| With the promotion and development of the national new energy strategy,aluminum air battery has become one of the hotspots of research and development of new energy batteries due to its light weight,small size,safety and efficiency,environmental protection and energy saving,low operating temperature and no need for charging.However,the output voltage of the aluminum air battery is unstable and the dynamic characteristics are poor,which restricts its practical application in some occasions.Therefore,designing a DC/DC converter for aluminum air battery,stabilizing the output voltage and improving the conversion efficiency,can make the aluminum air battery have a broader market prospect in the new energy field and practical application value.The aim of this research is to study the performance of aluminum air battery.Firstly,the performance of aluminum air battery is tested and analyzed.According to the design requirements of high performance,high efficiency and high power density,the full-bridge LLC resonant topology is selected as the main circuit of the aluminum air battery power converter,It can realize the primary switch turn on at zero voltage in the range from no load to full load and secondary rectifier diode turn off at zero current.In order to improve the response speed of the converter,a voltage feed-forward control method is proposed.The modulation coefficient generated by the voltage feed-forward can make the power converter of the aluminum air battery respond promptly to the voltage fluctuation at the input end and improve the dynamic performance index of the power converter of the aluminum air battery.According to the discharge characteristics of the aluminum air battery,the integral separation PID control is adopted.When the deviation is large,the integral effect is cancelled to improve the response speed of the system.When the deviation is small,the PID control is used to ensure output voltage of aluminum air battery power converter is accurate.Then,the parameters of the PID are adjusted in real time by fuzzy control.The integrated separation PID and fuzzy control are combined and applied to the control system of the power converter of the aluminum air battery,which makes the system make the system well controlled.Finally,the equivalent circuit model of aluminum air battery is established in MATLAB/Simulink simulation environment.The effectiveness of the programme is verified by simulation of aluminum air battery power converter.The experimental prototype based on STM32 is built,and the performance of the prototype is tested.The test results basically meet the design requirements. |
