A new algorithm for predicting out-of-step condition in large-scale power systems using rotor speed-acceleration

Sobbouhi, Ali Reza; Aghamohammadi, Mohammad Reza

doi:10.1002/etep.2088

Cited by 11 publications

(7 citation statements)

References 32 publications

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“…In another view, it is possible to evaluate OOS status by other generator variables as shown in Figure 3A to D. It is indicated that after a fault, rotor angle starts to increase from its initial point P from which in stable conditions, rotor angle slows down oscillatory to a stable equilibrium point (SEP) while for an unstable fault scenario, the angle increases monotonically until passing through UEP that means an OOS condition has been occurred. FIGURE 1 Two-machine system 34…”

Section: Concept Of Out-of-stepmentioning

confidence: 99%

“…In Sobbouhi and Aghamohammadi, by using rotor speed‐acceleration data obtained from PMU measurements, an algorithm based on the rate of change of speed‐acceleration is proposed for predicting OOS condition of the generator. In Sobbouhi and Aghamohammadi, a prediction algorithm based on the locus of rotor speed‐acceleration variation constructed from data obtained by PMU measurements is proposed and applied to a large‐scale realistic power system. In Alinezhad et al, by calculating postfault Thévenin equivalent from synchronized phasor measurements and based on equal area criterion, an OOS predictive technique is presented from which by calculating the acceleration and deceleration areas corresponding to the fault and postfault conditions, an OOS condition is predicted.…”

Section: Introductionmentioning

confidence: 99%

“…It is seen that generally the algorithms for recognizing OOS condition can be categorized into 2 groups: detection algorithms [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] and prediction algorithms. [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] In Table 1, it is concluded that a number of conventional methods including an adaptive OOS relay, based on the classical equal area criterion using power angle (P-δ), are proposed in which the newly developed technology of synchronized phasor measurements plays an important role. 2 In Taylor et al, 3 the property of the rate of change of apparent impedance is used for proposing an OOS relaying scheme.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Intelligent prediction of out-of-step condition on synchronous generators because of transient instability crisis

Zare

Alinejad‐Beromi

Yaghobi

2018

Int Trans Electr Energ Syst

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Summary This paper presents an adaptive scheme for predicting out‐of‐step (OOS) condition of synchronous generator based on the Bayesian technique. The proposed scheme performs as an intelligent OOS method for synchronous generators from which by using training variables, the tripping signals are estimated. For classifying target classes between stable and OOS conditions, a series of measurements are derived under various fault scenarios including topological and operational disturbances. The tripping signals are estimated by using feature selection technique based on the Bayesian technique. In this procedure, the data of input variables and corresponding output target classes are implemented as input‐output pair data for Bayesian training and testing. For this propose, the ability of the OOS protective scheme is examined for a number of unseen samples in working mode. The proposed approach is applied on IEEE 39‐bus test system from which by using trained variables, the tripping signals are estimated online. Furthermore, to evaluate the proposed protective scheme in real‐time environment, a 2‐machine experimental case is used to assess the effectiveness of the proposed scheme. The results show a promising performance of proposed protective scheme for proper estimating of tripping signals.

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Section: Concept Of Out-of-stepmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Intelligent prediction of out-of-step condition on synchronous generators because of transient instability crisis

Zare

Alinejad‐Beromi

Yaghobi

2018

Int Trans Electr Energ Syst

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“…In Krata et al and So et al, the frequency difference between 2 line ends is used to identify the oscillation center, but corresponding oscillation blocking scheme is not put forward. In Qin et al and Sobbouhi and Aghamohammadi, criteria to identify system out‐of‐step based on WAMS dynamic trajectory and PMU measurements are proposed, but the oscillation center is not located.…”

Section: Introductionmentioning

confidence: 99%

Distance protection blocking and re-opening scheme in multi-machine power system oscillation scenes

Kang

et al. 2018

Int Trans Electr Energ Syst

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In view of frequent multi-machine power system oscillations in power grid which may cause traditional oscillation blocking and re-opening schemes to be completely invalid, a distance protection oscillation blocking and re-opening scheme in multi-machine power system oscillation scenes is proposed in this paper. First, the ride-through trajectory of measured impedance in multimachine power system oscillation cases and its effect on the operation characteristic of distance protection is analyzed, and the oscillation blocking scheme is formed by combining the operation status information of protection components on 2 line ends. And then, in the oscillation blocking duration, by calculating the estimated error of the dynamic phasor of measured current at the relaying point, the protection re-opening scheme for symmetrical fault during oscillation is established. Finally, simulation tests on PSCAD in 3-machine system and IEEE 39-bus system verify that the proposed scheme could reliably block the protection when oscillation occurs in multi-machine power system, and re-open the protection accurately and reliably when symmetrical fault occurs during oscillation. KEYWORDS distance protection, dynamic phasor, multi-machine power system oscillation, oscillation blocking 1 | INTRODUCTION When power system is disturbed by factors such as transmission line fault and heavy-load line switch on/off, etc., oscillation will easily result. 1 The incorrect operation of distance protection on transmission line which identifies whether fault occurs by calculating the measured impedance during oscillation will enlarge the influence range of oscillation, greatly endangering the safe and stable operation of power system. 2 In regional inter-connected power grid that is becoming ever more complicated, the probability of multi-machine power system oscillation is also increasing rapidly, 3 in which case the oscillation center may move dynamically along different routes, causing traditional double-source analysis model to be invalid. 4,5 Therefore, it is urgent to study in depth the effect of multi-machine power system oscillation on existing protection policy and put forward effective oscillation blocking and protection re-opening scheme.Currently, research on oscillation blocking is mostly based on 2-generator model and is mainly focused on the following aspects. First, identification criteria based on swing center voltage (SCV) could realize re-opening for symmetrical fault during oscillation, with certain time delay. 6,7 Second, identification criteria based on the compensation principle could determine whether it is oscillation or short circuit fault that occurs within the protection range, but it is difficult to set the compensation value when the line is heavily loaded. 8,9 Third, identification criteria based on the apparent

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“…In previous studies, comparing the postdisturbance voltage trajectories with predefined voltage templates is used to predict the OOS. In 1 study, a new algorithm for predicting OOS condition in large‐scale power systems using rotor speed‐acceleration is proposed, which analyzes the trend of the movement of the (ω − α) locus curve in the plane for predicting and detecting the OOS. An effective response‐based technique for closed‐loop transient stability emergency control is proposed in the work of Glavic et al, to predict and control the instability of the power system.…”

Section: Introductionmentioning

confidence: 99%

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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A new algorithm for predicting out-of-step condition in large-scale power systems using rotor speed-acceleration

Cited by 11 publications

References 32 publications

Intelligent prediction of out-of-step condition on synchronous generators because of transient instability crisis

Intelligent prediction of out-of-step condition on synchronous generators because of transient instability crisis

Distance protection blocking and re-opening scheme in multi-machine power system oscillation scenes

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

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