Effects of forced oscillations in power system damping estimation

Vanfretti, Luigi; Bengtsson, Sebastian; Perić, Vedran S.; Gjerde, J.O.

doi:10.1109/amps.2012.6344015

Cited by 45 publications

(21 citation statements)

References 12 publications

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“…Such knowledge, previously unavailable, may help in characterizing the behaviour of forced oscillations in the Nordic grid more in detail in further studies. An analysis on the impact of forced oscillations on damping estimation is provided by the authors in a separate publication [20].…”

Section: Discussionmentioning

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]. The remainder of this article is organized as follows: Section II briefly summarizes the preprocessing algorithm used.…”

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: Discussionmentioning

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

Self Cite

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“…[13]- [15]. This kind of oscillation is not a result of the general dynamics of power system, instead, it is caused by an external forcing with a distinct oscillatory behavior.…”

Section: Forced Oscillationmentioning

confidence: 99%

Data-driven diagnostics of mechanism and source of sustained oscillations

Wang

Turitsyn

2016

2016 IEEE Power and Energy Society General Meeting (PESGM)

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Abstract-Sustained oscillations observed in power systems can damage equipment, degrade the power quality and increase the risks of cascading blackouts. There are several mechanisms that can give rise to oscillations, each requiring different countermeasure to suppress or eliminate the oscillation. This work develops mathematical framework for analysis of sustained oscillations and identifies statistical signatures of each mechanism, based on which a novel oscillation diagnosis method is developed via realtime processing of phasor measurement units (PMUs) data. Case studies show that the proposed method can accurately identify the exact mechanism for sustained oscillation, and meanwhile provide insightful information to locate the oscillation sources.

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“…Power oscillations in power systems are categorized by several authors over the years [1], [2], [3]. Power system oscillations generally are of two types: 1) Natural electromechanical oscillation and 2) Forced oscillation (FO).…”

Section: Introductionmentioning

confidence: 99%

“…whereas FOs are caused by 1) cyclic (periodic) load or cyclic input 2) execution of control action 3) diesel, wind generators 4) incomplete separation of asynchronous areas 5) defect in hardware 6) system test 7) resonance etc. Regulation system of steam turbines can also cause this kind of oscillatory behavior [2]. Readers may go through references [6][7][8][9][10][11][12][13] for more details on FOs and its causes.…”

Section: Introductionmentioning

confidence: 99%

Frequency monitoring of forced oscillation in PMU's data from NASPI

Kumar

Kishor

Shweta

2016

2016 18th Mediterranean Electrotechnical Conference (MELECON)

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This paper presents a systematic approach to detect the frequency of Forced Oscillation (FO) in real-time signals obtained from phasor measurement units (PMUs). It is shown that, preprocessing of the signal by Empirical Mode Decomposition (EMD) technique leads to effective detection. The designed methodology can detect the frequency of FOs even in the presence of multiple mode mixing, whereas the self-coherence method fails to detect. Spectral analysis is performed on the Intrinsic Mode Functions (IMFs) to determine the frequency of FO. To further confirm the sustainability of the oscillation, spectral analysis of timedelayed signals is also performed and the results are discussed. The study is investigated on both simulated signal and real-time PMU signal of North American SynchroPhasor Initiative (NASPI). Two forced oscillations; FO 1 (14.67 Hz) and FO 2 (4.62 Hz) are detected in the NASPI PMU's signal by the proposed approach. Keywords-Forced oscillations; power spectral density (PSD); empirical mode decomposition (EMD); North American synchro phasor initiative (NASPI).

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Effects of forced oscillations in power system damping estimation

Cited by 45 publications

References 12 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

Data-driven diagnostics of mechanism and source of sustained oscillations

Frequency monitoring of forced oscillation in PMU's data from NASPI

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