Effect of Rotational Speed on Pressure Pulsation Characteristics of Variable-Speed Pump Turbine Unit in Turbine Mode

The pumped storage power station plays a vital role in modern systems, where the key component is pump turbine. Variable-speed operation can improve operating efficiency of turbine and increase under conditions automatic frequency regulation capability conditions, thus obtaining higher better stability. However, its characteristics are different from many conventional units, which makes study variable-speed turbines more difficult. Therefore, this paper, 10 representative pressure monitoring points selected model to compare flow pulsation at three speeds (N1-398.57 m/s, N2-412.16 N3-428.6 m/s). According our results, it shown that maximum small low rotational speeds, means unit will maintain stability during reduction speed reducing not affect safety equipment. purpose paper provide guidance for safe effect terms dynamic behavior water units. Meanwhile, lay groundwork optimal design turbines.