Simulated and measured inter-area mode shapes and frequencies in the electrical power system of Great Britain

Turunen, Jukka; Renner, Herwig; Hung, William; Carter, Alex; Ashton, P. M.; Haarla, Liisa

doi:10.1049/cp.2015.0895

Cited by 4 publications

(6 citation statements)

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“…Figure 1 suggests that there was a Hopf bifurcation, but the general interpretation of such events in the power system community is that the oscillations are transient, triggered by a switching event, e.g. [1]. For gene expression this dichotomy has been addressed by [54].…”

Section: Discussionmentioning

confidence: 99%

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Inference of dominant modes for linear stochastic processes

MacKay

2021

R. Soc. open sci.

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For dynamical systems that can be modelled as asymptotically stable linear systems forced by Gaussian noise, this paper develops methods to infer (estimate) their dominant modes from observations in real time. The modes can be real or complex. For a real mode (monotone decay), the goal is to infer its damping rate and mode shape. For a complex mode (oscillatory decay), the goal is to infer its frequency, damping rate and (complex) mode shape. Their amplitudes and correlations are encoded in a mode covariance matrix that is also to be inferred. The work is motivated and illustrated by the problem of detection of oscillations in power flow in AC electrical networks. Suggestions of some other applications are given.

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Section: Discussionmentioning

confidence: 99%

“…Fig. 1 from [1] shows an example where such a mode of oscillation became clear. This type of oscillation is called 'inter-area'; for a review of oscillations in electrical power flow, see [2].…”

Section: Introductionmentioning

confidence: 97%

Inference of dominant modes for linear stochastic processes

MacKay

2021

R. Soc. open sci.

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“…The multiple input multiple output (MIMO) system from (15) has two inputs, the power reference P 0 and the voltage reference V ref , which are combined in the vector u from (18). The speed deviation ω as well as the output signal of the hydro governor P g are measurable and thus represent suitable output variables of the dynamic system (15).…”

Section: Design Of a Power System Stabilizermentioning

confidence: 99%

“…The larger and the more extensive an interconnected power system is, the more likely is the occurrence of inter-area oscillations [18]. Thereby one generator group oscillates against the other over long transmission lines.…”

Section: Introductionmentioning

confidence: 99%

Damping of inter-area oscillations by combining control strategies in hydropower plants

Fank

Renner

2021

Elektrotech. Inftech.

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This paper examines how the damping capability can be improved if inter-area oscillations occur by combining control strategies in hydropower plants. First, the control challenges of hydropower plants, such as the water hammer effect, are discussed. In a single-machine infinite bus system (SMIBS), the use of a Power System Stabilizer (PSS) in the generator excitation and in the governor control path as well as the combination of both strategies are examined for their effectiveness in terms of their damping capability. In addition, these results are compared with an optimal state space controller with an observer as a damping element. The Heffron-Phillips model is the design model for the PSS as well as for the model-based controller. The verification of the damping capability through the PSS variants is evaluated by using a three-machine model in the time domain and by using modal analysis.

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“…The typical frequency of power oscillations observed is around 0.5 Hz at times of high level of power transfer between Scotland and England [1]. These electromechanical oscillations are monitored by several phasor measurement units (PMUs) which are installed at different sites around the transmission system between Scotland and England to provide information to the transmission system operator (TSO) [2].…”

Section: Introductionmentioning

confidence: 99%