Comparative Analysis of Distributed Generation Control Methods to Enhance DG Penetration in Power Distribution Grids

This paper explores the utilization of alternative measures at the distribution grid level., particularly focusing on local voltage support through reactive power regulation., to identify optimal operating conditions for enhancing Distributed Generation (DG) capacity. To address the challenge posed by the substantial increase in interconnection requests faced by utilities., largely due to the installation of new photovoltaic (PV s) systems on their distribution grids., one viable strategy involves implementing voltage control measures directly by distributed generators. This includes actions such as the absorption of reactive power by DG inverters. A range of possibilities exist., most commonly using an active power dependent reactive power characteristic or using a voltage dependent reactive power characteristic. Different operation scenarios have been examined considering all extreme states of operation of the distribution system. The study is applied for a distribution feeder of a BV IMV substation of the Greek Distribution System with high levels of installed DG capacity. The results of the analysis indicate that the coordinated voltage controls could significantly increase DG hosting capacity without the need of costly grid reinforcements. The technical and economic benefits and challenges associated with such control techniques are discussed and evaluated.