Comprehensive Analysis of Electrical Distribution Network Operation – An Approach of Electrical Load Modelling

The electrical distribution network operation depends considerably on network busloads, which are formed by active and reactive power of the substations. Therefore, the network operation variables such as power flows, currents, voltages, etc. change similarly as do loads. It is possible to notice periodicity, temperature dependency, stochasticity etc. This paper describes the distribution network monitoring methodology based on the mathematical model of load, i.e. in described approach, the network busloads are modeled using the mathematical model of load and afterwards, modeled load values in different conditions are used for network monitoring. Monitoring is understood as network operation forecasting, simulation, and analysis. Success of monitoring is guaranteed by an adequate mathematical model, which describes the changes of the load during the entire observable period, both in the past and in the future. The results, obtained through network monitoring process could be used for longand short-term planning and dispatching, considering adequate changes in time, temperature dependency, probable deviations of the state variables etc. Based on the results it is possible to assess network operation and possible future scenarios and their effect on the network and apply appropriate solutions to enhance system reliability and security. An application of network analysis, modelling and estimation but also validation of results with real measurements obtained from real distribution network is presented. Key-Words: busloads, distribution network, mathematical model of load, load monitoring, network operation monitoring, SCADA, state estimation.