TITLE:
Influence of Distributed Generation Injection on Voltage Stability in the Distribution Network and Its Application Technique
AUTHORS:
Seraphin Kasemuana Matototo, Christian Kayembe Mudimbilayi, Vinny Loemba Vang-Si, David Kanyinda Lumbala
KEYWORDS:
Distributed Generation, Voltage Stability, PV Curve, QV Curve, Modal Analysis, IEEE 9-Bus System, Eigenvalue, Participation Factor, MATPOWER
JOURNAL NAME:
Open Journal of Applied Sciences,
Vol.16 No.8,
August
27,
2026
ABSTRACT: This paper presents an analytical approach to evaluate the impact of distributed generation (DG) on the voltage stability of distribution systems. PV and QV modal analyses are used to identify the optimal bus location for DG integration to improve the network stability and the voltage profile. The IEEE 9-bus test system was used as a case study and was simulated in MATPOWER 7.1 in MATLAB 2017a. The Jacobian-based modal approach was also used to identify critical eigenvalues and bus participation factors, indicating the most sensitive nodes for voltage instability. Two photovoltaic distributed generation scenarios, corresponding to 10 MW and 20 MW installations, were investigated to evaluate their impact on voltage stability and network performance. The results indicate that PV/QV modal analysis is a simple yet effective technique for determining the optimal placement of DG in small- and medium-sized distribution networks.