DATA VISUALIZATION AND IDENTIFICATION OF ANOMALIES IN POWER-SYSTEM STATE ESTIMATION USING ARTIFICIAL NEURAL NETWORKS

Bad data identification is one of the most important and complex probl ems to be addressed during power system state estimation, particularly when both analogical and topological errors (branch or bus misconfigu rations) are to be considered. The paper proposes a new method that is capable of distinguishing between analogical and topological errors, and also of identifying which are the bad measurements or the misconfi gurated elements due to unreported or incorrectly reported line outage s, bus splits etc. The method explores the discrimination capability o f the normalised innovations (the differences between the latest acqui red measurements and their corresponding predicted quantities), which are used as input variables to an artificial neural network that provi des, in the output, the anomaly identification. Data projection techni ques are also used to visualise and confirm the discrimination capabil ity of the normalised innovations. The method is tested using the IEEE 24-bus test system, where several types of errors have been simulated , including single and multiple bad measurements, topology errors invo lving branches or buses etc.