Effect of Damper Modelling and the Fault Clearing Process on Response Torque and Stressing of Turbine-Generator Shafts

Hammons, T.J.; Canay, I. M.

doi:10.1109/tec.1986.4765676

Cited by 39 publications

(3 citation statements)

References 4 publications

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“…Therefore, the DC offset currents resulting from the stator transients of synchronous machines can not be obtained by the traditional method. It has been reported that abnormal oscillating torques are developed in generator shafts due mainly to the DC offset currents during unsymmetrical as well as symmetrical faults [6], [7]. Thls problem is very important from the point of view of design.…”

Section: Introductionmentioning

confidence: 99%

A new method to approximate stator transients of synchronous machines in power system simulation

Tamura

Takeda

Kojima

et al. 1997

IEEE Trans. On energy Conversion

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Section: Introductionmentioning

confidence: 99%

A new method to approximate stator transients of synchronous machines in power system simulation

Tamura

Takeda

Kojima

et al. 1997

IEEE Trans. On energy Conversion

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“…Effect damper modelling has on damping shaft torsional vibrations is discussed in Reference [3] . Continuum and reduced shaft models employed in evaluating damping of torsional vibrations is analysed in Reference [4].…”

Section: The Logarithmic Decrement In Terms Of the Time Constantmentioning

confidence: 99%

Mechanical countermeasures to subsynchronous torsional instability (in turbogenerators)

Hannett

Mello

1990

IEEE Trans. Power Syst.

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Countermeasures for the subsynchronous resonance problem have been electrical in nature such as series filters, relays, supplementary signals through the excitation system and dynamic filters. A mechanical countermeasure is presented in this paper using a fluid coupling with a flywheel. This paper presents the effect of varying the flywheel inertia and the fluid coupling's characteristics on the mechanical damping. Fluid CouolinqThe fluid coupling is a centrifugal pump and a turbine built together into a single housing. There is no solid connection between the turbine and pump, but rather a liquid, usually oil, is the means to transmit torque from the pump to the turbine. The torque transmission depends on the speed difference between the pump and turbine.For modeling purposes the fluid coupling is considered as a damper between two masses as shown in Figure 1. AS shown in Figure 1 the torque is transmitted from the driving shaft to the driven shaft. Input power is equal to T x w l and output power is equal to Txw2, making the efficiency to be KEYWORDS Subsynchronous resonance, fluid coupling, mechanical coupl ing

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“…The phenomena vibrates the turbine-generator shaft, resulting in torsional shaft stress [1][2][3][4][5][6]. Numerous factors such as circuit-breaker switching can cause turbine-generator shaft torsional stress, and an accumulation of critical stress can result in the cracking of the shaft [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Development of a Leader-End Reclosing Algorithm Considering Turbine-Generator Shaft Torque

et al. 2017

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High-speed auto-reclosing is used in power system protection schemes to ensure the stability and reliability of the transmission system; leader-follower auto-reclosing is one scheme type that is widely used. However, when a leader-follower reclosing scheme responds to a permanent fault that affects a transmission line in the proximity of a generation plant, the reclosing directly impacts the turbine-generator shaft; furthermore, the nature of this impact is dependent upon the selection of the leader reclosing terminal. We therefore analyzed the transient torque of the turbine-generator shaft according to the selection of the leader-follower reclosing end between both ends of the transmission line. We used this analysis to propose an adaptive leader-end reclosing algorithm that removes the stress potential of the transient torque to prevent it from damaging the turbine-generator shaft. We conducted a simulation in actual Korean power systems based on the ElectroMagnetic Transients Program (EMTP) and the Dynamic Link Library (DLL) function in EMTP-RV (Restructured Version) to realize the proposed algorithm.

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Effect of Damper Modelling and the Fault Clearing Process on Response Torque and Stressing of Turbine-Generator Shafts

Cited by 39 publications

References 4 publications

A new method to approximate stator transients of synchronous machines in power system simulation

A new method to approximate stator transients of synchronous machines in power system simulation

Mechanical countermeasures to subsynchronous torsional instability (in turbogenerators)

Development of a Leader-End Reclosing Algorithm Considering Turbine-Generator Shaft Torque

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