The use of pumps linked in parallel or series in large scale pipe systems is usually inevitable, to meet the required head and discharge. Transient flow occurs following a pump failure in a pump group as a result of variations in the flow rate. This research is an investigation about waterhammer caused by one or more pump-switch off in a pump group when they are connected in parallel. The opera...

S-shaped characteristics in turbine mode are prone to instabilities associated transient processes. A single value of the speed factor corresponds multiple values discharge factor, having possibility changing operating point among turbine, brake, and reverse pump modes. Because this characteristic, curves induce instability Understanding hydraulic behavior a on four-quadrant characteristic is i...

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 v...

Abstract Variable speed hydroelectric units equipped with full size frequency converter (FSFC) offer high operational flexibility enabling fast operating point transitions which increase grid regulation capacities. The XFLEX HYDRO H2020 European research project aims to demonstrate of such technology at prototype scale. Z’Mutt pumping station, part the Grande Dixence scheme located in Switzerla...

Storage technologies are an increasingly crucial element in the continued expansion of renewable energy production. Micro-hydro storage using a pump as turbine is potentially promising solution certain cases, for example, extending existing photovoltaic systems (PV) and thus reducing grid load enabling economically beneficial self-consumption produced. This paper gives overview various operatin...

The energy recovery and utilization of high-pressure brine are the key to reduce cost. Reducing flow rate method (RFM) was put forward firstly adapt pump as turbine (PAT) a wide range operating conditions in this paper. In order validate advantages new method, three different designs PAT were obtained, respectively, based on methods, which were, selection design curved RFM. Based numerical exte...