Coordinated voltage control in MV and LV distribution networks with inverter-interfaced users

In the last years there has been a progressive growing of distributed generators connected to the LV distribution networks, leading to possible depletion of power quality levels. For this reason, standards and grid codes are under revision and several studies have been conducted investigating the possibilities offered by grid connected inverter-interfaced generators to participate to network voltage regulation and unbalance correction. In this paper a control strategy is proposed applicable to a DMS coordinating the MV network regulation, applied through a novel adaptive regulation area criterion, with local LV network controllers which, in turn, coordinate the downstream inverter-interfaced generators. The aim is to demonstrate the benefits coming from a correct coordination of the distributed LV resources with the DMS located at the primary substation.