Using the Voltage Stability Index, P-index to Improve the Voltage Stability in Reactive Power Sharing Among DG Sources in the Islanded Microgrid

Document Type : Original Article

Authors

1 PhD student, Department of Electrical Engineering, Shahrekord University, Shahrekord, Iran

2 Associate Professor, Department of Electrical Engineering, Shahrekord University, Shahrekord, Iran

Abstract

Microgrids in island mode are controlled by active and reactive power control methods of distributed production sources. This paper presents a scheme for sharing reactive power among distributed generation sources in a multi-bus radial microgrid. A common method for sharing and controlling reactive power among distributed generation sources is the common drop method. Since the use of the drop method is due to the different voltage drops that it creates on the impedance of the lines of distributed production units. This causes reactive power to be distributed correctly through this method. As a solution to this problem, this study uses two methods, constant Q and virtual impedance, to share reactive power among distributed generation sources in order to eliminate voltage drop while sharing reactive power. The effect of distributed generation units on voltage regulation can be positive or negative, and this depends on the distribution system, the characteristics of distributed generation units, and their installation location. In this study, it has been tried to share power among distributed generation sources in such a way as to improve the stability of the network voltage, for this purpose, the stability index P-index has been used. Also, the effect of load changes on reactive power distribution among distributed generation sources, voltage profile index and calculation of system losses are also presented. In this article, an island microgrid with 38 IEEE standard buses is used.

Keywords

Main Subjects

References

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Tabriz Journal of Electrical Engineering
Volume 55, Issue 2 - Serial Number 112
October 2025
Pages 223-232

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