Research On Control Strategy Of Aviation Medium Frequency Ground Power Supply

According to the national requirements,by 2030,China’s domestic carbon dioxide emissions will be reduced by more than 65% compared with 2005.Energy-saving and emission reduction programs in various industries have been vigorously implemented.In recent years,domestic airports have increased the promotion of "oil to electricity" to provide electric energy for ground aircraft,and the "oil to electricity" program has taken the lead in developed countries.In this paper,the self-developed aviation intermediate frequency power supply replaces the traditional ground diesel generator vehicle to provide 400 Hz AC energy storage power supply for ground aircraft.With the development of power electronics technology and energy storage technology,the research of aviation intermediate frequency ground power has been moving towards high power,integration and energy storage.In this paper,the rectifier and inverter are analyzed in depth for the AC-DC-AC topology used in aviation intermediate frequency ground power supply.In order to ensure that the aviation intermediate frequency ground power supply rear stage inverter can output stable and high quality 115V/400 Hz intermediate frequency alternating current,so that the load in the full range of 0～400% operation,high conversion efficiency.A dynamic DC bus control strategy is studied for the three-phase rectifier at the front stage.Based on the traditional double-closed loop PI control strategy,the optimal DC bus voltage reference value suitable for the current system operating state is found through the input voltage and load power of the grid side,and then the dynamic DC voltage is adjusted.Secondly from the ground at the time of the aircraft power supply,power supply transmission cable impedance voltage drop,unable to provide reliable and stable voltage for aircraft,this paper adopted a kind of voltage compensation characteristics of inverter control strategy,the strategy using the voltage compensation loop,voltage outer loop and deadbeat current for control,the inner ring by adopting cable voltage feed-forward compensation control strategy,The output voltage of the inverter system is increased to compensate the cable voltage drop,so as to meet the requirement of providing stable electricity of 115 V/400 Hz for aircraft equipment.This paper analyzed the control of software and hardware of the platform,including based on ARM + FPGA control scheme of task assignment and the design of the main program,detailed discussed the distribution of power conversion circuit,IGBT drive circuit,sampling circuit and so on,also discussed the ADC software filtering,cooling system software process and software such as human-computer interaction design.At the end of the paper built A 90 k VA aviation medium frequency power experiment platform on the ground.The experimental results show that rectifier in high load reduced the loss of equipment,improve the conversion efficiency of the equipment,and 25% overload in A phase,the inverter output current was reduced by 11.27% than the traditional control strategy,improve the ability of the output of the converter;Under low load,the conversion efficiency is increased by 1%～3%.After real-time compensation of voltage drop of the output cable,the output voltage of the inverter is stable,and the total voltage distortion rate THD value is only 3.2%,and the voltage quality meets the demand of aircraft electricity.