Design Of Energy Conversion System For Magnesium Seawater Batteries

In recent years,China has vigorously promoted the research pace of marine hydrology,meteorological observation,and marine communication related technologies to improve the informatization level of marine monitoring in China.As a carrier platform for ocean exploration and communication equipment,ocean buoys need to have the ability to provide independent power supply for equipment on the platform due to their distance from the mainland power grid.Therefore,how to achieve continuous power supply for marine buoy carrying equipment has become the focus of attention in the industry.As a new type of battery,magnesium seawater battery has the advantages of low cost,green environmental protection,high specific energy,and can work in the deep sea.It is suitable for installation in marine buoys to provide power for onboard monitoring and communication equipment.However,actual research has found that magnesium seawater battery monomer has shortcomings such as low voltage,slow dynamic response speed,and soft output characteristics.In order to make up for the shortcomings of magnesium seawater batteries,a scientific energy conversion system was designed to improve the practicality of magnesium seawater batteries.Firstly,the classification,structure,working principle,and characteristics of magnesium seawater batteries were introduced,and the effects of external factors on battery performance were summarized.The impact of electrode material on the discharge performance of magnesium seawater batteries was analyzed.At the same time,the measured discharge and power characteristic curves of magnesium seawater batteries were analyzed,and it was found that magnesium seawater batteries have problems such as low monomer voltage and soft power characteristics.Then,based on the characteristics of magnesium seawater batteries,an improved non isolated three port converter was constructed.The working principle and steady-state performance of TPC under different operating modes were analyzed in detail,and it was found that the improved TPC can increase the voltage gain by two times and significantly reduce voltage stress.According to the needs of later experiments,the converter parameters were designed theoretically,and the theoretical analysis of the working principle and steady-state performance of TPC was verified through simulation of the converter.Finally,considering the operating characteristics and load mutation rules of magnesium seawater batteries,a system energy optimization control strategy based on topology is proposed,which can achieve dynamic balance between source and load power;At the same time,according to the low power discharge characteristics of magnesium seawater batteries,a maximum power point tracking method based on the improved Grey Wolf algorithm is proposed to further improve the energy conversion efficiency of magnesium seawater batteries.On this basis,in order to reduce the overshoot of the system and improve the stability of the load supply,the Back Propagation neural network method is used to optimize the parameters of the traditional PID controller online,further improving the control effect of the system.The principle and control strategy of TPC are simulated using MATLAB/Simulink.A principle prototype was built to simulate the intermittent operation of ocean buoy loads through resistance switching,proving the stability and rationality of the system.