摘要
在铁道车辆变频调速系统中,一般选择采用分段同步调制模式进行变频调速,在载波比切换时,SPWM电压相位可能发生突变,从而导致转矩及转速的突变,影响电机正常运行。为了解决这个问题,本文以微处理器TMS320LF2407A DSP为系统的控制核心,提出了一种抑制相位突变的基本方法———延迟切换时间,在MATLAB/SIMULINK平台上搭建变频调速系统的模型,进行分段同步调制载波比切换的仿真,在不采用任何控制方法时,电机电流冲击很大,采用延迟切换时间则能很好的抑制冲击,仿真及实验结果验证了方法的可行性。
In the inverter of railcar,it is better to use sub-synchronization modulation in variable frequency speed control,but the SPWM voltage phase may change abruptly when frequency modulation ratio which may lead torque and rotor speed changing abruptly and have a harmful effect on motor.In order to solve the problem,this paper uses TMS320LF2407A DSP as the control center and presents basic method to restrain the change of the phase： delaying the time of switch.The model of induction motor variable-frequency speed control system is built based on MATLAB/SIMULINK.In the model of Sub-synchronization modulation carrier ratio change,the stator current of motor has great concussion without any control method,while the concussion can be restrained delaying the time of switch.The simulation and experimental result confirms that the method could inhibit the impact well.
出处
《电测与仪表》
北大核心
2010年第6期73-76,共4页
Electrical Measurement & Instrumentation
