Emergency Voltage Stability Controls: an Overview

Cutsem, Thierry Van; Vournas, Costas

doi:10.1109/pes.2007.386089

Cited by 61 publications

(48 citation statements)

References 23 publications

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“…We consider the sensitivities of the total reactive power generation to individual load reactive powers. They are obtained from a general sensitivity formula Van Cutsem and Vournas (2007) as:…”

Section: Wide-area Voltage Instability Detectionmentioning

confidence: 99%

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Wide-Area Adaptive Load Shedding Control to Counteract Voltage Instability

Otomega

Glavić

Cutsem

2012

IFAC Proceedings Volumes

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Abstract:A two-level adaptive load shedding scheme against voltage instability is proposed, adjusting its actions to the severity of the situation. The lower level includes a set of distributed controllers which curtail loads once the voltages at monitored transmission buses fall and stay for some time below threshold values. The adaptive nature of the proposed scheme comes from the upper level adjusting those thresholds in real-time. At the time instant the upper level detects that the system enters an emergency condition, it sends a signal to the lower-level controllers requesting them to take their currently measured voltages as threshold values. The upper-level emergency detection can be based on various criteria, the key-point being that it takes advantage of a wide-area monitoring of the system. In particular, the paper illustrates the use of a voltage instability detection scheme based on sensitivity computation. In case the upper level fails sending its signal, the lower-level controllers act in purely distributed mode, each using its pre-set threshold voltage. The capabilities of the proposed scheme are illustrated on a small but realistic test system.

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Section: Wide-area Voltage Instability Detectionmentioning

confidence: 99%

“…Van Cutsem and Vournas (2007); Moors et al (2001). Also, other input signals than voltage magnitudes may be monitored.…”

Section: Introductionmentioning

confidence: 99%

Wide-Area Adaptive Load Shedding Control to Counteract Voltage Instability

Otomega

Glavić

Cutsem

2012

IFAC Proceedings Volumes

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“…loop [3], [4], [5]. Open-loop emergency control uses actions assessed off-line on the basis of simulations of postulated scenarios and does not re-adjust its actions to follow up the system evolution [1], [4].…”

mentioning

confidence: 99%

“…Open-loop emergency control uses actions assessed off-line on the basis of simulations of postulated scenarios and does not re-adjust its actions to follow up the system evolution [1], [4]. On the other hand, closed-loop emergency control assesses the disturbance severity through measurements and adjusts its actions correspondingly, possibly repeating some actions if the previously taken ones are not enough.…”

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confidence: 99%

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Adaptive wide-area closed-loop undervoltage load shedding using synchronized measurements

Glavić

Cutsem

2010

IEEE PES General Meeting

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Abstract-This paper proposes an emergency load shedding scheme aimed at stopping a developing voltage instability before system disruption. The proposed scheme has a wide-area view of the system, adapts itself to the emergency situation to be handled, and works in closed-loop. It relies on the detection of voltage instability from synchronized measurements recently proposed by the authors. It inherits the assumptions of this detection method (availability of a rich phasor measurement set and communication infrastructure). The method is adaptive in so far as the voltage thresholds used by this undervoltage load shedding scheme are determined from the measurements of the system evolution itself, and the curtailed power is adjusted to the severity of the situation. The features of the proposed scheme are illustrated on a small but realistic system.

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