Nonlinear contingency screening for voltage collapse
First Claim
1. A method for estimating the amount of stress, expressed in megawatts and/or megavars, a power system can handle before occurrence of a widespread blackout comprising the steps of:
- obtaining a normal bifurcation point;
estimating, from the normal bifurcation point, a post-contingency voltage collapse point of said power system following one of a set of generator unit outages and a set of branch outages; and
calculating a distance to collapse of said power system.
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Abstract
A method for estimating the severity of generator unit outage and multi-terminal branch outage contingencies with respect to voltage collapse in large-scale electric power systems which includes the steps of estimating a post-contingency saddle-node bifurcation induced voltage collapse point of an electric power system following a set of generator unit outages and/or a set of branch outages and calculating a distance to collapse of said power system. The post-contingency voltage collapse point is determined by application of a nonlinear contingency screening method.
49 Citations
10 Claims
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1. A method for estimating the amount of stress, expressed in megawatts and/or megavars, a power system can handle before occurrence of a widespread blackout comprising the steps of:
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obtaining a normal bifurcation point;
estimating, from the normal bifurcation point, a post-contingency voltage collapse point of said power system following one of a set of generator unit outages and a set of branch outages; and
calculating a distance to collapse of said power system. - View Dependent Claims (2, 3, 4)
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5. A method for estimating the severity of generator unit outage and multi-terminal branch outage contingencies with respect to voltage collapse in large-scale electric power systems comprising the steps of:
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obtaining a normal bifurcation point;
estimating, from the normal bifurcation point, a post-contingency saddle-node bifurcation point of an electric power system following one of a set of generator unit outages and a set of branch outages; and
calculating a distance to collapse of said power system. - View Dependent Claims (6)
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7. A method for estimating the severity of generator unit outage and multi-terminal branch outage contingencies with respect to voltage collapse in large-scale electric power systems comprising the steps of:
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obtaining a normal bifurcation point;
deriving nonlinear sensitivities of the normal bifurcation point with respect to a contingency parameter; and
estimating, via the nonlinear sensitivities of the normal bifurcation point, a post-contingency bifurcation point for each contingency in a given contingency list. - View Dependent Claims (8, 9, 10)
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Specification