基于晶闸管移向控制的给水泵电机重载启动

Heavy-Load Start-Up of Water Pump Motor Based on Thyristor Shift Control

针对三相异步电动机启动时,启动电流大,母线压降过大的问题,设计了一种针对重载启动的软起动控制系统。首先,基于电机控制理论,设计软起动控制系统,搭建脉冲发生模块、三相调压模块和PID(Proportional-Integral-Derivative)闭环,对异步电机机端电流和电压进行闭环控制;其次,基于Simulink软件,根据黑龙江省某燃煤机组给水泵电机实际数据,搭建软起动控制模型,进行仿真分析;最后,进行现场测试,测试结果与仿真结果相似,结果表明该模型可在重载启动的情况下,有效限制异步电动机启动电流,减小给水泵电机启动对母线上其他设备的影响,为异步电动机重载启动提供参考。

Aiming at the problems of large starting current and bus voltage drop when three-phase asynchronous motor starts, a soft starting control system for heavy-load starting is designed. First of all, based on the motor control theory, the pulse generation module, three-phase voltage regulation module and PID(Proportional-Integral-Derivative) control closed loop are built, and the soft start control system is designed to control the terminal current and voltage of the asynchronous motor. Secondly, based on the Simulink software, according to the actual data of the feed pump motor of a coal-fired unit in Heilongjiang Province, the soft start control model is built and simulated. Finally, the field test is carried out, and the test results are similar to the simulation results. The results show that the model can effectively limit the starting current of asynchronous motor and reduce the influence of water pump motor start-up on other equipments at the busbar under the condition of heavy load starting. It provides a reference for the heavy-load start-up of the asynchronous motor.