Non-Linear Dynamic Power System State Estimation

This paper describes the application of the invariant imbedding non-linear dynamic estimation technique to determine the transient state of a power system. The estimator handles system and measurement non-linearities effectively and works in the presence of system input disturbance and measurement noise. Off-line computer simulations of the estimator applied to a single machine infinite busbar power system successfully estimated the states of the machine. The results indicated that successful estimation is achieved by a careful choice of the input disturbance noise covariance matrix, Q. High Q values are recommended for the stepout region and low Q values for the hunting region.