炼钢转炉除尘风机系统是炼钢生产除尘系统的主要设备。为了保证该设备的正常运行，避免因供电异常带来的安全事故与经济损失，研究了一种转炉风机供配电系统双电源切换装置。分析了该转换装置的电压异常检测方法、转换时机的选择和触发控制策略，并基于MATLAB/Simulink进行了仿真，证明了备用电源与剩余感应电动势间的相位角差与动态切换策略的正确性。

The steelmaking converter dusting fan system is the main equipment of the steelmaking production dusting system. In order to ensure the normal operation of the equipment and avoid safety accidents and economic losses caused by abnormal power supply, a dual power supply switching device for the converter fan power supply and distribution system is proposed. The voltage abnormality detection method, switching timing selection and triggering control strategy of the switching device are analyzed. A simulation example based on MATLAB/Simulink proves the correctness of the phase angle difference between the standby power supply and the residual induced electromotive force and the dynamic switching strategy.