Holomorphic Embedding Load Flow Modeling of the Three-phase Active Distribution Network

With large-scale distributed generators (DGs) penetrated into the active distribution network (ADN), conventional load flow convergence failure is incurred by heavy power transmission. The Holomorphic Embedding Load Flow Method (HELM) has proven to be more robust than the Newton Raphson method under heavy power transmission and is not sensitive to the initial points. At present, HELM is mainly designed for balanced transmission networks. In this study, we developed a three-phase HELM model to accommodate DGs, delta connection loads, and ZIP loads for ADN. The effectiveness and better performance of the proposed method under heavy load situations were validated using modified unbalanced IEEE 13, 34, 37, and 123 test feeders..