Research on Operation Risk Perception of Distribution Network Based on State Estimation

Safe operation of distribution network is an important part of the safe operation of the whole power grid. It is also the key link to improve the operation level of the power supply system at present. The paper uses the load data of distribution automation system and load data in power information acquisition system as predictive variables, then combines power flow calculation to get branch current predictive value. The branch current predictive value is used as input of the state estimation filter step of distribution network to reduce the calculation time of state estimation. Considering the operation safety and reliability index of distribution network, a risk perception index system of distribution network operation is established. Reliability related index is calculated by reliability related data from production management system and power quality management system. Distribution network security related index is calculated by state estimation result. The operation state perception index of distribution network is calculated by analytic hierarchy process, and the state of distribution network is judged. Real-time perception of operational risk status of distribution network is realized. The validity of the algorithm is verified by the analysis of an example.