A Power System State Estimation Technique in Consideration of Network Topology

In this paper, a new method is proposed for network topology identification in power systems. The proposed method is based on tabu search (TS) and state estimation with the L₁-norm. The North American blackout occurred in August 2003 brings about a new aspect that topology identification plays a key role in security control. This paper introduces the Boolean algebra into state estimation to deal with topological state. That allows power system operators to carry out reliable state estimation in a sense that network topology is identified while estimate is evaluated. In this paper, the mathematical formulation may be expressed as a nonlinear mixed integer programming problem. To solve it, this paper makes use of TS and the L₁-norm state estimator. TS is useful for solving a combinatorial optimization problem efficiently. The L₁-norm estimator gives a reliable solution as a robust state estimation method. The proposed method is successfully applied to the IEEE 14-node and 57-node systems.