Research On Simulation System Of Variable Parameter PMSM

Permanent Magnetic Synchronous Machine(PMSM)has the advantages of simple structure,low operating loss,high safety and mature control strategy,and is widely used in automobiles,aerospace,wind power,ships and other fields.Due to the wide range of permanent magnet synchronous motors,performance testing of different permanent magnet synchronous motors is crucial.The construction of the traditional motor test platform needs to rely on real motors,use real motor parameters to build related facilities,and need to use different types of mechanical loads to cooperate with the test,but also need to be equipped with high-power DC power supply,the test process is very cumbersome and automation is extremely difficult,the consumption of manpower and material resources is great.The motor simulation system is designed to solve this problem by simulating the port output characteristics of the real motor in different operating states in a real-time simulation device instead of the real motor for testing.The motor simulation system is improved for the shortcomings of the traditional motor test system,such as large size,large space occupation,long test cycle of single motor,and high test cost.The motor simulation system in the existing research optimizes the motor parameters and ignores the parameter changes in the motor operation process,resulting in the difference between the designed motor simulation system and the real motor.In view of the above problems,this thesis designs a permanent magnet synchronous motor simulation system with real-time parameter changes,which considers the influence of motor parameters caused by magnetic saturation,cross-coupling and temperature rise caused by loss during the operation of permanent magnet synchronous motor,and the key parameters of the motor caused by the nonlinear motor characteristics are calculated by finite element simulation,and its nonlinear characteristics are reflected by the changes of the inductance,resistance and other parameters of the motor,and the nonlinear mathematical model of the permanent magnet synchronous motor with parameter changes is analyzed.The Adams method is used to carry out discretization processing,the fcn function is used to calculate the motor state quantity and current command value,and the current port characteristics of the motor are tracked in real time by the power electronic converter,and finally the purpose of using the power electronic converter to simulate the motor port characteristics is achieved.At the same time,the grid-connected energy feed converter is designed to realize the overall system power factor grid-connected.The overall simulation of variable parameter permanent magnet synchronous motor simulation system was built in MATLAB/Simulink,and the experimental verification of the relevant simulation was carried out,and the results showed that the motor simulation system had a very high fit for the calculation of motor state quantity,and the port characteristics of the power electronic converter had a high fit with the port characteristic curve of Simulink’s own motor model.At the same time,the comparison between the variable parameter simulation system and the fixed parameter simulation system can reflect the influence of the parameter input considering nonlinear factors on the motor state quantity and subsequent port characteristics simulation in the variable parameter system.