Cluster Analysis of Distribution Grid Company Electric Networks Based on the Observation of Their Elements in Normal Mode
The purpose of the intermediate stage of work was to conduct a cluster analysis of the networks of the studied object to assess the degree of observability of existing objects and possible connections. To conduct cluster analysis, the daily consumption was initially calculated based on the energy balance data followed by the determination of the instantaneous values of active power. For 35-110 kV overhead lines of the studied networks, the error of the calculated values obtained with the data transmitted via telemechanics channels was determined. The third necessary parameter for conducting cluster analysis was the degree of observability, which was also initially calculated for each 35-110 kV substation line, and then the average value was determined taking into account the outgoing feeders for each substation. Based on the obtained parameters, a three-dimensional graph was constructed of the dependence of the mode calculation error on the degree of observability and the number of feeders and the projection of this graph. This projection had the form of lines of the level of error values. Each area corresponded to a certain error interval. These areas were the clusters. The constructed diagram allows us to determine the degree of observability, knowing the number of outgoing feeders and setting the desired error range. This information allows us to design the technical task to equip the telemechanics equipment of the designed facility based on the existing level of observability of networks. The conducted cluster analysis makes it possible both to set a certain level of observability for prospective connection and to assess the existing level of networks. Clusters clearly demonstrate the level of observability depending on the number of outgoing lines, while the compilation of a cluster analysis reveals the lack of observability of some substations.