Substation data validation

The problem of measurement error detection and correction in power-system substations or groups of substations is considered. It is shown that, by formulating the problem as a linear program, an efficient automatic solution is obtained which can reject erroneous power measurements and switch indications by taking into account redundant information together with natural circuit laws. The location and degree of inaccuracy of erroneous data are also obtained automatically. Computational examples are given which show that the processor time and storage requirements are very modest. The technique is therefore suitable for application in micro- or minicomputer systems located at substations and may be regarded as a prefiltering and data concentration phase for full-scale topology determination and state estimation at computer control centres.