An Approach of State Estimation Based on Process Measurement Data

Began with a brief introduction of the basic principle and structure of SCADA system, this paper analyses the 3 practical problems exist in traditional state estimation, which is based on an isolated time section. It also points out that the problems cannot be eliminated by directly revising the existing algorithm and hence a new method of state estimation should be found from the methodology. On this basis, an approach of state estimation using process measurement data is proposed in this paper. The fundamental idea of the method includes two steps; the first one is to construct a relatively precise operation section with the process measurement data of SCADA system by utilizing the longitudinal relations of each measurement. The second step is to carry out the WLS state estimation, by which the transverse relations between different measurement data of the constructed time section are used. Theoretical analysis and testing scenario show that the method has great advantages over the traditional one in bad data identification and result accuracy improving. At the same time, the process measurement data using method in this paper provides a reference for making full use of the data in SCADA system, even in future WAMS.