A Novel Reclosing Algorithm Considering Turbine-Generator Shaft Torque

Park, Ji-Kyung; Kim, Chul‐Hwan; Sohn, Seung-Hyun; Chung, Soo Young

doi:10.1109/tpwrd.2016.2569607

Cited by 16 publications

(8 citation statements)

References 23 publications

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“…where X is the system state variables of the incremental form, and A is the state matrix of the system. The corresponding eigenvalue equation of the system is [8] |λI − A| = 0…”

Section: Eigenvalue Analysismentioning

confidence: 99%

“…The main function of the speed governing system of a modern large turbogenerator is to adjust the speed and load of the system. The state characteristic equations of the speed governing system at an operating point are established as follows [8].…”

Section: Turbine Speed Governing Systemmentioning

confidence: 99%

“…There are many methods to study SSR in the power system. Amongst these, the eigenvalue analysis, electromagnetic transient analysis, complex torque coefficient analysis, and frequency scanning are the most used methods [8][9][10][11]. A summary of several major analysis methods is shown in Table 1.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Subsynchronous Resonance Characteristics and Influence Factors in a Series Compensated Transmission System

Dakang²,

Song

et al. 2019

Energies

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Series capacitor compensation is used to improve the utilization of existing power systems. Subsynchronous resonance (SSR) can be caused by series compensated lines, which would lead to turbogenerator shaft breakdown. A novel approach was presented in this paper to analyze the characteristics and influence factors of SSR in a series compensated transmission system. The system model of SSR, including the various modules of the electromechanical network, was established, and the eigenvalue results under 70% series compensation level were analyzed by eigenvalue analysis method for the the institute of electrical and electronics engineers (IEEE) first benchmark model (FBM). Compared with the results of the power systems computer-aided design (PSCAD) modeling and simulation, the effectiveness of eigenvalue analysis method was proven. After that, the eigenvalue analysis method was used to study, in detail, the effects of system series compensation levels, synchronous generator parameters, speed governing system parameters, and excitation system parameters on SSR characteristics. The research results show that the series compensation level has the greatest influence on the torsional mode damping of the system. The parameters of generator reactance, speed governing system, and excitation system have some effect on the torsional mode damping. The parameters of excitation system significantly affect the low-frequency oscillation damping.

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“…where X is the system state variables of the incremental form, and A is the state matrix of the system. The corresponding eigenvalue equation of the system is [8] |λI − A| = 0…”

Section: Eigenvalue Analysismentioning

confidence: 99%

Section: Turbine Speed Governing Systemmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of Subsynchronous Resonance Characteristics and Influence Factors in a Series Compensated Transmission System

Dakang²,

Song

et al. 2019

Energies

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“…By far, the EMT ripple properties in normal condition have been well studied by scholars [4,5]. Since the magnetic flux density (MFD), which is closely related to EMT, will be changed due to different faults, the EMT ripple characteristics will be also varied in different fault cases.…”

Section: Introductionmentioning

confidence: 99%

Impact of Single and Combined Faults Composed of Rotor Eccentricity and Stator Interturn Short Circuit on Electromagnetic Torque Ripples in Synchronous Generator

Zhang

Wang

et al. 2020

Complexity

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In order to comprehensively study and identify the electromagnetic torque (EMT) difference among the single static air-gap eccentricity (SAGE) fault, the single stator interturn short circuit fault (SISC), and the combined fault composed of these two, this article investigates the EMT ripple properties due to the mentioned three faults. Different from other studies, this paper considers not only the effect of the single fault types but also the impact of the single fault combinations on the EMT ripple characteristics. Detailed EMT expressions for each fault are firstly derived on the basis of the magnetic flux density (MFD) analysis. Then, finite element calculation and experimental study on a CS-5 prototype generator with two poles at 3000 rpm, which is specifically designed and manufactured ourselves, are carried out to validate the analysis result. It is found that the three faults will induce different ripple components in EMT. The combined faults have the most intensive impact sensitivity on the EMT ripples, while the single SAGE fault ranks the last in the impact effect.

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“…Nevertheless, the single‐phase reclosing scheme applied to a WPO line is simply adopted from the scheme used in conventional power transmission lines, which merely recloses the faulty phase after a fixed time (ie, dead time) without distinguishing between transient and permanent faults. Such “blind” reclosing may cause the wind farms and the relative power systems to reclose to a fault for another time, and stability and reliability of both connected wind farms and power systems will be seriously affected . Consequently, it is of great importance to propose adaptive single‐phase auto‐reclosing (ASPAR) schemes that can identify transient faults from the permanent ones and reclose a WPO line only after guaranteeing extinction of a transient fault.…”

Section: Introductionmentioning

confidence: 99%

Faulty phase active power characteristics‐based adaptive single‐phase reclosing schemes for shunt reactors‐compensated wind power outgoing line

Chao

Fan³

et al. 2019

Wind Energy

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This paper proposes two novel adaptive single‐phase auto‐reclosing (ASPAR) schemes for shunt reactors‐compensated wind power outgoing (WPO) line. After extinction of a fault on a single phase‐tripped WPO line, due to the existence of shunt reactors and distributed capacitors, a free frequency component will emerge in the tripped faulty phase, which will make faulty phase active power calculated with instantaneous power algorithm have a bigger magnitude and more frequency components. According to these characteristics, transient fault identification (TFI) methods based on active power root mean square (RMS) value and twisty beat frequency were put forward. Subsequently, in view of abovementioned TFI methods, ASPAR schemes for a shunt reactors‐compensated WPO line based on faulty phase active power characteristics were established. Simulation experiments, which were conducted using the software PSCAD/EMTDC, verified that the proposed ASPAR schemes can distinguish transient faults from permanent ones rapidly and reliably. The experiments also proved that the proposed adaptive single‐phase reclosing schemes can minimize the influence of changes in fault location and transition resistance and, thus, are suitable for the inconsistent output power of a wind farm and the complex working condition of an outgoing line.

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A Novel Reclosing Algorithm Considering Turbine-Generator Shaft Torque

Cited by 16 publications

References 23 publications

Analysis of Subsynchronous Resonance Characteristics and Influence Factors in a Series Compensated Transmission System

Analysis of Subsynchronous Resonance Characteristics and Influence Factors in a Series Compensated Transmission System

Impact of Single and Combined Faults Composed of Rotor Eccentricity and Stator Interturn Short Circuit on Electromagnetic Torque Ripples in Synchronous Generator

Faulty phase active power characteristics‐based adaptive single‐phase reclosing schemes for shunt reactors‐compensated wind power outgoing line

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