Research Papers: Gas Turbines: Structures and Dynamics

Coupled Torsional Vibration and Fatigue Damage of Turbine Generator Due to Grid Disturbance

[+] Author and Article Information
Chao Liu

State Key Laboratory of Control and Simulation
of Power System and Generation Equipments,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: chaoliu13@tsinghua.edu.cn

Dongxiang Jiang

State Key Laboratory of Control and Simulation
of Power System and Generation Equipments,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: jiangdx@tsinghua.edu.cn

Jingming Chen

State Key Laboratory of Control and Simulation
of Power System and Generation Equipments,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China

1Corresponding author.

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received November 18, 2013; final manuscript received December 7, 2013; published online January 9, 2014. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(6), 062501 (Jan 09, 2014) (9 pages) Paper No: GTP-13-1420; doi: 10.1115/1.4026214 History: Received November 18, 2013; Revised December 07, 2013

Crack failures continually occur in shafts of turbine generator, where grid disturbance is an important cause. To estimate influences of grid disturbance, coupled torsional vibration and fatigue damage of turbine generator shafts are analyzed in this work, with a case study in a 600MW steam unit in China. The analysis is the following: (i) coupled system is established with generator model and finite element method (FEM)-based shafts model, where the grid disturbance is signified by fluctuation of generator outputs and the shafts model is formed with lumped mass model (LMM) and continuous mass model (CMM), respectively; (ii) fatigue damage is evaluated in the weak location of the shafts through local torque response computation, stress calculation, and fatigue accumulation; and (iii) failure-prevention approach is formed by solving the inverse problem in fatigue evaluation. The results indicate that the proposed scheme with continuous mass model can acquire more detailed and accurate local responses throughout the shafts compared with the scheme without coupled effects or the scheme using lumped mass model. Using the coupled torsional vibration scheme, fatigue damage caused by grid disturbance is evaluated and failure prevention rule is formed.

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Jiang, D., Hong, L., Wang, Z., and Xie, X., 2009, “Torsional Vibration Analysis and Stress Calculation for the Fault 600MW Steam Turbine Generator Shaft System,” ASME Paper No. DETC2009-86854. [CrossRef]
Dorfman, L. S., and Trubelja, M., 1999, “Torsional Monitoring of Turbine-Generators for Incipient Failure Detection,” Sixth EPRI Steam Turbine Generator Workshop, St. Louis, MO, August 17–20.
Lebold, M. S., Maynard, K. P., Trethewey, M. W., Bieryla, D. J., Lissenden, C. J., Tissot, S. P., Verrier, P., and Metz, J., 2003, “Technology Development for Shaft Crack Detection in Rotating Equipment,” EPRI International Maintenance Conference, Chicago, IL, August 18–20.
Szász, G., and Guindon, E. J., 2003, “Using Torsional Vibration Spectra to Monitor Machinery Rotor Integrity,” ASME Paper No. IJPGC2003-40162. [CrossRef]
Stein, J., 2002, “Retaining Ring Cracking at Wisconsin Electric Power Company's Port Washington Unit 1—Root Cause Analysis Report,” Electric Power Research Institute, Palo Alto, CA, and Wisconsin Electric Power Company, Milwaukee, WI, EPRI Tech. Rep. No. 1007001.
Rosario, D. A., and Khalid, T., 2005, “Generator Shaft Keyway Cracking Failure Investigation,” 9th EPRI Steam Turbine/Generator Workshop, Denver, CO, August 22–24.
Walker, D., Bowler, C., Jackson, R., and Hodges, D., 1975, “Results of Subsynchronous Resonance Test at Mohave,” IEEE Trans. Power Appar. Syst., 94(5), pp. 1878–1889. [CrossRef]
Ishida, Y., 2008, “Cracked Rotors: Industrial Machine Case Histories and Nonlinear Effects Shown by Simple Jeffcott Rotor,” Mech. Syst. Signal Process., 22(4), pp. 805–817. [CrossRef]
Pennacchi, P., and Vania, A., 2008, “Diagnostics of a Crack in a Load Coupling of a Gas Turbine Using the Machine Model and the Analysis of the Shaft Vibrations,” Mech. Syst. Signal Process., 22(5), pp. 1157–1178. [CrossRef]
Bachschmid, N., Pennacchi, P., and Tanzi, E., 2010, Cracked Rotors: A Survey on Static and Dynamic Behaviour Including Modelling and Diagnosis, Springer, New York.
IEEE Subsynchronous Resonance Working Group of the System Dynamic Performance Subcomittee, 1985, “Terms, Definitions and Symbols for Subsynchronous Oscillations,” IEEE Trans. Power Appar. Syst., 104(6), pp. 1326–1334. [CrossRef]
Kalcon, G., Adam, G., Anaya-Lara, O., Lo, S., and Uhlen, K., 2012, “Small-Signal Stability Analysis of Multi-Terminal VSC-Based DC Transmission Systems,” IEEE Trans. Power Syst., 27(4), pp. 1818–1830. [CrossRef]
Xie, X., Liu, P., Bai, K., and Han, Y., 2013, “Applying Improved Blocking Filters to the SSR Problem of the Tuoketuo Power System,” IEEE Trans. Power Deliv., 28(1), pp. 227–235. [CrossRef]
Xie, X., Guo, X., and Han, Y., 2011, “Mitigation of Multimodal SSR Using SEDC in the Shangdu Series-Compensated Power System,” IEEE Trans. Power Syst., 26(1), pp. 384–391. [CrossRef]
Maljkovic, Z., Stegic, M., and Kuterovac, L., 2010, “Torsional Oscillations of the Turbine-Generator Due to Network Faults,” 14th IEEE International Conference on Power Electronics and Motion Control (EPE/PEMC), Ohrid, Macedonia, September 6–8, pp. 82–85 [CrossRef].
Tsai, J., Lin, C., and Tsao, T., 2004, “Assessment of Long-Term Life Expenditure for Steam Turbine Shafts Due to Noncharacteristic Subharmonic Currents in Asynchronous Links,” IEEE Trans. Power Syst., 19(1), pp. 507–516. [CrossRef]
Bhartiya, Y., and Sinha, A., 2013, “Reduced Order Modeling of a Bladed Rotor With Geometric Mistuning Via Estimated Deviations in Mass and Stiffness Matrices,” ASME J. Eng. Gas Turbines Power, 135(5), p. 052501. [CrossRef]
Yang, B., and Chen, H., 1993, “Reduced-Order Shaft System Models of Turbogenerators,” IEEE Trans. Power Syst., 8(3), pp. 1366–1374. [CrossRef]
IEEE Committee Report, 1991, “Third Supplement to a Bibliography for the Study of Subsynchronous Resonance Between Rotating Machines and Power Systems,” IEEE Trans. Power Syst., 6(2), pp. 830–833. [CrossRef]
Ni, Y., Chen, S., and Zhang, B., 2001, Theory and Analysis in Dynamic Power System, Tsinghua University, Beijing.
Wang, X. F., 2003, Analysis of Modern Electric Power System, Science, Beijing.
Grande-Moran, C., and Brown, M., 1997, “Coherency-Based Low Order Models for Shaft Systems of Turbine-Generator Sets,” IEEE Trans. Energy Convers., 12(3), pp. 217–224. [CrossRef]
Ricci, R., Pennacchi, P., Pesatori, E., and Turozzi, G., 2010, “Modeling and Model Updating of Torsional Behavior of an Industrial Steam Turbo Generator,” ASME J. Eng. Gas Turbines Power, 132(7), p. 074501. [CrossRef]
Wang, X. C., 2003, Finite Element Method, Tsinghua University, Beijing.
Ansys, 2009, ANSYS Release 12.1 Documentation, Ansys, Inc., Pittsburgh, PA.
Endo, T., Mitsunaga, K., and Nakagawa, H., 1967, “Fatigue of Metals Subjected to Varying Stress—Prediction of Fatigue Lives,” Preliminary Proceedings of the Chugoku-Shikoku District Meeting, Japanese Society of Mechanical Engineers, Tokyo, pp. 41–44.
Rychlik, I., 1987, “A New Definition of the Rainflow Cycle Counting Method,” Int. J. Fatigue, 9(2), pp. 119–121. [CrossRef]
Chan, K. S., Enright, M. P., Golden, P. J., Naboulsi, S., Chandra, R., and Pentz, A. C., 2012, “Probabilistic High-Cycle Fretting Fatigue Assessment of Gas Turbine Engine Components,” ASME J. Eng. Gas Turbines Power, 134(6), p. 062502. [CrossRef]


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Fig. 3

The monitored current signals at the spot of SSO conditions: (a) current ia; (b) spectrum analysis

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Fig. 4

The model of ideal generator

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Fig. 5

Profile of steam-turbine generator shafts

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Fig. 2

Torsional vibration measured in operation

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Fig. 1

Crack failure occurred in a power plant: (a) cracked assembly; (b) cracked coupling

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Fig. 6

Flow chart of fatigue evaluation and failure prevention

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Fig. 7

Finite element model of the weak location

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Fig. 8

Nonlinear material property of the assembled coupling section

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Fig. 9

Strain-cycles curve of 30Cr11Ni2W2MoV

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Fig. 10

Electromagnetic torque of the coupled system with lumped mass model and continuous mass model: (a) electromagnetic torque; (b) spectrum analysis of electromagnetic torque with LMM; and (c) spectrum analysis of electromagnetic torque with CMM

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Fig. 11

Electromagnetic torque without coupled effects: (a) electromagnetic torque; (b) spectrum analysis

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Fig. 12

Coupled vibration responses in different locations of shafts with lumped mass model

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Fig. 13

Coupled vibration responses in different locations of shafts with continuous mass model

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Fig. 14

Fatigue damage in different cases of torsional vibration




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