A New Out-of-Step Relay with Rate of Change of Apparent Resistance Augmentation

Taylor, C.W.; Haner, J. M.; Hill, Lucas; Mittelstadt, W.A.; Cresap, R. L.

doi:10.1109/tpas.1983.317984

Cited by 91 publications

(18 citation statements)

References 2 publications

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“…1, the out-of-step relay indicated by M2 on 136-135 line is such a location. By detecting that the out-of-step relay operation may occur at an undesirable location, ample time is available to block the relay from operation and transfer the tripping to a desirable location [18], [19].…”

Section: Out-of-step Blocking and Transfer Trippingmentioning

confidence: 99%

On Power System Controlled Separation

Adibi¹,

Kafka²,

Maram

et al. 2006

IEEE Trans. Power Syst.

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This paper describes verification of five conjectures related to power system controlled separation. It attempts to verify that the location of uncontrolled separation (loss of synchronism or out-of-step operation) is independent of the location and severity (short-circuit duty or duration) of the initial faults, that the location depends on the prevailing network configuration and load level, and that it takes place one operation at a time (cascades). Verification of these conjectures would allow controlled separation during a disturbance in real-time, using the present communication and protection systems, and results in a minimal load and generation imbalance. Two actual power systems were used, a 50-bus system to establish the procedure for controlled separation and a 640-bus interconnection to apply the procedure. Data representing static and dynamic behavior of the two power systems were obtained from the operating utilities, and the many required simulations were conducted using EPRI Power System Analysis Package (including IPFLOW and ETMSP programs).

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Section: Out-of-step Blocking and Transfer Trippingmentioning

confidence: 99%

On Power System Controlled Separation

Adibi¹,

Kafka²,

Maram

et al. 2006

IEEE Trans. Power Syst.

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“…In comparison to uncontrolled islanding, which may happen in a blackout, controlled islanding can help to minimize the disturbance of power supply to a system as early as possible and facilitate the recovery process afterwards. Controlled islanding strategies have been extensively discussed in [1,[4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, line switching has been proved as an effective method for power grid operations to reduce the operational costs as well as to improve the reliability (see [13,14]). In order to trigger line switching some protection devices such as R-Rdot out-of-step relays discussed in [5,15] can be used.…”

Section: Introductionmentioning

confidence: 99%

Large-scale stochastic power grid islanding operations by line switching and controlled load shedding

2016

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Recently, there has been an increasing concern regarding the security and reliability of power systems due to the onerous consequences of cascading failures. Among many emergency control operations, controlled power grid islanding is a last resort yet powerful method to prevent large-scale blackouts. Islanding operations split the power grid into self-sufficient operational subnetworks and avoid cascading failures by isolating the failed elements of the power system into a non-operational island. In this paper, we consider a two-stage stochastic mixed-integer program to seek the optimal islanding operations under severe contingency states. Line switching and controlled load shedding are the main tools for the islanding operations and load shedding is considered as a measurement to gauge system's inability to respond to disruption. The number of possible extreme contingencies grows exponentially as the size of the grid increases, and this results in a large-scale mixed-integer program, which is a computationally challenging problem to solve. We present an efficient decomposition method to solve this problem for large-scale power systems.

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“…The response-based R-Rdot relays [4], [5] or other "on-theway-in" swing indicators could be used to initiate remedial actions preventing instabilities and hence avoiding uncontrolled islanding under certain conditions. (It is to be noted that the relays identified in [4] and [5] are no longer in service in the system.)…”

Section: Introductionmentioning

confidence: 99%

Controlled Islanding Demonstrations on the WECC System

Vittal

Meklin³

et al. 2011

IEEE Trans. Power Syst.

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Cascading outages have resulted in significant disruptions to power systems all over the world. Controlled islanding can provide a corrective measure of last resort to alleviate the impact of large disturbances. This paper provides detailed demonstrations of using controlled islanding to prevent cascading outages in bulk power systems. To test the islanding performance, four extreme contingencies under two different operating conditions of the WECC system are tested using time domain simulations. The cutsets used in the controlled islanding cases are obtained from a software package developed in earlier work by the authors. Time domain simulation results for the four contingencies with controlled islanding and uncontrolled islanding are shown, and the dynamic performance in each case is analyzed. Further analyses are conducted to examine the amount of load shed in each case, and a discussion of the cutset sensitivity and time sensitivity of islanding is provided. Finally, the discussion of practical implementation issues and conclusions is provided.

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A New Out-of-Step Relay with Rate of Change of Apparent Resistance Augmentation

Cited by 91 publications

References 2 publications

On Power System Controlled Separation

On Power System Controlled Separation

Large-scale stochastic power grid islanding operations by line switching and controlled load shedding

Controlled Islanding Demonstrations on the WECC System

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