基于恒定电流策略的电动机软启动系统研究

Research on the Soft Starting System Based on Constant Current Strategy

针对高压大功率电动机启动电流过大问题,提出了一种基于电力电子电抗器的软启动限流与补偿一体化方法,为了保证启动过程中有足够大的启动转矩,并能将启动电流限制在设定的范围,采用恒定电流策略对软启动控制系统进行了设计。在仿真阶段,针对电动机铭牌数据与仿真参数不一致问题,提出了一种实用的电动机参数离线计算方法,该方法可以方便、准确地获得电动机的仿真参数。最后,仿真和试验结果验证了该软启动系统良好的启动性能。

There is too large starting current when high-voltage large motors started up direct-on line,it will cause many damages.In order to solve these problems,a soft starting method which adopted power electronic reactor in its main circuit was designed.In order to ensure a sufficient starting torque and limit the starting current to a set range in the starting process,the constant current strategy was designed.In the system simulation stage,a practical motor parameter offline identification method was proposed for the inconsistency between the motor nameplate data and the simulation parameters.The simulation parameters of the motor could be obtained conveniently and accurately in this method.Finally,simulation and experiment results verify that the soft starter system has excellent starting performance.