Topology Analysis of Distribution Network Based on μPMU and SCADA

The traditional topological analysis of distribution network usually uses the switch measurement data of supervisory control and data acquisition (SCADA) system. With the continuous expanding of distribution networks and the high penetration of distributed power sources, the distribution network topology changes frequently. In recent years, the application of micro-phasor measurement unit (μPMU) in distribution networks has drawn attention. Therefore, the collected data of the μPMU device is used to provide a basis for real-time topology analysis of the distribution network. Under this background, this paper presents a network topology analysis method based on μPMU and SCADA measurement data. When the value of the branch-current changes without uploading the switch data of the SCADA system, the data collected by the μPMU is used to further verify the correctness of the network topology obtained from the SCADA data. The maximum load transfer coefficient λmax is selected according to the actual power distribution system. Whether the branch-current root mean square (RMS) value measured by the real-time PMU meets the judgment basis is detected, when satisfied, a real-time node-branch association matrix Z is obtained by modifying the branch-switch matrix S. For the real-time node branch association matrix Z, the real-time network topology is obtained by the breadth-first search method (BFS) traversal. This ensures fast real-time status estimation and improves the accuracy of state estimation. Finally, the feasibility of the method is analyzed by the simulation of IEEE33-bus system.