Out-of-step blocking function in distance relay using mathematical morphology

Gautam, Suresh; Brahma, Sukumar

doi:10.1049/iet-gtd.2011.0514

Cited by 40 publications

(18 citation statements)

References 19 publications

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“…Accelerating Area (A1) = Decelerating Area (A2) Rotor angle δ1corresponding to fault clearing time tcr can be computed by swing equation [20][21] .…”

Section: Analysis Of Two Area Systemmentioning

confidence: 99%

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Advanced Control Techniques for Enhance the Power System Stability at OOS Condition

Eltamaly

Mossa

El‐Sayed

et al. 2019

I-ES

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<p>The power system stability is the accurate operation of the electric grid by restoring balance after being subjected to an abnormal condition such as fault, line switching, load rejection, and loss of excitation. Protective equipment in high voltage substations should fast and precisely localize the faults. Some abnormal conditions in the power system such as out-of-step (OOS) condition which is not a real fault, but the protection equipment will consider it is. This misjudgment will cause the loss of synchronism between areas within the power system or between interconnected systems and will lead to blackout of the national grid. This paper studied the OOS condition, philosophy of protection relay device and how to avoid the false operation for distance function by Out of Step Blocking (OSB) by using the advanced protection relay, to improve the stability of power system. </p>

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“…Accelerating Area (A1) = Decelerating Area (A2) Rotor angle δ1corresponding to fault clearing time tcr can be computed by swing equation [20][21] .…”

Section: Analysis Of Two Area Systemmentioning

confidence: 99%

“…Again, consider simple two machine system connected by a transmission line of impedance ZL as shown in Fig. 1, where machine B is treated as reference [21][22] . Now, impedance seen by relay is given by the following equation, Assuming for simplicity, both the voltages as equal to 1pu, i.e.…”

Section: Determination Of Power Swing Locusmentioning

confidence: 99%

Advanced Control Techniques for Enhance the Power System Stability at OOS Condition

Eltamaly

Mossa

El‐Sayed

et al. 2019

I-ES

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show abstract

“…In this paper based on the Bayesian approach, a dependency function of the generators with estimated characteristics has been presented. In Gautam and Brahma, by using mathematical morphology (MM) method, power swing is detected. Also based on the MM analysis, a relay blocking logic is proposed to implement a fast and effective OOS function.…”

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%

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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“…This method requires many simulations in different conditions for training and even retraining in new case. Mathematical morphology is presented in [11] for detecting symmetrical fault during power swing and it is based on monitoring shape of signal. Although this method uses time domain transformation, selection of processing function and its length is difficult.…”

Section: Introductionmentioning

confidence: 99%

Adaptive concentric power swing blocker

Khodaparast

Khederzadeh

2016

Prot Control Mod Power Syst

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The main purpose of power swing blocking is to distinguish faults from power swings. However, the faults occur during a power swing should be detected and cleared promptly. This paper proposes an adaptive concentric power swing blocker (PSB) to overcome incapability of traditional concentric PSB in detecting symmetrical fault during power swing. Based on proposed method, two pairs of concentric characteristics are anticipated which the first one is placed in a stationary position (outer of zone3) but the position of the second pair is adjustable. In order to find the position of the second pair of characteristic, Static Phasor Estimation Error (SPEE) of current signal is utilized in this paper. The proposed method detects the abrupt change in SPEE and puts the second pair of characteristic in location of impedance trajectory correspondingly. Second concentric characteristic records travelling time of impedance trajectory between outer and inner zones and compares to threshold value to detect symmetrical fault during power swing. If recorded time is lower than threshold, three-phase fault is detected during power swing. Intensive studies have been performed and the merit of the method is demonstrated by some test signals simulations.

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Out-of-step blocking function in distance relay using mathematical morphology

Cited by 40 publications

References 19 publications

Advanced Control Techniques for Enhance the Power System Stability at OOS Condition

Advanced Control Techniques for Enhance the Power System Stability at OOS Condition

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

Adaptive concentric power swing blocker

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