Topology Identification of Distribution Network Considering Radial Bus Connection Characteristics

The existing topology identification schemes of distribution networks usually require comprehensive system parameters or data difficult to acquire; or the schemes may lead to an inaccurate topology such as looped or split topologies. The inaccurate topology information will lead to misleading control signals, making the distribution network easy to cross the stability boundary and collapse. To solve these issues, this paper explores a novel topology identification scheme of distribution networks based on historical voltage data. First, the distribution network model and the correlation of nodal voltages is analyzed. The nodal voltage correlation problem is then transformed to a lasso problem, whose solution provides neighbor sets of individual buses. Second, to get the accurate bus connection, a novel update strategy of neighbor set considering the local structural characteristics of the distribution network is proposed. Third, to identify the distribution network topology that conforms to the radial structure, an improved OR rule for branch recovery is proposed. The improved OR rule is used to recover the branch based on the updated neighbor set, which can effectively avoid the closed-loop or split situation of the identified topology. Finally, experimental results confirm the feasibility and effectiveness of the proposed scheme.