suffered; Then, the advantages and disadvantages of different float shapes are evaluated in this paper.(3)A new pulley float-type wave power system is proposed based on researchingthe traditional structure of oscillating float-type wave power system; Then, deduce theequations for the motion of the float spring-damper system and its resonancecondition, which is the foundation of analyzing the float maximum wave energycapture control.(4) Float position self-adaptive estimator is established based on the motionequation of the float type wave power system. The maximum wave energy capturecontrol strategy for stable incident waves and the improved control strategy forrandom unstable waves are proposed. Finally, use MATLAB/Simulink to constructfloat-type wave power system and controller model; Simulation analysis of the bestwave energy capture control strategy of the system by changing the parameters of theincident wave; Compare the performance of the two control strategies in the aspectsof stable incident, slowly changing incident and dramatic changes in the incident.