交流提升机三电平变频调速系统研究

In order to imporve the static and dynamic performance of motor,based on the working principle of H-bridge three-level inverter and mathematical model, the simplified SVPWM control algorithm and speed sensorless vector control strategy were applied to a high-power squirrel-cage AC mine Hoist to control speed precisely. The proposed closed-loop full-order rotor flux observer achieved smooth switching between the models of voltage and current, which can identify rotor flux accurately in a full range and obtain a good robustness. Combined with engineering applications, this frequency control system of Mine hoist ran smoothly and improved the capacity of Mine. The results also verify the superiority of the control methods involved.