Dynamic Regionalization for Unbalanced AC-DC Hybrid Distribution Systems with a Distributionally Robust Guarantee against DG Uncertainty

Nowadays, decentralized organization has become the emerging characteristic for AC-DC hybrid distribution systems (DS) facilitated by modern power electronic and information & communication techniques. This urges the DS to drop the centralized power supplying mode. In substitution, the DS is divided and operated as several self-adequacy subnetworks. In this paper, a two-stage Wasserstein distributionally robust optimization (WDRO) framework is proposed to provide a dynamic regionalization strategy for unbalanced AC-DC hybrid DSs. First, a semi-definite programing-based three-phase dynamic regionalization strategy is proposed to determine dynamic inner boundaries of subnetwork. And, the regionalization strategy is realized through utilizing two emerging techniques, i.e., soft open points and phase switch devices. Then, considering the uncertainty of distributed generation, the WDRO model is developed to ensure self-adequacy operation of each subnetwork. Case studies on modified IEEE 33-bus and 141-bus AC-DC DSs verify the effectiveness of our proposed method for offering flexible regionalization, power loss reduction, imbalance mitigation and convergence reliability.