Improvement of Voltage Regulation in an IEEE 9-Bus Radial Microgrid Feeder Using Regression Model

In this paper, an effort has been made to improve voltage regulation (VR) in a radial bus, typically used in a rural microgrid distribution network. As a case study example, an IEEE 9-bus radial feeder has been considered. The methodology uses a regression-based model that involves five input parameters for obtaining the voltage at a particular bus of the feeder. It has been seen that the addition of a suitable magnitude of leading reactive power at the last bus can improve the regulation. The object of this study is to analyze the impact of the magnitude of the injected reactive power that will improve the voltage regulation at the worst affected bus (the last bus), with voltage levels at other buses in acceptable limits. The study shows that although the injected VAR does help to improve the VR, the changes, however, are not very significant. Thus, a conclusion can be drawn that in IEEE 9-bus system, reactive compensation at the extreme bus is not the best solution to obtain appreciable voltage improvement in the system. The injection at other buses can be tried in seeking VR improvements