Study on Voltage Regulation Measures of Distribution Lines by Implementation of a Interconnection Device for Photovoltaic System

This paper presents a voltage-regulation method for distribution lines using photovoltaic (PV) output control via a supplementary interconnection device. The characteristics of distributed generation (DG) inverters connected to distribution networks have evolved through three generations. First-generation inverters lack output-control functions and cannot regulate voltage during normal operation. To mitigate the adverse voltage impacts of DG on distribution feeders, this study proposes a method to control the PV output current injected into the distribution line through the interconnection device. Active-power control was implemented by adjusting the inverter output via the device, and its effectiveness was validated through simulation studies. The results confirm that the proposed approach can achieve effective voltage regulation of distribution lines and enhance the hosting capacity of distributed generation systems.