变频调速灯泡贯流泵性能与控制方式

变频调速作为灯泡贯流泵的一种工况调节方式已经运用于南水北调东线工程的多座泵站.为了研究变速工况下的灯泡贯流泵水力性能和控制模式,指导泵站优化运行和推广应用,针对淮阴三站和泗洪泵站这2种典型型式的机组,分析和研究了其变频变速性能及不同转速的模型试验结果,并根据有、无旁路的电气主接线2种方式,研究在考虑变频装置和电动机在不...

Performances and control mode for bulb tubular pumps with VFDs

Adjusting speed with VFDs(Variable Frequency Drives)as an operational control method has been applied in bulb tubular pumping stations in the South-to-North Water Diversion Eastern Route Project in China.In order to study the performances and control mode of bulb tubular pumps with VFDs and guide the optimal operation,popularization and application of pump stations,the variable speed performances were analyzed in theory and tested in model systems for No3 Huaiying and Sihong pumping stations in this paper.According to modes of main electrical wirings with and without the bypass,the operational control methods were studied in various working heads considering the efficiencies of VFDs and the motor in various speeds.The conclusion is that the performances of bulb tubular pumps with VFDs are restricted by the performances of impellers and flow channels.Within a certain speed range,the similarity law with constant efficiency can be used to predict the performances of bulb tubular pumps.Another conclusion is that the loss of VFDs must be considered when determining the operation performances of the bulb tubular pump unit.At the same time,the changes in the efficiency of VFDs and motor caused by the change of frequency should be analyzed.And after considering the loss of VFDs and motor caused by the change of frequency,there are higher efficiencies without VFDs when the working head is about 40%-80%design head of water supply in Sihong Pumping Station.