Approach to Assessment and Analysis of Distribution-Transmission Network Interactions at Grid Supply Point

A probabilistic method has been proposed to study the interaction between the active distribution network and the transmission network at the grid supply point. The Monte Carlo method has been adopted to account for uncertainty arising from renewable energy generation. Subsequently, the probabilistic load flow has been run to identify all operating points in terms of active and reactive power. Following this, the operating envelope at the point of interaction (grid supply Point) is plotted in the P-Q plane using the convex hull method. Four types of load models (static, dynamic, and composite) have been considered to observe the importance of choosing a realistic load model and its influence on the operation envelope. The results show that the proposed method is highly efficient for creating the parameter space to assist with studying distribution–transmission network interactions at the interface point.