Online Evaluation of Turbo-Generator Shaft Fatigue Damage Caused by Subsynchronous Oscillation

Chen, Dongchao; Zhang, Yuhao; Gu, Yujiong

doi:10.1109/access.2020.2981509

Cited by 9 publications

(6 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Chen and al. [9] obtained the electromagnetic torque from the measured current and voltage, applied this to the spring-mass model of the shaft assembly then used real-time simulation to determine shaft torque. The shaft torsional angle was then coupled back to the electromagnetic torque.…”

Section: Related Workmentioning

confidence: 99%

“…An OMPS is normally designed to operate as a backup to torsional vibrations mitigation to shut down the turbine generator when the accumulated fatigue life loss reaches a dangerous level. The ability of OMPSs to protect the shafts against cumulative fatigue damage due to moderate transient torques was established in the work of [8][9][10], but their ability to protect the shafts against abrupt fatigue damage due to huge torque impulses has never been established. Indeed, a huge torque impulse may cause shaft damage in less than a full cycle of the torque waveform, almost instantly, before even the OMPS can estimate the fatigue life loss incurred by the shaft since OMPSs evaluate shaft fatigue life loss based on complete cycles of the torque waveform, according to the rain-flow cycle counting technique [8].…”

Section: Introductionmentioning

confidence: 99%

“…Computer simulation is used in the study because practical estimation of turbine generator shaft fatigue life loss is always based on computer simulation [9,10]. The process requires first obtaining the shaft torque waveform.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Predicted-Risk-Based Protection Approach for Turbine Generator Shafts against Fatigue Damage due to Islanding

Babi

Bokoro

2022

Energies

View full text Add to dashboard Cite

A distributed generation steam turbine generator (hereafter referred to as turbine generator) improves the supply reliability of the local load when operated as a backup supply during islanding. Interconnection standards recommend removing the utility load from the island. Transient torques induced at the moments of islanding and removing the utility load from the island may cause shaft fatigue life loss and lead to fatigue damage. Therefore, a protection method is proposed in this work. The method is based on predicting the risk of shaft fatigue damage. Induced transient torque is first modeled. Fatigue study determines the local load size required to mitigate shaft torsional vibrations and avoid fatigue life loss during islanding. This is substituted in the torque function to obtain the critical torque. The risk of shaft fatigue damage is predicted by comparing the actual shaft torque with the critical torque. The turbine generator is shut down when the actual shaft torque during islanding exceeds the critical torque. Islanding on the local load is allowed when the actual shaft torque is smaller than the critical torque. The proposed method yields 0.011% shaft fatigue life loss under the most adverse islanding condition against 100% obtained with an online monitoring and protection system (OMPS).

show abstract

Section: Related Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Predicted-Risk-Based Protection Approach for Turbine Generator Shafts against Fatigue Damage due to Islanding

Babi

Bokoro

2022

Energies

View full text Add to dashboard Cite

show abstract

“…However, more research has been carried out on the rationality of turbine power generation systems [8], [9], [10], and less on the structure of the generator body. In reality, nevertheless, the harsh operating environment of the turbocharger places high demands on the generator.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Topology and Electromagnetic Characteristics of Novel Stator Partitioned Axial Flux Disk Generator for Vehicles

Shi

Liu

et al. 2023

IEEE Access

View full text Add to dashboard Cite

Internal combustion engines emit high-temperature, high-pressure, and high-speed exhaust gases, resulting in wasted energy and low thermal efficiency. In order to recover the available residual energy in the exhaust gas, this paper proposes a new topology of the disk-type axial flux stator-excited doubly salient generator (AFSDSG) with partitioned stator suitable for high-temperature and high-speed operation. Based on the analysis of the above generator inductance characteristics, the influence mechanism of three pole-slot structures on the induced electromotive force (IEMF) of the armature winding is clarified, the equivalent magnetic circuit method is used to analyze the influence of different winding arrangements on the no-load performance of the generator, and the principles of pole-slot structure optimization and winding arrangement are summarized. The finite element software is used to model and simulate different configuration. After focusing on the analysis of transient characteristics such as inductance, armature winding IEMF, and air-gap flux, it is concluded that different from the conventional pole-slot structure and winding connection method make that only the overlapping area of the stator and the rotor changes linearly can produce a constant voltage, the winding arrangement of Winding Partition Excitation Span 2 has a high IEMF amplitude value and low harmonic content. Finally, the prototype of a three-phase 12/8-pole was trial manufactured and tested. The consistency of the simulation results and experimental results is verified the innovation and feasibility of the new topology proposed in this paper.

show abstract

“…In this case, material property analysis, analytical stress calculation, and stress concentration analysis allowed the authors to conclude that high stress concentration and scratches produced by rubbing with an annular ring were the main causes of failure. Several researchers have studied shaft torque, even under transient conditions generated during transient electrical phenomena, and have evaluated its effect on shaft fatigue [3][4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Structural component fatigue analysis of a hydrogenerator rotor

Casanova

Gutierrez²,

Viveros³

2020

DYNA

View full text Add to dashboard Cite

This paper presents a fatigue life calculation for the pole, the rotor rim, and the rotor spoke of a 100 MW hydro-generator. Mechanical and electrical parameters during unit start, with the hydro-generator working at several power levels, and during a load rejection from 100 MW were measured. The measured loads together with centrifugal force, gravity, and magnetic pulling force were included in finite element models to quantify stresses. Also, stresses produced during over-speed, phase-to-ground failure, and phase-to-phase failure were evaluated. A stress history for each element was obtained by fitting the calculated stresses, with the power generation history collected hourly during one year of operation of the machine. Fatigue life calculation was performed by using the stress history along with the Wang-Brown multiaxial fatigue model.

show abstract

Online Evaluation of Turbo-Generator Shaft Fatigue Damage Caused by Subsynchronous Oscillation

Cited by 9 publications

References 32 publications

A Predicted-Risk-Based Protection Approach for Turbine Generator Shafts against Fatigue Damage due to Islanding

A Predicted-Risk-Based Protection Approach for Turbine Generator Shafts against Fatigue Damage due to Islanding

Analysis of the Topology and Electromagnetic Characteristics of Novel Stator Partitioned Axial Flux Disk Generator for Vehicles

Structural component fatigue analysis of a hydrogenerator rotor

Contact Info

Product

Resources

About