A Novel Sequence-phase Coupled Model for Active Distribution Network based on Modelica

The analysis of active distribution networks is the basis of Energy Internet control and management. As the penetration of distributed renewable energy into distribution networks has increased, traditional applications, such as OpenDSS, are not suitable for analyzing networks that contain distributed generators (DGs). For distribution network calculation, three-phase DGs are often modeled in sequence frame, while the three-phase unbalanced distribution networks are usually modeled in phase frames. Hence, this paper represents a novel model that could deal with both frames by load flows in a sequence-phase coupled frame. The steady state analysis model presented in this paper is implemented using an open source language called Modelica. Tests on the IEEE testing systems are carried out and the results demonstrate the advantage of the model.