Power Vision Engineering had 1 contribution at the SHF Conference «Pumped storage Powerplants», Lyon, 23-24 November 2011:

• PAPER: NICOLET, C., ALLIGNE, S., BERGANT, A., AVELLAN, F.,"Parametric study of Water column Separation in Francis Pump-turbine draft tube".

A visit of the Grand Maison Pumped storage power plant with 8x155MW multi-stage Francis pump-turbines and 4x157MW Pelton turbines was organized before the conference, see picture.

Power Vision Engineering had 2 contributions at the 4^th IAHR International Meeting of the Workgroup on Cavitation and Dynamic Problems in Hydraulic Machinery and Systems October 26-28, 2011, in Belgrade, Serbia.:

• PAPER 1: NICOLET, C., KAELBEL, T., ALLIGNE, S., RUCHONNET, N., ALLENBACH, P., BERGANT, A., AVELLAN, F., "Simulation of Water Hammer Induced Column Separation through Electrical Analogy".



• PAPER 2: ALLIGNE, S., NICOLET, C., AVELLAN, F., "Identification by CFD Simulation of the Mechanism Inducing Upper Part Load Resonance Phenomenon".

The conference was followed by a post conference tour to visit the Hydroelectric complex of Bajina Basta on the Drina river in Serbia, comprising a conventional hydroelectric power plant of 4x106MW Francis turbines and a pumped-storage power plant of 2x307MW Francis pump-turbines, see pictures.

Power Vision Engineering had two contribiutions and held a stand together with the EPFL-LMH and AquaVision Engineering at the International Conference HYDRO 2011, October 17-19, 2011, in Prague, Czech Republic.

• PAPER: NICOLET, C., PANNATIER, Y., KAWKABANI, B., SIMOND, J.-J., AVELLAN, F., "Hydroelectric Interactions with Variable Speed and Fixed Speed Machines in Pumping Mode of Operation".



• PAPER: ZOBEIRI, A., NICOLET, C., VUADENS, E., "Risk analysis of the transient phenomena in a hydropower plant installation".



• STAND 62: see picture.

Power Vision Engineering co-author at HydroVision International July 19-22, 2011, in Sacramento, CA, USA:

• PAPER: KOUTNIK, J., BRUNS, M., MEIER, L., NICOLET, C., "Pumped Storage - Grid Requirements For Behavior of Large Motorgenerators and Confirmation Of Compliance Through Simulation".

Power Vision Engineering presented a paper and held a stand together with the EPFL-LMH and AquaVision Engineering at the International Conference HYDRO 2010, September 27-29, 2010, in Lisbon, Portugal.

• PAPER: C. NICOLET, R. BERTHOD, N. RUCHONNET, F. AVELLAN, "Evaluation of Possible Penstock Fatigue Resulting from Secondary Control for the Grid".



• STAND 703: see picture.

The conference was followed by Study Tour A to visit the Alqueva I pumped storage power plant (2x130MW) where new capacity of Alqueva II is under construction (2x128MW).

Power Vision Engineering presented two papers at the 25^th IAHR International Symposium on Hydraulic Machinery and Systems, September 20-24, 2010, in Timisoara, Romania.

• PAPER 1: C. NICOLET, A. ZOBEIRI, P. MARUZEWSKI, F. AVELLAN "On the Upper Part Load Vortex Rope in Francis Turbine: Experimental Investigation".



• PAPER 2: C. NICOLET, N. RUCHONNET, S. ALLIGNE, J. KOUTNIK, F. AVELLAN "Hydroacoustic Simulation of Rotor-Stator Interaction in Resonance Conditions in Francis Pump-Turbine".

Power Vision Engineering had 1 contribution at HydroVision International July 27-30, 2010, in Charlotte, NC, USA:

• PAPER: KOUTNIK, J., FOUST, J., NICOLET, C., SAIJU, R., KAWKABANI, B., "Pump-Storage Integration with Renewables – Meeting the Needs Using Various Concepts".

Power Vision Engineering had 3 contributions at the 3^rd IAHR International Meeting of the Workgroup on Cavitation and Dynamic Problems in Hydraulic Machinery and Systems October 14-16, 2009, in Brno, Czech Republic.:

• PAPER 1: C. NICOLET, S. ALLIGNÉ, B. KAWKABANI, J. KOUTNIK, J.-J. SIMOND, F. AVELLAN, "Stability Study of Francis Pump-Turbine at Runaway".



• PAPER 2: S. ALLIGNÉ, C. NICOLET, N. RUCHONNET, V. HASMATUCHI, P. MARUZEWSKI, F. AVELLAN, "Numerical Simulation of Non-linear Self-oscillations of a Full Load Vortex Rope".



• PAPER 3: N. RUCHONNET, C. NICOLET, S. ALLIGNÉ, F. AVELLAN, "Experimental investigation of Cavitation Influence on Hydroacoustic Resonance in Pipe".

During the post conference tour, we visited the pumped-storage power plant of Dalesice in Czech Republic of 4x120MW, see pictures.

Power Vision Engineering presented a paper and held a stand at the International Conference HYDRO 2009, October 26-28, 2009, in Lyon, France.

• PAPER: C. NICOLET, Y. PANNATIER, B. KAWKABANI, A. SCHWERY, F. AVELLAN, J.-J. SIMOND, "Benefits of Variable Speed Pumped Storage Units in Mixed Islanded Power Network during Transient Operation".



• STAND 041: see picture.

Power Vision Engineering had 4 contributions at the 24^th IAHR International Symposium on Hydraulic Machinery and Systems, October 27-31, 2008, in Foz Iguassu, Brazil:

• PAPER 1: C. NICOLET, S. ALLIGNÉ, B. KAWKABANI, J.-J. SIMOND, F. AVELLAN, "Unstable Operation of Francis Pump-Turbine at Runaway: Rigid and Elastic Water Column Oscillation Modes".



• PAPER 2: Y. PANNATIER, C. NICOLET, B. KAWKABANI, J.-L. DENIAU, A. SCHWERY, F. AVELLAN, J.-J. SIMOND, "Transient Behavior of Variable Speed Pump-Turbine Units".



• PAPER 3: S. ALLIGNÉ, C. NICOLET, P. ALLENBACH, B. KAWKABANI, J.-J. SIMOND, F. AVELLAN, "Influence of the Vortex Rope Location of a Francis Turbine on the Hydraulic System Stability".



• PAPER 4: C. CHEN, C. NICOLET, K. YONEZAWA, M. FARHAT, F. AVELLAN, Y. TSUJIMOTO, Y., "One-Dimensional Analysis of Full Load Draft Tube Surge Considering the Finite Sound Velocity in the Penstock".

Power Vision Engineering presented a paper and held a stand at the International Conference HYDRO 2008, October 6-9, 2008, in Ljubljana, Slovenia.

• PAPER: C. NICOLET, Y. VAILLANT, B. KAWKABANI, P. ALLENBACH, J.-J. SIMOND, F. AVELLAN, "Pumped Storage Units to Stabilize Mixed Islanded Power Network: a Transient Analysis".



• STAND 218: see picture.

Power Vision Engineering launches OptiPower, a custom designed software to optimize the energy production of a power plant. OptiPower is divided in two parts:

• 1) OptiPower Calculator: to select the best operating set points of a hydroelectric power plant according to operating constrains;



• 2) OptiPower Forecast: to optimize power generation strategy over 24/48/72 hours.

The demo version of SIMSEN-Hydro is now available and includes the following models:

• Kaplan turbine
• Pelton turbine
• Francis pump-turbine
• Cavitation compliance
• Surge tanks, surge shaft
• Air vessel, surge vessel
• Pressure sources
• Valves
• Pipe, viscoelastic pipes
• all the electrotechnical modules
• etc

Power Vision Engineering presented a paper at the 2^nd IAHR International Meeting of the Workgroup on Cavitation and Dynamic Problems in Hydraulic Machinery and Systems October 24-26, 2007, in Timisoara, Romania.


During the post conference tour, the visit of the Iron Gates I power plant, equipped with Kaplan turbine with total power of 2'200 MW shared between Serbia and Romania was organized; see picture of the spillway.

Power Vision Engineering was present at the LMH desk at HYDRO 2007 October 15-17, 2007, in Granada, Spain; see picture of the stand.