International Journal of Fluid Machinery and Systems

한국유체기계학회 (Korean Society for Fluid machinery)
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Unstable Operation of Francis Pump-Turbine at Runaway: Rigid and Elastic Water Column Oscillation Modes

  • Nicolet, Christophe (Power Vision Engineering sarl, 1 ch. des Champs-Courbes) ;
  • Alligne, Sebastien (Laboratory for Hydraulic Machines, Ecole Polytechnique Federale de Lausanne, EPFL) ;
  • Kawkabani, Basile (Laboratory of Electrical Machines, Ecole Polytechnique Federale de Lausanne, EPFL) ;
  • Simond, Jean-Jacques (Laboratory of Electrical Machines, Ecole Polytechnique Federale de Lausanne, EPFL) ;
  • Avellan, Francois (Laboratory for Hydraulic Machines, Ecole Polytechnique Federale de Lausanne, EPFL)
  • 심사 : 2009.05.27
  • 발행 : 2009.12.01
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초록

This paper presents a numerical simulation study of the transient behavior of a $2{\times}340MW$ pump-turbine power plant, where the results show an unstable behavior at runaway. First, the modeling of hydraulic components based on equivalent schemes is presented. Then, the 2 pump-turbine test case is presented. The transient behavior of the power plant is simulated for a case of emergency shutdown with servomotor failure on Unit 1. Unstable operation at runaway with a period of 15 seconds is properly simulated using a 1-dimensional approach. The simulation results points out a switch after 200 seconds of the unstable behavior between a period of oscillations initially of 15 seconds to a period of oscillation of 2.16 seconds corresponding to the hydraulic circuit first natural period. The pressure fluctuations related to both the rigid and elastic water column mode are presented for oscillation mode characterization. This phenomenon is described as a switch between a rigid and an elastic water column oscillation mode. The influence of the rotating inertia on the switch phenomenon is investigated through a parametric study.

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참고문헌

  1. Dorfler, P. K., Engineer, A. J., Pendse, R. N., Huvet, P., and Brahme, M. V., 1998, “Stable operation achieved on single-stage reversible pump-turbine showing instability at no-load”. In Proceeding of the 19th IAHR Symposium on Hydraulic Machinery and Systems (Singapore), pp. 430–440.
  2. Huvet, P., 1992, “Steady oscillation between pump-turbine operating at partial flow and surge shaft”, In Proc. 16th Symposium of the IAHR, Sao Paola, Brazil.
  3. Jaeger, R. C., 1977, "Fluid transients in hydro-electric engineering practice ".Glasgow: Blackie.
  4. Liu, X., Liu, C., 2007, “Eigenanalysis of Oscillatory Instability of a Hydropower Plant Incuding Water Conduit Dynamics”, In IEEE Transactions on Power Systems, vol. 22, No. 2. https://doi.org/10.1109/TPWRS.2007.895156
  5. Martin, C. S., 1986, “Stability of pump-turbines during transient operation”. In Proceedings of the 5th Int. Conf. on Pressure Surges (Hannover, Germany), pp. 61-71. paper C3.
  6. Martin, C. S., 2000, “Instability of pump-turbines with s-shaped characteristics”. In Proceeding of the 20th IAHR Symposium on Hydraulic Machinery and Systems (Charlotte, USA).
  7. Nicolet, C., 2007, “Hydroacoustic modelling and numerical simulation of unsteady operation of hydroelectric systems”, Thesis EPFL $n^{\circ}$ 3751, (http://library.epfl.ch/theses/?nr=3751).
  8. Paynter, H. M., 1953, “Surge and water hammer problems”. Transaction of ASCE, vol. 146, pp. 962-1009.
  9. Pejovic, S., Krsmanovic, L., Jemcov, R., Crnkovic, P., 1976, “Unstable operation of high-head reversible Pump-Turbines”. In Proceeding of the 8th IAHR Symposium on Hydraulic Machinery and Systems, Leningrad, pp. 283-295.
  10. Taulan, J. P. 1983, “Pressure surges in hydroelectric installations - Peculiar effects of low specific speed turbine characteristics”. Proc. 4th BHRA Int. Conf. on Pressure Surges, Bath, Paper H2, pp. 337-351.
  11. Sapin, A., 1995, “Logiciel modulaire pour la simulation et l'etude des systemes d'entraînement et des reseaux electriques”, Thesis EPFL $n^{\circ}$ 1346, (http://library.epfl.ch/theses/?nr=1346).
  12. Souza, O.H., Jr.; Barbieri, N.; Santos, A.H.M., 1999, “Study of hydraulic transients in hydropower plants through simulation of nonlinear model of penstock and hydraulic turbine model,” IEEE Transactions on Power Systems, vol. 14, issue 4, pp. 1269-1272. https://doi.org/10.1109/59.801883
  13. Wylie, E. B. & Streeter, V.L., 1993, “Fluid transients in systems”. Prentice Hall, Englewood Cliffs, N.J.

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