Effects of Frequency and Voltage Relays on Turbine-Generator Shaft Fatigue due to Islanding

Babi, Bombay; Bokoro, Pitshou N.

doi:10.1109/saupec/robmech/prasa52254.2021.9377213

Cited by 1 publication

(2 citation statements)

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“…Section 3.1 describes the network model. The methodology to estimate shaft fatigue life loss is set out in the work of [24]. Section 3.2 presents the methodology to model shaft transient torque during islanding, while Section 3.3 describes the simulation process.…”

Section: Methodsmentioning

confidence: 99%

“…It was shown in the work of [24] that shaft fatigue life loss during islanding is avoided when the size of the local load is at least 5% of the generator output power when ∆P 1 > 0, or at least 10% when ∆P 1 < 0. The size of the local load required to avoid shaft fatigue life loss during islanding was called the critical load value and the corresponding torque, the critical torque.…”

Section: Proposed Protection Methodsmentioning

confidence: 99%

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

Babi

Bokoro

2022

Energies

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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).

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Section: Methodsmentioning

confidence: 99%

Section: Proposed Protection Methodsmentioning

confidence: 99%