基于DSP的逆变器分段同步调制算法的研究.pdfVIP

学兔兔 总第47卷 第534期 电测与仪表 VoL47 No．534 2010年 第o6期 Electricai MeasurementInstrumentation Jun．20l0 基于DSP的逆变器分段同步调制算法的研究 谷杨心 (北京交通大学电气工程学院，北京 100044) 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 MA TI_JAB／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。 关键词：分段同步调制；SPWM；逆变器；MATLAB／Simulink 中图分类号：TM464 文献标识码：A 文章编号：1001—1390(2010)06—0073—04 Sub-synchrony Modulation Method Study of Inverter Based on DSP GU Yang—xin (School of Electrical Engineering，Beijing Jiaotong University，Beijing 100044，China) Abstract：In the inverter of railear，it iS better to use sub—synchronization modulation in variable frequency speed contro1．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 wel1． Key words：sub-synchronization modulation，SPWM．inverter．MATLAB／Simulink 0 引 言