Improved BGLL Algorithm for Distribution Network Zoning Considering Reactive Power Margins

The distribution network partitioning step is pivotal to zonal reactive power optimization. A rational partitioning strategy is essential to enhance reactive power regulation capability. The BGLL partitioning method, founded on complex network theory, utilizes modularity as an index, facilitating precise identification of the degree of inter-area coupling. As the complexity of grid operation increases, ensuring sufficient reactive power regulation capability in the partitioning becomes imperative. In this paper, the initial partitioning strategy based on reactive equipment is designed; The reactive power margin is introduced as a constraint to ensure that each region has sufficient regulation capability. For the low efficiency of node traversal of the BGLL algorithm, the node importance is introduced by using the electrical distance as a weight matrix. The mechanism of ordering the importance of the reactive sources and loads according to the dual node importance is optimized to optimize the node traversal process of the BGLL algorithm. At the same time, this optimization avoids the formation of unreasonable partitions that do not contain reactive devices. A case study on the IEEE-33 and IEEE-69 bus system demonstrates that the proposed method enhances the reactive power margin of the partitions, while ensuring the integrity of modularity. It was also verified that under Scene with forecast output error fluctuations, the algorithm can still guarantee the robustness and effectiveness of the partitioning results.