A new single-pole switching technique for suppressing turbine-generator torsional vibrations and enhancing power stability and continuity

Tsai, Jong-Ian

doi:10.1049/iet-gtd:20060534

Cited by 8 publications

(7 citation statements)

References 8 publications

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“…Unlike the step-1, the step-2 focuses on the impact when a reclosing operation occurs. It has been researched that the impact on the turbine generator can be evaluated by a sudden power change, ΔP, generated by a switching operation [19][20][21][22][23]. An IEEE Committee recommends that a ΔP value equal to 0.5 per unit be considered an acceptable screening level for evaluating steady-state switching if a turbine generator is operating under the allowable load condition [14][15].…”

Section: Step-2mentioning

confidence: 99%

A Novel Method for Deriving Optimal Synchronism-Check Phase Angle in Transmission System

Oh¹,

Gwon²,

Kim³

et al. 2016

Journal of Electrical Engineering and Technology

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-Most of faults occurring in transmission system are transient. To cope with such faults, automatic reclosing is applied and it is economic and effective method to improve the reliability and transient stability of power system. Many countries applying 3-phase and leader-follower reclosing scheme use a synchronism-check relay to limit impacts associated with automatic reclosing under Live-Bus/Live-Line (LBLL) conditions. Most utilities generally use a standardized conservative setting that is in the range of 20 o to 30 o . However, it might be sometimes not a good idea because each transmission line in system has different system conditions such as system structure, line length and load flow that might result in undesirable system impacts. Therefore, it is necessary to derive the Optimal Synchronism-Check (OSC) phase angle which is appropriate for each transmission system. In this paper, a novel method composed of three steps is proposed to derive the OSC phase angle. The proposed method is applied to transmission system based on actual data from Korea. Computer simulations are performed using ElectroMagnetic Transient Program (EMTP) and simulation results show that proposed method is valid and effective.

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Section: Step-2mentioning

confidence: 99%

A Novel Method for Deriving Optimal Synchronism-Check Phase Angle in Transmission System

Oh¹,

Gwon²,

Kim³

et al. 2016

Journal of Electrical Engineering and Technology

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show abstract

“…The advantages of single-pole switching technique on respective line has been well known in numerous research works [1][2], resulting from the frequent single-line to ground fault. A great benefit on enhancing transient stability is gained due to less real power fluctuation through only one pole switching.…”

Section: Introductionmentioning

confidence: 99%

“…However, the persistently negative-sequence currents would inject to nearby turbine generators during the dead time between single-pole clearing and line reclosing. One increasing concern is the induced electromagnetic disturbing torque (E/M torque) with double system frequency (120Hz) component, which could excite SPSR effect and damaging torques on LP final row (L0) or next-to-final (L1) row turbinegenerator blades [2,4]. To solve such a problem is the motivation behind the development of our proposed method.…”

Section: Introductionmentioning

confidence: 99%

“…To solve such a problem is the motivation behind the development of our proposed method. So far we have discussed a grounding capacitor schemes [2], equipped at the neutral of step-up transformer. Faried proposed an TCSC bank approach to be a solution [3].…”

Section: Introductionmentioning

confidence: 99%

“…Among them, the flexural mode has lower resonant frequency and is usually chosen to investigate the vibration mode shapes of blades for the super-synchronous resonance investigation. The simulation electrical and mechanical data can be obtained from [2]. …”

Section: Introductionmentioning

confidence: 99%

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Restricting Turbine Blade Vibrations by a Series Compensation Capacitor

Tsai

Tsao

2009

2009 Fourth International Conference on Innovative Computing, Information and Control (ICICIC)

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This paper presents a modified single-pole switching scheme to depress turbine-generator blade torsional torques. During the dead time between single-pole tripping and line reclosing, the two healthy phases still maintain partial power transmission, which gives rise to significantly negative sequence current flowing into the nearby turbine-generato and may lead to supersynchronous resonance (SPSR) effect on low pressure (LP) turbine blades and even result in fatigue damage. The modified series compensation capacitor is inserted to balance the system and then limits this negative sequence current. Then the induced adverse effect on turbine blades is no longer a problem.

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Torsional Vibrations Control of Double‐Ended Driving and Dual‐Excited Turbo‐Generator Shafts Based on Multi‐Index Nonlinear Control

Qin

et al. 2021

IEEJ Transactions Elec Engng

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Non-member Yejie Tian, Non-member The problem of shafting torsional vibrations has been increasingly emerging due to the increasing capacity of turbo-generator and the complexity of power grid. Therefore, how to reduce the torsional vibration of the turbo-generator shaft and improve the stability of the power system has become the focus of our research. First, in order to solve the problem and alleviate the torsional vibrations of turbo-generator shafts, this paper proposed a new shafting structure model of Double-ended Driving and Dual-Excited Turbo-Generator set (DDDETG). A static excitation mode is used for the excitation of the DDDETG and the mechanical power is supplied symmetrically and synchronously from both ends of the generator rotor. Then, in order to improve the output characteristic of the generator and further suppress the torsional vibrations of the turbo-generator shafts, combined with the nonlinear control design method of partial feedback linearization, a Multi-Index Nonlinear Coordinated Control (MINCC) strategy for the double-ended driving and dual-excited turbo-generator is proposed to ensure good dynamic and static state performances of each state in the system. Finally, the simulation results on a single-machine infinite bus system demonstrate the effectiveness of the proposed control strategy. In addition, this paper compares the performance of DDDETG and the traditional Single-ended Drive and Single-Excited Turbo Generator (SDSETG), the simulation results show that the restraint effect of the DDDETG structure on shafting torsional vibrations is more obvious under the proposed control strategy.

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A new single-pole switching technique for suppressing turbine-generator torsional vibrations and enhancing power stability and continuity

Cited by 8 publications

References 8 publications

A Novel Method for Deriving Optimal Synchronism-Check Phase Angle in Transmission System

A Novel Method for Deriving Optimal Synchronism-Check Phase Angle in Transmission System

Restricting Turbine Blade Vibrations by a Series Compensation Capacitor

Torsional Vibrations Control of Double‐Ended Driving and Dual‐Excited Turbo‐Generator Shafts Based on Multi‐Index Nonlinear Control

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