Ahmet Selim PEHLİVAN, Dario KRALJEVIC, Ivan TRIPLAT, Beste BAHÇECİ

Critical speed calculation of a refurbishment of 11MW hydro power plant unit

Hydro generator design is a significant issue in terms of safety, efficiency, and energy production sustainability. One of the most crucial issues about design criteria is to satisfy the needs of the project’s critical speed. In this work, the critical speed calculation of an 11 MW hydro power plant was investigated with several design steps. Numerical solution methodologies were implemented using ARMD™. A generator design was developed, and the implementation of the rotor was carried out in Antalya, Turkey. Vibration and displacements of the hydro generator are adequate. The generator unit is active for 3 years and have never encountered runaway speeds. No critical speed or resonance speed is anticipated for the designed hydro generator unit.

PDF

___

[1] Beires P, Vasconcelos MH, Moreira CL, Lopes JAP. Stability of autonomous power systems with reversible hydro power plants: a study case for large scale renewables integration. Electric Power Systems Research 2018; 158: 1–14. doi:10.1016/j.epsr.2017.12.028
[2] Nicolet C, Kawkabani B, Greiveldinger B, Herou J, Allenbach P et al. Turbine speed governor parameters validation in islanded production. In: International Meeting of the Workgroup on Cavitation and Dynamic Problems in Hydraulic Machinery and Systems; Timisoara, Romania; 2007.
[3] Platero CA, Sánchez JA, Nicolet C, Allenbach P. Hydropower plants frequency regulation depending on upper reservoir water level. Energies 2019; 12 (9): 1637. doi: 10.3390/en12091637
[4] Altay A, Şahin C, İskender İ, Gezer D, Çakır CA. Compensator design for the aged hydro electric power plant speed governors. Electric Power Systems Research 2016; 133: 257–268. doi:10.1016/j.epsr.2015.12.016
[5] Zeng Y, Zhang L, Guo Y, Qian J, Zhang C. The generalized hamiltonian model for the shafting transient analysis of the hydro turbine generating sets. Nonlinear Dynamics 2014; 76 (4): 1921–1933. doi:10.1007/s11071-014-1257-9
[6] Gustavsson R. Modelling and analysis of hydropower generator rotors. Licentiate dissertation, Luleå University of Technology,Luleå, Switzerland; 2005.
[7] Dollon Q, Monette C, Gagnon M, Tahan A, Antoni J. Calibration of critical speed predictions using experimental measurements. In: IOP Conference Series: Earth Environmental Science; Lausanne, Switzerland; 2021. doi: 10.1088/1755-1315/774/1/012130
[8] Mohanta RK, Chelliah TR, Allamsetty S, Akula A, Ghosh R. Sources of vibration and their treatment in hydro power stations - a review. Engineering Science and Technology, an International Journal 2017; 20 (2): 637–648. doi:10.1016/j.jestch.2016.11.004
[9] Liu D, Ding SC, Wang Z, Yu LJ. Transient response and critical speed analysis of large vertical volute pump. In: IOP Conference Series: Earth Environmental Science; Beijing, China; 2018. doi: 10.1088/1755-1315/163/1/012048
[10] Bai B, Zhang L, Guo T, Liu C. Analysis of dynamic characteristics of the main shaft system in a hydro-turbine based on ANSYS. In: International Conference on Advances in Computational Modeling and Simulation; Kunming, China; 2012. pp. 654-658. doi: 10.1016/j.proeng.2012.01.1081
[11] Bettig BP, Han RPS. Modeling the lateral vibration of hydraulic turbine-generator rotors. Journal of Vibration and Acoustics 1999; 121 (3): 322–327. doi:10.1115/1.2893983
[12] Zou CP, Hua HX, Chen DS. Modal synthesis method of lateral vibration analysis for rotor-bearing system. Computers & Structures 2002; 80 (32): 2537–2549. doi:10.1016/S0045-7949(02)00294-8
[13] Husnjak O, Oreskovic O, Letal J, Kaica F. Identification of hydro unit stiffness, critical speed and vibrating masses based on vibration measurements. Spokane, WA, USA: HydroVision, 2018.
[14] Xu Y, Li Z, Lai X. Dynamic model for hydro-turbine generator units based on a database method for guide bearings. Shock and Vibration 2013; 20: 411–421. doi:10.1155/2013/426849
[15] Feng F, Chu F. Dynamic analysis of a hydraulic turbine unit. Mechanics Based Design of Structures and Machines 2001; 29: 505–531. doi:10.1081/SME-100107625
[16] Xu Y, Li Z, Lai X. Simulation model of radial vibration for a large hydro-turbine generator unit and its application. In: IEEE Power Engineering and Automation Conference; Wuhan, China; 2011. pp 191–195. doi:10.1109/PEAM.2011.6135043
[17] Lai X, Liao G, Zhu Y, Zhang X, Gou Q et al. Lateral vibration of hydro turbine-generator rotor with varying stiffness of guide bearings. IOP Conference Series: Earth and Environmental Science 2012; 15 (2): 1-13. doi:10.1088/1755- 1315/15/4/042006
[18] Bucur DM, Cosoiu CI, Iovanel RG, Nicolae AA, Georgescu SC. Assessing the operation of the cooling water system of a hydro-power plant using EPANET. Energy Procedia 2017; 112: 51–57. doi:10.1016/j.egypro.2017.03.1058
[19] Subbiah R, Kumar AS, Sankar TS. Transient dynamic analysis of rotors using the combined methodologies of finite elements and transfer matrix. Journal of Applied Mechanics 1988; 55 (2): 448–452. doi:10.1115/1.3173697
[20] Bai B, Zhang LX, Zhao L. Influences of the guide bearing stiffness on the critical speed of rotation in the main shaft system. In: IOP Conf. Ser.: Earth Environ. Sci. 2012; 15: 1-6. doi: 10.1088/1755-1315/15/7/072028
[21] Jagannath K. Evaluation of critical speed of generator rotor with external load. International Journal of Engineering Research and Development 2012; 11 (1): 11-16.