Area angles monitor area stress by responding to line outages

Darvishi, Atena; Dobson, Ian; Oi, Akihiro; Nakazawa, Chikashi

doi:10.1109/naps.2013.6666903

Cited by 4 publications

(6 citation statements)

References 8 publications

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“…Plotting this relationship between the maximum power that could enter the area and the area angle can reveal and identify those exceptional outages that are outliers that do not follow the bulk relationship. 2 The most common reason for these exceptional line outages causing a local power redistribution problem is proximity to large generation or load inside the area 3 [14].…”

Section: Finding Outages That Cause Local Power Redistribution Promentioning

confidence: 99%

“…We note that synchrophasor measurements around the border of an area can be also advantageous for other applications such as combining AC voltage measurements in a transmission corridor to monitor voltage collapse [11] or locating line outages in the area [12] or stress between areas [13]. Also we used our method for monitoring single outages [14]. In this paper we seek to monitor the bulk stress for general line outages in the area that include multiple outages.…”

Section: Introductionmentioning

confidence: 99%

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Threshold-Based Monitoring of Multiple Outages With PMU Measurements of Area Angle

Darvishi

Dobson

2016

IEEE Trans. Power Syst.

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When power grids are heavily stressed with a bulk power transfer, it is useful to have a fast indication of the increased stress when multiple line outages occur. Reducing the bulk power transfer when the outages are severe could forestall further cascading of the outages. We show that synchrophasor measurements of voltage angles at all the area tie lines can be used to indicate the severity of multiple outages. These synchrophasor measurements are readily combined into an "area angle" that can quickly track the severity of multiple outages after they occur. We present a procedure to define thresholds for the area angle that relate to the maximum power that can be transferred through the area until a line limit is reached. Then in real time we would monitor the area angle and compare it to the thresholds when line outages occur to determine the urgency (or not) of actions to reduce the bulk transfer of power through the area. The procedure also identifies exceptional cases in which separate actions to resolve local power distribution problems are needed. We illustrate the thresholds and monitoring with the area angle across several states of Northwestern USA. Abstract-When power grids are heavily stressed with a bulk power transfer, it is useful to have a fast indication of the increased stress when multiple line outages occur. Reducing the bulk power transfer when the outages are severe could forestall further cascading of the outages. We show that synchrophasor measurements of voltage angles at all the area tie lines can be used to indicate the severity of multiple outages. These synchrophasor measurements are readily combined into an "area angle" that can quickly track the severity of multiple outages after they occur. We present a procedure to define thresholds for the area angle that relate to the maximum power that can be transferred through the area until a line limit is reached. Then in real time we would monitor the area angle and compare it to the thresholds when line outages occur to determine the urgency (or not) of actions to reduce the bulk transfer of power through the area. The procedure also identifies exceptional cases in which separate actions to resolve local power distribution problems are needed. We illustrate the thresholds and monitoring with the area angle across several states of Northwestern USA.

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Section: Finding Outages That Cause Local Power Redistribution Promentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Threshold-Based Monitoring of Multiple Outages With PMU Measurements of Area Angle

Darvishi

Dobson

2016

IEEE Trans. Power Syst.

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“…Boundary Buses with Weights non-islanding line outages, and relating changes in the area angle to the area susceptance and the outage severity. We take out each line in the system in turn and calculate the monitored area angle θ To quantify the severity of each outage, we compute the maximum power that can enter the area after the outage of each line; for more detail see [6]. The real power through the area is increased by increasing the power entering at each border bus proportionally.…”

Section: Results For Angles Across Areas Of Weccmentioning

confidence: 99%

Synchrophasor monitoring of single line outages via area angle and susceptance

Darvishi

Dobson

2014

2014 North American Power Symposium (NAPS)

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Abstract-Synchrophasor monitoring of angles around the area has been used to track the area stress caused by the single outage. We applied the idea of the area angle which is a combination of synchrophasor measurements of voltage angles around the border of the area to measure the severity of the single line outages inside the area. Both idealized and practical examples are given to show that the variation of the area angle for single line outages can be approximately related to changes in the overall susceptance of the area and the line outage severity.

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“…For both areas, we are interested in monitoring the north-south area stress with the area angle when there are single non-islanding line outages, and relating changes in the area angle to the area susceptance and the outage severity. We take out each line in the system in turn and calculate the monitored area angle θ To quantify the severity of each outage, we compute the maximum power that can enter the area after the outage of each line; for more detail see (37). The real power through the area is increased by increasing the power entering at each border bus proportionally.…”

Section: Results For Angles Across Areas Of Weccmentioning

confidence: 99%

“…We note that synchrophasor measurements around the border of an area can be also advantageous for other applications such as combining AC voltage measurements in a transmission corridor to monitor voltage collapse (29) or locating line outages in the area (30) or stress between areas (19). Also we used our method for monitoring single outages (37). In this work we seek to monitor the bulk stress for general line outages in the area that include multiple outages.…”

Section: Resultsmentioning

confidence: 99%

Monitoring of single and multiple line outages with synchrophasors in areas of the power system

Darvishi¹

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Area angles monitor area stress by responding to line outages

Cited by 4 publications

References 8 publications

Threshold-Based Monitoring of Multiple Outages With PMU Measurements of Area Angle

Threshold-Based Monitoring of Multiple Outages With PMU Measurements of Area Angle

Synchrophasor monitoring of single line outages via area angle and susceptance

Monitoring of single and multiple line outages with synchrophasors in areas of the power system

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