A Framework for evaluating possible contribution from integration of storage units in a centralised voltage control system for active MV distribution networks

In recent years several studies regarding optimal operation of distribution networks in presence of Distributed Generation (DG) were proposed. This paper describes an algorithm developed by RSE ("DISCoVER") to increase the hosting capacity of the network by means of Voltage control Medium Voltage feeders in presence of storage units. The algorithm is based on an AC Optimal Power Flow (OPF) where losses and integral constraints are taken into account. Starting from forecasted load and generation, and technical constraints and dispatching costs for active and for reactive power, the algorithm generates for each time period a set of commands for controllable resources that guarantees achievement of technical goals minimizing the overall dispatching cost. The paper describes the general problem and how different resources are managed by the algorithm with respect to their technical and economic features. In order to evaluate possible contribution of storage units, different load and generation scenario were considered. First results achieved from simulation activity on the test network (based on a real MV grid) are given.