Application of equal area criterion conditions in the time domain for out-of-step protection

Paudyal, Sumit; Gokaraju, Ramakrishna; Sachdev, Manoj

doi:10.1109/pes.2010.5589303

Cited by 14 publications

(18 citation statements)

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“…Equal area method is defined for transient stability assessment in OMIB system [17][18][19], in which the acceleration area being smaller than the deceleration area is the stability criterion. The relation between PKE and acceleration area S add in fault and deceleration area S sub in the post-fault system is proved as follows…”

Section: Physical Meaning Of the Criterion In One Machine Infinite Bumentioning

confidence: 99%

“…Then, the trajectories in the prediction window Y pre can be forecasted through (16) and (17). The equations of Y w and Y pre can be written as follows…”

Section: Trajectory Prediction Of Apsmentioning

confidence: 99%

“…To realise fast online transient stability assessment, other researches reported in the literature concentrate on the stability criterion based on the system dynamic response, including energy function analysis [13], phase-plane trajectories [14][15][16] and equal area criterion [17][18][19]. These methods can decide the transient stability without pre-existing results obtained from the time-domain simulation.…”

Section: Introductionmentioning

confidence: 99%

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Criterion to evaluate power system online transient stability based on adjoint system energy function

Zhao

Jia

Fang

et al. 2015

IET Generation, Transmission & Distribution

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In this paper, a new criterion to quickly evaluate the system transient stability based on wide area measurement system (WAMS) information, energy function method and adjoint power system (APS) model is proposed. APS is a two-dimensionalfirst-order differential equation model, which can be considered as a virtual representation to the real power system. Meaning of APS is first explained by using the one machine infinite bus system. Then, a new criterion based on projection kinetic energy of APS is proposed to determine the transient stability of the original power system with multiple generators. Trajectory prediction method based on curve fitting technique is adopted to accelerate the evaluation process. The proposed method is sufficiently rapid since it does not rely on the network structure, system model, system parameters and the identification of the coherent generator groups. Therefore, it can be utilised for online transient stability assessment based on WAMS. Simulation results on the New England system and one of North China Power System validate the correctness and effectiveness of the proposed method. Nomenclature Minertia constant of OMIB system M i inertia constant of ith generator P mi mechanical power output of ith generator P ei electrical power output of ith generator P e1 electrical power output of the generator in pre-fault P e2 electrical power output of the generator in fault P e3 electrical power output of the generator in post-fault t system time t cl fault clearing time Δt sampling time interval of WAMS α rotor acceleration of OMIB system α i ith rotor acceleration in COI reference δ rotor angle of OMIB system δ re maximum rotor angle of OMIB system in a stable swing δ cr critical rotor angle of OMIB system θ i ith rotor angle in centre of inertia (COI) reference ω rotor speed of OMIB system v i ith rotor speed in COI reference

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Section: Physical Meaning Of the Criterion In One Machine Infinite Bumentioning

confidence: 99%

“…Then, the trajectories in the prediction window Y pre can be forecasted through (16) and (17). The equations of Y w and Y pre can be written as follows…”

Section: Trajectory Prediction Of Apsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Criterion to evaluate power system online transient stability based on adjoint system energy function

Zhao

Jia

Fang

et al. 2015

IET Generation, Transmission & Distribution

View full text Add to dashboard Cite

show abstract

“…However, as the systems became larger, and the complexity of the systems grew, this method became far too simplistic for use in multimachine applications and one important drawback of the equal area approach is that where the critical clearing angle may be calculated the critical clearing time remains unknown [6]. Therefore, it is not applicable for online application and instantaneous actions to maintain stability [7].…”

Section: Introductionmentioning

confidence: 99%

“…Most of the methods reported in the literature focus on the stability criterion based on the system dynamic response that can decide the transient stability without the need for results obtained from the time-domain simulation. These methods include energy function analysis [8], phase-plane trajectories [9,10], timedomain equal-area criterion [7,11] and Lyapunov's method [12]. However, in multi-machine power systems, the generator groups must be identified before the online stability assessment.…”

Section: Introductionmentioning

confidence: 99%

Augmentation of transient stability margin based on rapid assessment of rate of change of kinetic energy

Al-Taee

Al-Nuaimy

2016

Electric Power Systems Research

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Predictive out-of-step relay based on equal area criterion and PMU data

Alinezhad

Karegar

2017

Int. Trans. Electr. Energ. Syst.

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This paper proposes a novel-predictive and setting-free out-of-step protection technique based on synchronized phasor measurements and equal area criterion. Generator instability is predicted by comparing the acceleration and deceleration areas corresponding to the fault and postfault conditions, respectively. For each generator, the acceleration area during fault condition is calculated directly using the generator output power and rotor angle in real time. As soon as the fault is cleared, the deceleration area is predicted based on estimating the postfault Thévenin equivalent of the power network. The proposed technique is verified on the New England 39-bus test network. The effect of the proposed technique on improvement of the power network stability is compared with that of the well-known impedancebased out-of-step relay. KEYWORDS equal area criterion, impedance-based OOS relay, out-of-step, phasor measurement unit, Thévenin equivalent

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Application of equal area criterion conditions in the time domain for out-of-step protection

Cited by 14 publications

References 0 publications

Criterion to evaluate power system online transient stability based on adjoint system energy function

Criterion to evaluate power system online transient stability based on adjoint system energy function

Augmentation of transient stability margin based on rapid assessment of rate of change of kinetic energy

Predictive out-of-step relay based on equal area criterion and PMU data

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