Hierarchical State Estimation in Power System by Modified Fast Decoupled State Estimation Method and System Decomposition

전력계통에서의 수정고속분할 추정법과 계통분할에 의한 계산적 장웅추정에 관한 연구

This paper describes a method for the state estimation by a modified fast decoupled estimation method and system decomposition. The state values are gained by using the weighted least square estimation method, fast decoupled estimation method, and modified fast decoupled estimation method. The estimated values of each method were compared about effectiveness of state values, respectively. This paper investigated the effects of impedance of well-condition or ill-condition into lines. The characteristics of state estimation were gained through hierarchical state estimation. Each method was applied to three model power systems, and, the results of test for the proposed method are given.