| With the rapid development of economy and society,human beings are consuming more and more fossil energy.The problem of energy shortage will restrict the development of society.Therefore,the development and utilization of renewable energy is an effective method to solve the energy crisis.The most abundant renewable energy source on the planet is marine energy.A well-designed marine energy generating device is an important research direction for the development and utilization of marine energy.In addition,designing effective energy management control and monitoring technologies for power generating devices can improve Ocean energy utilization level.Based on the existing research of the project,this paper designs a power management control system and a monitoring system for Wave-current integrated power generation device.In this paper,the research and design of Wave-current integrated power generation device and its key components are carried out.The generator is selected and analyzed to determine the key parameters and blade structure parameters of the generator.The control strategy and power management control cabinet of the power generation system are designed to realize rectification,boosting,inverter and energy storage of unstable electric energy.The monitoring system of the power generating device is designed to realize the online collection and remote monitoring of the voltage,current,temperature and humidity information of the power generating device and the operating status of the device.The computer simulation and sea trial experiments verify the rationality and feasibility of the design.The main work of this article is as follows:(1)Research and design the wave current integrated power generation device and its key components.The type selection analysis of the generator was carried out,and the permanent magnet synchronous generator with high generating performance and low failure rate was selected to determine the key parameters of the generator.Based on the momentum-leaf theory(BEM),combined with the hydrodynamic characteristics of the turbine,the structural parameters of the blade are determined;(2)The key technologies of the circuit system are researched and analyzed,including rectifier circuits,boost circuits,DC / DC units,inverter circuits,and battery control strategies for energy storage systems.An uncontrolled rectifier circuit is designed to convert the fluctuating electric energy input into a more stable electric energy output.Boost boost circuit uses PID controller and PWM mode of voltage mode to adjust the power output of the main circuit,increase the amplitude of the output voltage,and increase the working range of the power generation system.A DC / DC converter circuit is designed to obtain DC power that meets the requirements of the equipment.A three-phase bridge-type voltage-type inverter circuit is designed to convert the DC power after the Boost circuit into AC power that can be used by the load.A charge-discharge control strategy for the battery with constant voltage and current limit was designed to avoid overcharging and overdischarging of the battery,and a half-bridge battery grouping control strategy was developed.Simulation analysis of the designed control strategy verified the rationality of the design;(3)Based on the key technology of the circuit system,a set of power management control cabinets suitable for power generation devices is designed to process,store,and utilize the power of the power generated by the power generators.The mechanical part of the power management control cabinet is designed,including the lithium battery storage layer,AC/DC conversion layer,grid-connected feedback layer,DC chopper layer,and main control unit layer.The circuit part of the power management control cabinet is designed,including the main control circuit board,threephase power detection board,DC power detection board,and DC chopper controller.The power quality of the power generation system is analyzed from five aspects: voltage deviation,frequency deviation,harmonics,three-phase imbalance,voltage fluctuation and flicker.(4)A monitoring system based on Beidou satellite is designed.The system uses GPRS wireless communication method to transmit the collected current,voltage,power and other data of the power generating device to the monitoring center.The background analysis and processing can obtain the power generating device at sea.Operation.The hardware part of the monitoring system is designed,including singlechip microcomputer,clock chip,data memory and level conversion structure.The software part of the monitoring system is designed,including the hardware analysis layer,data processing layer and application layer,to achieve remote positioning and data transmission of the device.(5)Test the power management control cabinet in the laboratory.The servo motor is selected to simulate the input of ocean energy,and the working conditions of each unit module in the system are obtained using measuring instruments and the measurement results are analyzed to verify the reliability of the design of the power management control cabinet;a reasonable test site is used to conduct a sea test of the monitoring system of the device Experiments,recording and analyzing the data returned in real time,verified the reliability of the design. |
