Evaluation of the impact of a large cyclic load on the LILCO power system using time simulation and frequency domain techniques

Rostamkolai, N.; Piwko, R.J.; Matusik, A.S.

doi:10.1109/59.336123

Cited by 31 publications

(29 citation statements)

References 2 publications

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“…Xuanyin et al [17] reports that the regulation system of steam turbines can cause this kind of oscillatory behaviour. Other authors have investigated the impact of cyclic loads in the system [16,18]. Vournas et al [19] report diesel generators as one of the possible causes for forced low-frequency oscillations.…”

Section: Forced Oscillationsmentioning

confidence: 99%

“…It is identified that some modes have temporary character (modes disappear after some time) whereas some are permanent, furthermore, some identified modes are not result of the system itself but of forced oscillation which are caused by oscillatory behaviour of some elements in the power system [16,17,18,19]. An analysis on the impact of forced oscillations on damping estimation is provided by the authors in a separate publication [20].…”

Section: Introductionmentioning

confidence: 99%

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Spectral estimation of low-frequency oscillations in the Nordic grid using ambient synchrophasor data under the presence of forced oscillations

Vanfretti

Bengtsson

Perić

et al. 2013

2013 IEEE Grenoble Conference

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Abstract-Spectral analysis applied to synchrophasor data can provide valuable information about lightly damped lowfrequency modes in power systems. This paper demonstrates application of two non-parametric spectral estimators focusing on mode frequency estimation. The first one is the well-known Welch spectral estimator whereas the application of Multitaper method is proposed here. In addition, the paper discusses mode estimator tuning procedures and the estimators' performances in the presence of "forced" oscillations. The validity of the proposed application of the non-parametric estimators and tuning procedures is verified through both simulated data and PMU data originating from the high-voltage grid of the Nordic power system. Special attention is given to the analysis of the behaviour of different low frequency modes present in the Nordic grid, including that of forced oscillations.

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Section: Forced Oscillationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spectral estimation of low-frequency oscillations in the Nordic grid using ambient synchrophasor data under the presence of forced oscillations

Vanfretti

Bengtsson

Perić

et al. 2013

2013 IEEE Grenoble Conference

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“…In practice, causes of sustained oscillations could be the excitation system [5], diesel engine [6], synchrotron as a cyclic load [7], control valve [8], turbopressure pulsation [9], governor control [10], asynchronous parallelizing of synchronous generators [11] and improper parameters for the steam turbine controller [12], et al The purpose of a location method is to find the geographical location of the source, e.g. down to the substation level or control block level.…”

Section: Introductionmentioning

confidence: 99%

Location methods of oscillation sources in power systems: a survey

Wang

Sun

2016

J. Mod. Power Syst. Clean Energy

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The deployment of a synchrophasor-based widearea measurement system (WAMS) in a power grid largely improves the observability of power system dynamics and the operator's real-time situational awareness for potential stability issues. The WAMS in many power grids has successfully captured system oscillation events, e.g. poorly damped natural oscillations and forced oscillations, from time to time. To identify the root cause of an observed oscillation event for further mitigation actions, many methods have been proposed to locate the source of oscillation based on different ideas and principles. However, most methods proposed so far for locating the oscillation source in a power grid are not reliable enough for practical applications. This paper presents a comprehensive review of existing location methods, which basically fall into four major categories, plus a few other methods. Their advantages and disadvantages are discussed in detail. Some trends and challenges on the problem of oscillation source location are pointed out along with potential future research directions. Finally, a practical, general scheme for oscillation source location using available location methods is suggested and analyzed.

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“…Previous work has pointed out that cyclic external disturbances can result in a significant response in power systems, when their fundamental frequency is close to the low-frequency oscillation mode (including inter-area mode) of the system [3,4]. These kinds of oscillations are termed forced oscillations.…”

Section: Introductionmentioning

confidence: 99%

Effect of Tower Shadow and Wind Shear in a Wind Farm on AC Tie-Line Power Oscillations of Interconnected Power Systems

Tan

Wang

et al. 2013

Energies

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This paper describes a frequency domain approach for evaluating the impact of tower shadow and wind shear effects (TSWS) on tie-line power oscillations. A simplified frequency domain model of an interconnected power system with a wind farm is developed. The transfer function, which relates the tie-line power variation to the mechanical power variation of a wind turbine, and the expression of the maximum magnitude of tie-line power oscillations are derived to identify the resonant condition and evaluate the potential risk. The effects of the parameters on the resonant magnitude of the tie-line power are also discussed. The frequency domain analysis reveals that TSWS can excite large tie-line power oscillations if the frequency of TSWS approaches the tie-line resonant frequency, especially in the case that the wind farm is integrated into a relatively small grid and the tie-line of the interconnected system is weak. Furthermore, the results of the theoretical analysis are validated through time domain simulations conducted in the two-area four-generator system and the Western Electric Coordinating Council 127 bus system.

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Evaluation of the impact of a large cyclic load on the LILCO power system using time simulation and frequency domain techniques

Cited by 31 publications

References 2 publications

Spectral estimation of low-frequency oscillations in the Nordic grid using ambient synchrophasor data under the presence of forced oscillations

Spectral estimation of low-frequency oscillations in the Nordic grid using ambient synchrophasor data under the presence of forced oscillations

Location methods of oscillation sources in power systems: a survey

Effect of Tower Shadow and Wind Shear in a Wind Farm on AC Tie-Line Power Oscillations of Interconnected Power Systems

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