Ground Testing Platform Design Of AC Power System For XX Aircraft

Airborne AC power system is one of important power supply systems for aircraft.Its function directly affects the function of power supply system and flight safety.In the process of aircraft manufacturing,it is an important prerequisite to verify the functions of the airborne AC power system and test performance parameters to ensure the normal production,delivery and use of the aircraft.This paper takes ground test simulation experiment platform(test platform)of airborne AC power system as the study object.By designing and studying a set of ground test platform,the variable frequency driving system is designed to simulate aircraft engine rotational speed and starting torque.And the speed control methods of the most widely used variable frequency drive system composed of AC asynchronous motor and speed-increasing gearbox are studied.After that,the simulated load is designed to replace the on-board network load,and the data indicators of the alternator are collected,monitored and controlled in real time.Furthermore,a complete ground test platform for airborne power supplies is designed and implemented.Finally,the function and electrical performance of the airborne AC power system can be tested in the laboratory.The main research contents of the paper are as follows:1)Determine the overall design objective on the basis of demand analysis from the top level by fully investigating the domestic and foreign development of airborne AC power system and its testing methods.Definite tested parameter standard of the airborne AC power system and performance specification of the ground test platform;2)The mathematical modeling and control methods of the variable frequency drive system are studied,and the three-phase AC asynchronous motor and the speed-increasing gear box are respectively modeled,and then the mathematical model of the variable frequency drive system is obtained.Aiming at the undesirable factor of the non-linear characteristics of the speed increasing gearbox,on the basis of the asynchronous motor vector control method,the control method of the speed adjustment of the variable frequency drive system is studied,and the effectiveness of the designed control method is verified by simulation analysis;3)Carry out detailed design of the test platform based on the mathematical modeling and simulation analysis of the variable frequency drive system.Design the hardware and software of the ground test platform,in which the hardware part focuses on the operating principle of the system to design the variable-frequency drive and the hardware selection and combination of the cooling system in detail.Make finite element analysis on the design of the speed-increasing gear box,and model and calculate the fluid flow of the cooling system.In addition,carry out detailed design of the control circuit of operation control and test system,and the software from the drive control,system management,data testing,etc.according to the cross-linking relation of each system;4)Conduct functional debugging of the ground test platform,and optimize the corresponding test methods by solving specific problems,such as test data affected by system interference during the test process.In the end,the practice proves the test platform can meet expected design objective.