| The development and utilization of energy in the 21st century has posed new challenges to all countries in the world.Renewable marine energy in the form of waves and temperature difference has become the main battlefield of energy for all countries in the world.China is a negative land and sea,land and sea,a large country with rich marine resources.The research and development of wave energy power generation system with higher efficiency and better stability can help China occupy a leading position in marine energy development.This paper focuses on the problems of poor power generation stability,low energy capture efficiency and large energy conversion loss in the field of wave energy power generation,optimizes the design of oscillating float wave energy generation device,proposes the optimized design of energy capture mechanism based on potential flow theory,the integrated design of hydraulic conversion cylinder,and the optimized design of electrical energy input control system,and improves the fuzzy PID control strategy through genetic algorithm.The optimal power tracking control of the wave power generation device is realized by the improved fuzzy PID control strategy with genetic algorithm,and the development of the wave power generation device prototype is completed based on the design scheme.Firstly,with regard to the power generation characteristics of wave energy power generation system,the development history of different types of wave energy power generation devices at home and abroad and the current research status of wave energy power generation device control strategies at home and abroad are synthesized,and the urgent problems of existing wave energy power generation devices are pointed out,and the key research contents of this thesis are proposed to optimize the structure of power generation device,optimize the output power efficiency and stability of power generation device.Secondly,based on the hydrodynamic theory analysis of simplified floating structures,a dolphin-type float mathematical model based on the load frequency domain analysis boundary element method is proposed to build a power relationship model between wave input parameters and power generation output parameters.Again,to address the shortcomings of the existing oscillating float type wave energy generation system,a dolphin type float is optimized to improve the energy capture efficiency of the energy capture mechanism;an innovative integrated hydraulic conversion cylinder is proposed to effectively reduce the pipeline throttling loss and optimize the oil absorption characteristics;the electrical energy input control system is optimized and designed with the functions of input electrical energy control,voltage stabilization and inversion,pulse width modulation unloading,etc.From then on,in order to solve the problems of poor stability and low efficiency of hydraulic transmission system power generation,the hydraulic PTO optimal power tracking control strategy is studied,the fuzzy PID control algorithm is improved by genetic algorithm,the system model is established,and simulation comparison tests are carried out to effectively improve the efficiency and stability of the hydraulic transmission system.Finally,based on the above research,the development of the integrated oscillating float wave energy generation device prototype was completed,and the float energy capture system,hydraulic transmission system and electrical control system of the prototype were designed in turn and simulated power generation tests were conducted on land to analyze the influence characteristics of the main parameters of the system on the electrical energy output,and to analyze the effect of the integrated hydraulic conversion cylinder on the energy conversion efficiency of the hydraulic transmission system.The final construction of the offshore power generation test vessel and the proposed offshore power generation test will be of great significance to accelerate the commercial application of wave energy generation. |
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