Domination in Graphs Applied to Electric Power Networks

  • Authors:
  • Teresa W. Haynes;Sandra M. Hedetniemi;Stephen T. Hedetniemi;Michael A. Henning

  • Affiliations:
  • -;-;-;-

  • Venue:
  • SIAM Journal on Discrete Mathematics
  • Year:
  • 2002

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Abstract

The problem of monitoring an electric power system by placing as few measurement devices in the system as possible is closely related to the well-known vertex covering and dominating set problems in graphs. We consider the graph theoretical representation of this problem as a variation of the dominating set problem and define a set S to be a power dominating set of a graph if every vertex and every edge in the system is monitored by the set S (following a set of rules for power system monitoring). The minimum cardinality of a power dominating set of a graph G is the power domination number $\gamma_P(G)$. We show that the power dominating set (PDS) problem is NP-complete even when restricted to bipartite graphs or chordal graphs. On the other hand, we give a linear algorithm to solve the PDS for trees. In addition, we investigate theoretical properties of $\gamma_P(T)$ in trees T.