Abstract
This paper enhances the observability of power networks by taking into consideration random component outages. The architecture of wide-area measurement system (WAMS) is analyzed in order to identify components that would affect the network observability. An iterative framework is devised to calculate a bus index in power networks equipped with phasor measurement units (PMUs) and conventional measurements. The average of bus indices represents a system index which provides an overall insight on the power network observability. The system index is utilized as a criterion to distinguish among multiple optimal PMU placements. Conventional bus injection and line flow measurements and the effect of zero-injection buses are considered in the proposed model. The numerical analyses are carried out for the proposed model and the results are discussed in detail.
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Abbreviations
- APO :
-
Average probability of observability
- A ij :
-
Probability of observability of bus i with PMU at bus j
- \(A_{ij}^{\mathit{Cm}}\) :
-
Availability of current measurement at line ij
- \(A_{ij}^{\mathit{CT}}\) :
-
Availability of CT at line ij
- \(A_{ij}^{\mathit{FM}}\) :
-
Availability of conventional flow measurement at line ij
- \(A_{i}^{\mathit{{IM}}}\) :
-
Availability of conventional injection measurement at bus i
- \(A_{ij}^{\mathit{Line}}\) :
-
Availability of line ij
- \(A_{i}^{\mathit{Link}}\) :
-
Availability of communication link for PMU at bus i
- \(A_{i}^{\mathit{PMU}}\) :
-
Availability of PMU at bus i
- \(A_{i}^{\mathit{PT}}\) :
-
Availability of PT at bus i
- \(A_{i}^{\mathit{Vm}}\) :
-
Availability of voltage measurement at bus i
- a ij :
-
Binary connectivity parameter between buses i and j
- b ij :
-
Binary parameter of flow measurement at line ij
- D i :
-
Difference of PO i in the last two iterations
- f i :
-
Observability function of bus i
- I :
-
Set of buses
- i,j,k:
-
Indices of bus
- N b :
-
Number of buses
- PO i :
-
Probability of observability of bus i
- u i :
-
Binary decision variable that is equal to one if PMU is installed at bus i and zero otherwise
- x ij :
-
Binary variable; 1 denotes bus i is made observable through the observability of bus j and flow measurements on line ij
- \(\bar{x}_{ij}\) :
-
Auxiliary binary variable; 1 when x ij =1 and u j =0
- y ij :
-
Binary variable; 1 denotes bus i is made observable through the zero-injection effect of bus j
- \(\bar{y}_{ij}\) :
-
Auxiliary binary variable; 1 when y ij =1, x ij =0, and u j =0
- z i :
-
Binary parameter of zero-injection bus i or the injection measurement at bus i
- γ :
-
System observability redundancy index (SORI)
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Aminifar, F., Fotuhi-Firuzabad, M., Shahidehpour, M. et al. Observability enhancement by optimal PMU placement considering random power system outages. Energy Syst 2, 45–65 (2011). https://doi.org/10.1007/s12667-011-0025-x
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DOI: https://doi.org/10.1007/s12667-011-0025-x