Power system observability with minimal phasor measurement placement

Journal Article · Sat May 01 04:00:00 EDT 1993 · IEEE Transactions on Power Systems (Institute of Electrical and Electronics Engineers); (United States)

DOI:https://doi.org/10.1109/59.260810· OSTI ID:6002913

Baldwin, T L; Mili, L; Boisen, Jr, M B ^[1]; Adapa, R ^[2]

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1. Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States)
2. Electric Power Research Inst., Palo Alto, CA (United States)

This paper deals with the placement of a minimal set of phasor measurement units (PMU's) so as to make the system measurement model observable, and thereby linear. A PMU placed at a bus measures the voltage as well as all the current phasors at that bus, requiring the extension of the topological observability theory. This concerns the extension of the concept of spanning tree to that of spanning measurement subgraph with an actual or a pseudo-measurement assigned to each of its branches. The minimal PMU set is found through a dual search algorithm which uses both a modified bisecting search and a simulated annealing-based method. The former fixes the number of PMU's while the latter looks for a placement set that leads to an observable network for a fixed number of PMU's. In order to accelerate the procedure, an initial PMU placement is provided by a graph-theoretic procedure which builds a spanning measurement subgraph according to a depth-first search. From computer simulation results performed on various test systems it appears that only one fourth to one third of the system buses need to be provided with PMU's in order to make the system observable.

• OSTI ID: 6002913
• Journal Information: IEEE Transactions on Power Systems (Institute of Electrical and Electronics Engineers); (United States), Journal Name: IEEE Transactions on Power Systems (Institute of Electrical and Electronics Engineers); (United States) Vol. 8:2; ISSN ITPSEG; ISSN 0885-8950
• Country of Publication: United States
• Language: English

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