Method and apparatus for power outage determination using distribution system information
First Claim
1. A method for determining the location of the protective device immediately upstream of the probable location of a fault causing a power outage in a power distribution system having a power distribution grid with a power source connected to a plurality of terminal nodes by grid branches and corresponding protective devices whose operation minimizes the deleterious effects of power outages, and a control station, comprising:
- (a) determining distribution system information based on the power distribution grid;
(b) determining power outage information describing the terminal node to which the power outage information is related;
(c) identifying a set of possibly operated protective devices by upstream tracing from the terminal node, about which the power outage information was determined, to the power source;
(d) calculating a possibility that each protective device operated;
(e) calculating a cumulative possibility that each protective device operated as a function of the power outage information;
(f) comparing the cumulative possibility that each protective device operated to a predetermined confidence threshold; and
(g) if the cumulative possibility that a given protective device operated is greater than the confidence threshold, concluding that the protective device operated.
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Accused Products
Abstract
A method and apparatus are provided for determining the probable location of a fault causing a power outage in a power distribution system (20) having a power distribution grid (22) and a control station (24), the power distribution grid comprising a power source (26) connected to a plurality of terminal nodes (28) by grid branches (30), and corresponding protective devices (32), whose operation minimizes the deleterious effects of power outages. More specifically, method and apparatus are provided for determining distribution system information based on the power distribution grid (22). For each report that is thereafter received of a new power outage, a set of protective devices (32) that possibly operated in response to the fault is identified by upstream tracing from the terminal node (28) to the power source (26). Using "fuzzy set" theory, the possibility that each protective device operated is calculated. The cumulative possibility that each protective device operated is then calculated by summing the possibilities associated with unflagged reports for each protective device. This cumulative possibility is compared to a predetermined confidence threshold associated with each protective device. If the cumulative possibility that a given protective device operated is greater than the confidence threshold, a conclusion is reached that the protective device operated, and all reports that led to that conclusion are flagged so as not to contribute to future outage determinations. If the conclusion is subsequently rejected, the reports that led to the rejected conclusion are unflagged so as to contribute to future outage determinations.
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Citations
20 Claims
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1. A method for determining the location of the protective device immediately upstream of the probable location of a fault causing a power outage in a power distribution system having a power distribution grid with a power source connected to a plurality of terminal nodes by grid branches and corresponding protective devices whose operation minimizes the deleterious effects of power outages, and a control station, comprising:
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(a) determining distribution system information based on the power distribution grid; (b) determining power outage information describing the terminal node to which the power outage information is related; (c) identifying a set of possibly operated protective devices by upstream tracing from the terminal node, about which the power outage information was determined, to the power source; (d) calculating a possibility that each protective device operated; (e) calculating a cumulative possibility that each protective device operated as a function of the power outage information; (f) comparing the cumulative possibility that each protective device operated to a predetermined confidence threshold; and (g) if the cumulative possibility that a given protective device operated is greater than the confidence threshold, concluding that the protective device operated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Apparatus for determining the location of the protective device immediately upstream of the probable location of a fault causing a power outage in a power distribution system having a power distribution grid with a power source connected to a plurality of terminal nodes by grid branches and corresponding protective devices whose operation minimizes the deleterious effects of power outages, and a control station, comprising:
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(a) a memory for storing program instructions; (b) means for inputting information relating to the power distribution grid; and (c) a processing unit, coupled to said memory and said input means, for determining the location of a fault by; (i) determining distribution system information based on the power distribution grid; (ii) determining power outage information describing the terminal node to which the power outage information is related; (iii) identifying a set of possibly operated protective devices by upstream tracing from the terminal node about which the power outage information was determined to the power source; (iv) calculating a possibility that each protective device operated; (v) calculating a cumulative possibility that each protective device operated as a function of the power outage information; (vi) comparing the cumulative possibility that each protective device operated to a predetermined confidence threshold; and (vii) if the cumulative possibility that a given protective device operated is greater than the confidence threshold, concluding that the protective device operated. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification