Research On Power Hardware-in-the-loop Brushless DC Motor Simulation System

Under laboratory conditions,motor driver power level test scheme usually adopts the motor towing platform of "motor driver under test-motor-generator",which has high cost,low flexibility and poor ability to simulate different load characteristics.Aiming at the disadvantages of the traditional motor towing test platform,the Power Hardware In The Loop(PHIL)test platform emerged to replace the real motor to complete the power level test of the motor driver,which has attracted widespread attention in recent years.The PHIL motor simulator is connected to the motor driver under test,and can reproduce the real motor voltage and current without changing the hardware system of the motor driver under test,so as to achieve the purpose of power level test of the driver.This paper focuses on the research of BLDCM simulator,and mainly carries out the following work:Firstly,by comparing the voltage equation of the actual BLDCM system with that of the simulation system,a method of simulating the neutral point potential of the motor is proposed.When the three-phase voltage of the simulator meets certain constraints,the neutral point potential of the simulator bus is consistent with the neutral point potential of the motor.From the Angle of current tracking,the relationship between the value of filter inductance in motor simulation system and the inductance of actual motor winding is analyzed.Based on the above analysis,the BLDCM simulation system model is established,including the voltage equation of motor control system,the voltage equation of simulation system and the real-time solution model of target motorThen,two simulation strategies based on equal rate of change of current and model predictive control and their improvement schemes are introduced.Based on simulation strategy mathematical equation is derived,simulation proves that the two strategies to simulate the actual motor port voltage characteristic,including the conduction band,which meet the test requirements of sensorless control,stability analysis and the simulation strategy,finally,the simulation results were analyzed,and the correctness of the simulation proves that the stated strategy.Finally,the semi-physical experimental system of BLDCM simulation system was established based on the self-assembled RTU-Box and RT-Lab semi-physical experimental platform.The running results of the simulation model of BLDCM are analyzed and the simulation results are consistent with the above analysis.A low-power hardware-in-the-loop experiment is carried out.The experimental results show that the motor simulation system presented in this paper can simulate the electrical characteristics of the target motor port.