I. Introduction
Electrical distribution systems are expected to accommodate large-scale DGs in the coming years because it is now widely accepted that DGs bring wide-range benefits to the system. In the companion paper, the main drivers, the challenges and the limitations of integrating large-scale DGs in distribution systems as well as the technical solutions ahead for alleviating the side-effects of such integration are presented. Distribution network systems (DNSs) are especially expected to be equipped with smart-grid enabling technologies that significantly enhance the scale of DGs integrated into the system (renewables, in particular) by substantially reducing their negative impacts so that the system integrity, stability and power quality are maintained at standard levels. To this end, it is highly required to coordinate DG integration planning with the deployment of different smart-grid enabling technologies such as reactive power sources, advanced switching and storage devices.