变频调速的灯泡贯流泵站借助于变频装置逐步降低机组转速,实现机组的安全平稳停机.分析了变频调速机组的正常停机特点,建立停机过程的水量平衡和力矩平衡动态方程.根据变频装置的特性设置转速的变化规律,通过数值模拟停机过程中主要水力参数的变化特征,寻求转速变化规律、起始时刻与闸门关闭时间之间的最佳匹配,为变频调速灯泡贯流泵站的安全稳定运行提出了不同停机规律的建议.%The shut-down process of bulb tubular pumping station with VFD will be a stabile and safe transient process through the speed lowing gradually. The features of normal shut-down process with VFD were analyzed. The flowing rate balance and torque dynamic balance equations were established. According to the characteristics of the VFD, the speed lowing law was designed and the main hydraulic parameters were simulated during the shut-down transient period by the numerical calculation, the optimal combination between the speed-lowing, the starting time point and closing time of the gate was discovered. The findings of the study provided various shut-down suggestions for safety and stability operation of bulb tubular pumping stations with VFD.
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