Subsynchronous resonance studies and mitigation methods for series capacitor applications

Baker, Dennis J.; Boukarim, G.E.; D’Aquila, R.; Piwko, R.J.

doi:10.1109/pesafr.2005.1611851

Cited by 44 publications

(26 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The change in electrical torque is not zero, and it was shown by equation (12). The state-space form can be expressed in matrix form, as in equation (19), where A is the plant matrix and A = f(H, D, K, K s ).…”

Section: T-g Shaft Systemmentioning

confidence: 99%

Impact of Torsional Resonance in Turbine-Generator Shaft Due to Multiple EAF Operation

Islam¹,

Chowdhury²

2017

IOSR JEEE

View full text Add to dashboard Cite

Among the many nonlinear loads, electric arc furnace (EAF) is a potential source of sub-harmonic currents. Again, turbine-generator (T-G) shaft possesses natural frequencies in the sub-synchronous/subharmonic range. If those sub-harmonic frequencies match to natural frequencies there occur amplification of torsional oscillating torques transmitted among the masses of T-G shaft. This may lead to damage rotating shaft, especially T-G shaft, in the system. This paper assesses the severity of amplified oscillating torques on T-G shaft due to multiple EAFs connected to same point of common coupling (PCC). This paper also assesses the impact due to relative location of EAFs from power stations. For this purpose, a lumped-mass model of T-G shaft and mathematical model of electric arc have been considered. EAFs have been connected to the same PCC and their effects on T-G shaft have been measured with/without resonant excitation of torsional modes.

show abstract

Section: T-g Shaft Systemmentioning

confidence: 99%

Impact of Torsional Resonance in Turbine-Generator Shaft Due to Multiple EAF Operation

Islam¹,

Chowdhury²

2017

IOSR JEEE

View full text Add to dashboard Cite

show abstract

“…A number of studies have been conducted so far on SSR mitigation using TCSC [3][4][5][6][7], the authors in Ref. [8] introduced that TCSC is attractive to SSR mitigation. However, the benefits of TCSC for SSR mitigation depend heavily on TCSC control methods and power system configurations, and may also affect the SSR mitigation characteristics when the grid has significant changes.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Mitigation of Subsynchronous Resonance in a Korean Power Network with the First TCSC Installation

et al. 2019

View full text Add to dashboard Cite

This paper presents a detailed analysis results of the effect of a thyristor-controlled series capacitor (TCSC) on subsynchronous resonance (SSR), which was first applied to a Korean power system. First, the TCSC parameters were calculated, the structure of TCSC with synchronous voltage reversal (SVR) controller was presented, and the torsional characteristics of Hanul nuclear power generator rotor were studied to investigate the natural frequency and mode shape. The test signal method was used to determine the electrical damping in the frequency range of SSR operation through an electromagnetic transient analysis program in various system configurations. The SSR phenomenon was analyzed by comparing the electrical and mechanical damping of a conventional fixed series capacitor (FSC), and the case of a TCSC installed, and the effectiveness of the TCSC without any risk of SSR was demonstrated. As a result, when installing FSC, SSR occurred under sensitive operating conditions, but SSR was prevented in the case of TCSC compensation with SVR. The results obtained in this study can be effectively applied to the installation of TCSC in real power systems.

show abstract

“…For instance, a 25Hz torsional oscillation on a generator connected to a 60Hz system will generate 35Hz electrical oscillations. The generator's shaft couples the torsional vibration and the electrical oscillation for SSR interaction [6].…”

Section: Sub-synchronous Resonance (Ssr)mentioning

confidence: 99%

“…Understanding this relationship allows engineers to identify instability sources and develop solutions which ensure reliable operation of the system for the small disturbances. [6]. Series capacitors are extensively used as an effective means of increasing power transfer capability.…”

Section: Introductionnnmentioning

confidence: 99%

“…However, the application of series capacitors may lead to the phenomenon of sub-synchronous resonance (SSR). Under a disturbance, series capacitors may excite subsynchronous oscillations, when the electrical resonant frequency of the network is close to natural torsional mode frequency of a turbine-generator shaft [6]. Under such circumstances, the shaft will oscillate at this natural frequency.…”

Section: Introductionnnmentioning

confidence: 99%

See 1 more Smart Citation