Research On Control Strategy Of Power Supply System For Arctic Field Monitoring Device

With the continuous expansion of the scope of human activities and the leap forward development of technology,global climate change has increased significantly.The Arctic region,centered on the Arctic Ocean,occupies an important position in the global cold and heat cycle,and conducting an Arctic survey is of great significance for humans to understand the changes in the earth's ecological environment and the process of sustainable development.At present,Arctic expeditions are mainly divided into ship-based expeditions and unmanned automatic monitoring device expeditions in summer.Automatic monitoring devices are generally installed on the Arctic ice and drift with sea ice all year round.The power supply mainly relies on battery technology.The automatic monitoring device is generally installed on the Arctic ice,drifting with the sea ice all year round,and the power supply mainly depends on battery technology,but the long-term low temperature environment will seriously shorten the battery life,which brings great difficulties to the complete acquisition of scientific data,and the battery cannot be replaced and recovered in time when it is damaged or the power is insufficient,which has an impact on the Arctic ecological environment.Therefore,it is imperative to study the renewable energy power supply technology of the Arctic field monitoring device.Based on the full research on the development status of the Arctic hybrid energy power supply system,combined with the distribution of Arctic renewable energy,aiming at the power demand of the field monitoring device,this paper studies the control strategy of the Arctic field monitoring device power supply system based on wind,photovoltaic and ocean currents.Firstly,a simulation model of the wind turbine of the direct-drive permanent magnet synchronous wind power generation system in the power supply system is established,and the characteristic curves of the wind turbine under different pitch angles are analyzed.In order to achieve the stable output of the wind power generation system under full wind conditions,different control strategies are proposed for different operating regions of the Variable-speed Constant-frequency permanent magnet synchronous power generation system,and the duty cycle disturbance based on the hill climbing search method is used to achieve the maximum power tracking(MPPT),using the speed power PI adjustment to control the pitch angle to achieve reduced power output.Through the establishment of a wind power generation system simulation model in Matlab/Simulink,the output of the system under sudden wind speed and simulated wind speed in the Arctic field is analyzed,and the simulation verifies the effectiveness of the control strategy.Secondly,combined with the low temperature environment of the Arctic,the control of the photovoltaic power generation system in the power supply system is studied.A photovoltaic simulation model based on environmental correction was established,and the influence of low temperature and light intensity on the output characteristics of the photovoltaic power generation system was analyzed.According to the parameter characteristics at the maximum power of the characteristic curve,a simulation model of the photovoltaic power generation system in a low temperature environment was established.The improved adaptive disturbance observation method is adopted to realize the maximum power tracking control,and the voltage and current PI adjustment control is adopted to realize the constant voltage control,which greatly improves the utilization rate of light energy and ensures the constant voltage of the power supply system.Then,combined with the arctic ocean current flow rate,the control strategy of ocean current power generation system based on horizontal axis and PWM rectifier structure is proposed.Through the establishment of a hydraulic turbine model and analysis of the principle of maximum ocean current energy capture,around the control method of the PWM converter,the mathematical model of PMSG in the dq coordinate system is established by coordinate transformation,and a control strategy combining MPPT and dual current inner loop control is proposed.By establishing a horizontal axis ocean current power generation system model to simulate the changes in the arctic ocean current flow rate,it is verified that the ocean current power generation system can quickly respond to changes in ocean current flow rates and achieve the maximum ocean current energy capture.Finally,through the research on the distribution of renewable energy and the actual demand of the power supply system under the special climate conditions of the Arctic,the overall structure of the power supply system of the Arctic field monitoring device was designed and the principles of energy management were established.The energy management and operating status of the power supply system during the extreme day and night period are analyzed separately,and the coordinated control strategy of the power supply system of the Arctic field monitoring device based on wind,wind,ocean current energy is proposed.The experimental platform verifies that the power supply system can achieve energy balance and voltage stability under the control strategy,which can enhance the discharge performance of battery in extreme environment,extend its service life,and ensure the reliability and continuity of power supply system of Arctic field monitoring device.