DescriptionThe headrace surge tank for the 880 MW pumped storage power plant in Portugal is tested in a 1:25 Froude scaled physical model test in the hydraulic laboratory at Graz, University of Technology. The surge tank is designed to allow 90s full loading and 90s unloading of all four pump turbine units in mass oscillation resonance with subsequent full load rejection in generating mode at capacity level and draw down level of the head water reservoir. The surge tank is also designed to withstand full load pump trip event for mass oscillation and water hammer. The surge tank consists of three shafts: The differential main shaft as water reservoir with an internal diameter of 21 m and throttled connected to the pressure tunnel, the main riser, unthrottled with internal diameter of 8 m and an aeration shaft with 1.5m diameter behind the gate to allow maintenance and aeration of the pressure shaft in case of emergency closing. In surge tank model is run by transient discharge as boundary condition. The input discharges are generated by 1D numerical simulation that is transposed via PID controlled air valves to the surge tank model itself since the water mass of the pressurized tunnels are not represented.
|Period||23 Apr 2019|
|Event title||3rd International Seminar on Hydraulic Engineering and High Head Hydropower|
|Location||Graz, AustriaShow on map|
|Degree of Recognition||International|