• Dynamic load on a Francis turbine runner from simulations based on measurements 

      Storli, Pål-Tore Selbo; Nielsen, Torbjørn Kristian (Journal article; Peer reviewed, 2014)
      The frequency of the Nordic power grid has become more volatile during recent years. This gives rise to two effects in synchronous machines. Firstly, as grid frequency changes the rotational speed of synchronous machines ...
    • Measurements and simulations of turbines on common grid 

      Nielsen, Torbjørn Kristian; Storli, Pål-Tore Selbo (Journal article; Peer reviewed, 2014)
      Speed droop control is of basic importance for the primary governing in the Nordic grid. The speed droop control. a mandatory and build-in regulatory loop on all larger units. is automatically changing the produced power ...
    • Model Order Reduction Technique Applied on Harmonic Analysis of a Submerged Vibrating Blade 

      Tengs, Erik Os; Charrassier, Flora; Storli, Pål-Tore Selbo; Holst, Martin (Journal article; Peer reviewed, 2019)
      As part of an ongoing study into hydropower runner failure, a submerged, vibrating blade is investigated both experimentally and numerically. The numerical simulations performed are fully coupled acoustic-structural ...
    • Optimization procedure for variable speed turbine design 

      Tengs, Erik Os; Storli, Pål-Tore Selbo; Holst, Martin (Journal article; Peer reviewed, 2018)
      This article outlines a design procedure for variable speed Francis turbines using optimization software. A fully parameterized turbine design procedure is implemented in MATLAB. ANSYS CFX is used to create hill diagrams ...
    • Simulations of the dynamic load in a francis runner based on measurements of grid frequency variations 

      Ellingsen, Rakel; Storli, Pål-Tore Selbo (Journal article; Peer reviewed, 2015)
      In the Nordic grid, a trend observed the recent years is the increase in grid frequency variations, which means the frequency is outside the normal range (49.9-50.1 Hz) more often. Variations in the grid frequency leads ...