Synchrophasor-assisted zone 3 operation

Kundu, Pranab Kumar; Pradhan, Ashok Kumar

doi:10.1109/pesgm.2015.7285616

Cited by 18 publications

(38 citation statements)

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“…This prevents load swings during extreme conditions from being misinterpreted as faults and helps prevent the maloperation of backup relays from allowing a wide area disturbance to spread through the system. The enhancement of backup protection has been a particular focus of recent work and methods based on wide area impedances and current indices [37], net current injection into predefined zones [38], and voltage measurements [39], have been proposed. Furthermore, recent work [40] has presented a scheme that is designed for the specific and challenging case of series compensated lines.…”

Section: Power Swingmentioning

confidence: 99%

Improving the performance of power system protection using wide area monitoring systems

Phadke

Wall

Ding

et al. 2016

J. Mod. Power Syst. Clean Energy

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Wide area monitoring (WAM) offers many opportunities to improve the performance of power system protection. This paper presents some of these opportunities and the motivation for their development. This methods include monitoring the suitability of relay characteristics, supervisory control of backup protection, more adaptive and intelligent system protection and the creation of novel system integrity protection scheme. The speed of response required for primary protection means that the role WAM in enhancing protection is limited to backup and system protection. The opportunities offered by WAM for enhancing protection are attractive because of the emerging challenges faced by the modern power system protection. The increasingly variable operating conditions of power systems are making it ever more difficult to select relay characteristics that will be a suitable compromise for all loading conditions and contingencies. The maloperation of relays has contributed to the inception and evolution of 70 % of blackouts, thus the supervision of the backup protection may prove a valuable tool for preventing or limiting the scale of blackouts. The increasing interconnection and complexity of modern power systems has made them more vulnerable to wide area disturbances and this has contributed to several recent blackouts. The proper management of these wide area disturbances is beyond the scope of most of the existing protection and new, adaptive system integrity protection schemes are needed to protect power system security.

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Section: Power Swingmentioning

confidence: 99%

Improving the performance of power system protection using wide area monitoring systems

Phadke

Wall

Ding

et al. 2016

J. Mod. Power Syst. Clean Energy

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“…When the system is under such stressed condition, the occurrence of a static phenomenon like load encroachment or dynamic phenomena like power swings may result in maloperation of distance relays [1][2][3][4][5]. This paves the way for fairly reduced security in power system protection.…”

Section: Introductionmentioning

confidence: 99%

An adaptive supervised wide-area backup protection scheme for transmission lines protection

Mallikarjuna

Varma

Samir

et al. 2017

Prot Control Mod Power Syst

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Maloperation of conventional relays is becoming prevalent due to ever increase in complexity of conventional power grids. They are dominant during power system contingencies like power swing, load encroachment, voltage instability, unbalanced loading, etc. In these situations, adaptive supervised wide-area backup protection (ASWABP) plays a major role in enhancing the power system reliability. A balance between security and dependability of protection is essential to maintain the reliability. This paper proposes multi-phasor measurement units (MPMU) based ASWABP scheme that can function effectively during faults besides power system contingencies. MPMU is an extended version of Phasor Measurement Unit (PMU). It is an intelligent electronic device which estimates the synchronized predominant harmonic phasors (100Hz and 150Hz) along with the fundamental phasors (50Hz) of three phase voltages and currents with high precision. The proposed ASWABP scheme can detect the fault, identify the parent bus, determine the faulty branch and classify the faults using MPMU measurements at System Protection Center (SPC). Based on these MPMU measurements (received at phasor data concentrator (PDC) at SPC) the appropriate relays will be supervised to enhance the overall reliability of the power grid. Numerous case studies are conducted on WSCC-9 bus and IEEE-14 bus systems to illustrate the security and dependability attributes of proposed ASWABP scheme in MATLAB/Simulink environment. Also, comparative studies are performed with the existing conventional distance protection (Mho relays) for corroborating the superiority of the proposed scheme regarding security and dependability. Comparative studies have shown that the proposed scheme can be used as adaptive supervised wide-area backup protection of conventional distance protection.

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“…During a power swing the voltage and current fluctuate simultaneously, causing fluctuation in the measured apparent impedance at the distance relay, which may enter the relay tripping zones. This condition causes relay malfunction and may lead to consecutive events (cascading outages) and even a blackout eventually [1][2][3].…”

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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Synchrophasor-assisted zone 3 operation

Cited by 18 publications

References 0 publications

Improving the performance of power system protection using wide area monitoring systems

Improving the performance of power system protection using wide area monitoring systems

An adaptive supervised wide-area backup protection scheme for transmission lines protection

Adaptive concentric power swing blocker

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