Abstract
Contingency analysis is important for providing information about the vulnerability of power grids. Many methods have been purposed to use topological structures of power grids for analyzing contingency states. Considering failures of buses and lines, we present and compare several graph methods for selecting contingencies in this paper. A new method, called critical node detection, is introduced for selecting contingencies consisting of failures on buses. Besides these methods, we include an interdiction model which provides the worst case contingency selection. Our measurement for contingency evaluation is to maximize the social benefit, or to minimize the generating and load shedding cost. Comparing with other measurements for contingency selection, our model is based on economic analysis and is reasonable for evaluating the selected contingency state. Additionally, a contingency consisting of both buses and lines is also studied.
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Abbreviations
- I::
-
set of buses, including substations, generators and load consumers
Let \(\mathbf{1}^{g}_{i}\) for i∈I be the indicator such that \(\mathbf {1}^{g}_{i}=1\) if i is a generator, and \(\mathbf{1}^{g}_{i}=0\) otherwise
- (i,j)∈L::
-
power lines, i,j∈I
- N=(I,L)::
-
an undirected network representing a power grid where I is the set of buses/nodes and L is the set of power lines/edges
- D i ::
-
load at bus i
- \(\bar{F}_{ij}\)::
-
transmission capacity for line (i,j)∈L
- \(\bar{G}_{i}\)::
-
generation capacity at bus i∈I
- b ij ::
-
susceptance of line (i,j); b ij is computed from the resistance and the reactance of line (i,j)∈L
- h i ::
-
generation cost at bus i∈I
- r i ::
-
penalty cost for load-shedding at i∈I
- k::
-
the number of components (buses or lines) to be failed
- g i ::
-
power generation at node i∈I
- f ij ::
-
power flow on line (i,j)∈L
- s i ::
-
load shed at node i∈I
- θ i ::
-
phase angle at node i∈I
- δ i ::
-
δ i =1 if the bus i is selected as one of k components for failures; δ i =0 otherwise
- σ ij ::
-
σ ij =1 if the line (i,j) is selected as one of k components for failures; σ ij =0 otherwise
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This work was supported in part by the Defense Threat Reduction Agency through the grant BRCALL08-A-2-0030.
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Fan, N., Xu, H., Pan, F. et al. Economic analysis of the N−k power grid contingency selection and evaluation by graph algorithms and interdiction methods. Energy Syst 2, 313–324 (2011). https://doi.org/10.1007/s12667-011-0038-5
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DOI: https://doi.org/10.1007/s12667-011-0038-5