A planning method based on total supply capability for active distribution network

Most urban distribution networks in China are now characterized by limited construction land and low load growth. This paper proposes a planning method that considers the total supply capability (TSC), which can enhance the efficiency of active distribution network. Firstly, the TSC planning method is introduced from two perspectives: planning measures and planning processes. Secondly, a model for load and distribution generation (DG) allocation is established, ensuring the maximum accommodation of load under the premise of all DG allocation. If there is any load or DG that cannot be connected, the corresponding feeder capacity is increased, and the problem is resolved until all loads are connected. Thirdly, balancing of the feeder netload is conducted to further optimize the planning scheme. In addition, the location of new loads and DGs is concurrently considered for the first time, aligning more closely with the practical need of urban networks with multiple feeders sharing the same path. Finally, case study is conducted to verify the effectiveness of the proposed planning method. Compared to existing method, the proposed method prioritizes utilizing the distribution network's power supply potential through TSC calculations, which delays the upgrade of substation main transformers and feeders.