Power Control Analysis And Experiment Of Wave Energy Conversion Device Based On Improved Hill-Climbing Algorithm

The hydraulic wave energy converter(WEC)has always been the focus of research at home and abroad because of its ability to adapt to low-frequency high-force waves and to generate stable power output.Based on the small hydraulic wave energy conversion device platform that has been built in the laboratory,this paper mainly studies the control strategy of power acquisition under random wave sea conditions and the experimental verification under laboratory platform conditions.The purpose is to make hydraulic wave energy conversion device produces more energy.The main contents of this thesis are as follows:(1)By reading relevant literatures at home and abroad,introduce the first-stage conversion device is a single oscillating float type hydraulic wave energy conversion device.,classify the different control strategies applied in the wave energy conversion device,and discuss its principle and application.(2)First,the hydraulic WEC energy conversion process is introduced,and the overall structure of the device is described;then the wave theory is analyzed,the hydrodynamic analysis under the hydraulic WEC time domain simulation is carried out,and the wave energy conversion device is carried out in Simulink,linearized modeling and linearized simulation under random wave input,the simulation results show that there is an optimal damping point for hydraulic WEC,which makes the power generation of the device the highest,this leads to the optimal damping theory.(3)Describe the hydraulic PTO system of the hydraulic WEC,and then carry out AMESim simulation of the hydraulic PTO system under random wave sea conditions.In order to make the generator output stable power,a control strategy based on hydraulic motor speed regulation is designed for the power generation stage.This method can obtain the highest power because the device has been running under the optimal damping condition,but in the real ocean In the environment,this method is difficult to realize.The hydraulic motor speed adjustment can make the generator end obtain a relatively stable power output,and the average output power is compared with the automatic optimization algorithm proposed later to verify the accuracy of the designed self-optimizing control algorithm.(4)Two control strategies are designed to improve the power generation in the hydraulic WEC conversion stage.They are the design of the hill-climbing algorithm based on the MPPT control algorithm and the improved fuzzy PID-hill-climbing algorithm joint algorithm.These two control algorithms are self-optimizing algorithms and practical.The simulation results show that the hydraulic WEC can obtain more power generation by using the improved joint control algorithm than using the MPPT algorithm alone.(5)In order to verify the feasibility and accuracy of the previous control algorithm,the optimal damping theory proposed above and two control algorithms based on the hill-climbing algorithm were designed through the existing small onshore hydraulic wave energy converter experimental platform in the laboratory.Finally,the experimental results are analyzed and summarized.