Research On Optimization Control Method Of Efficiency Of Seawater Pressure Energy Conversion Device Of Marine Animal Telemetry Tags

Changes in the state of the ocean not only affect global climate change,but also ocean resources.To grasp the state of the ocean and its changes,and study the mechanism of its climate and resource effects,real-time observation of the state of the ocean is necessary.The huge scale,opacity and dynamic changes of the marine environment hinder its exploration and understanding.Methods of traditional ocean observation are costly and the observation range is limited by the marine environment.The technology of telemetry tag using marine animals as a carrier provides an important way.The technology of marine animal telemetry tag uses dozens of marine animals as a carrier to carry telemetry tags to collect various environmental data and biological behavior data during their movement.The data is transmitted in real-time or quasi-real-time through satellites or hydroacoustic networks.It is possible to collect ocean data in a frequency and breadth that cannot be achieved by traditional observation methods.As the demand for animal telemetry tag data increases,there are more and more types of sensors that tags need to integrate.In addition,to improve the spatial and temporal resolution of data,it is necessary to increase the frequency of data collection and transmission.These will inevitably lead to a sharp increase in the energy demand of the tag,and improving the power supply capacity of the tag has become a major challenge for the development of the current tag technology.This paper proposes an optimized control method for improving the conversion efficiency of seawater pressure energy of marine animal telemetry tags.This method adjusts the input impedance of the energy storage system in real time according to the collected voltage data to match the impedance of the pressure energy core conversion structure,improving the efficiency of the system in converting seawater pressure energy into electrical energy.The main content of the paper is as follows:First,the purpose and significance of the research,the current research status of the utilization of seawater pressure energy,and the research status of the optimization control method of ocean energy conversion efficiency are introduced.Second,a pressure-energy conversion efficiency optimization control structure is proposed,and its theoretical model is established,and the theoretical expressions of input impedance and energy storage capacitor voltage are obtained.An open-loop simulation model of the control structure is established,and the input impedance and energy storage capacitor voltage curve are obtained through simulation analysis.The theoretical and simulation results of input impedance and energy storage capacitor voltage are compared,and the theoretical model and simulation model of the system are preliminarily verified.Based on the simulation model,the influence of seawater pressure and the initial voltage of the energy storage capacitor on the energy conversion efficiency of the system when the duty cycle is fixed is studied.Third,the hardware circuit is designed,the test platform is built,the test data is collected and analyzed,the simulation results and the test results are compared,and the simulation model is further verified.Finally,an impedance matching model for pressure energy optimization control structure is established.Based on the input impedance expression,the relationships between input impedance and duty cycle,output voltage and input voltage are obtained.By collecting the input voltage and output voltage,real-time control of the duty cycle of the MOS tube makes the input impedance of the energy storage system match the impedance of the pressure energy core conversion structure,and improves the pressure energy conversion efficiency of the system.The energy conversion efficiency of the system with a fixed duty cycle and the impedance matching system is compared,and the result shows that the energy conversion efficiency of the impedance matching system is significantly higher than that of the system with a fixed duty cycle.Based on the above research results,the hardware circuit of the impedance matching system is designed.