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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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Figures

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Fig. 1

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

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Fig. 2

Torsional vibration measured in operation

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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. 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. 14

Fatigue damage in different cases of torsional vibration

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Fig. 13

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

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