ASSESSMENT OF THE IMPACT OF DISTRIBUTION GENERATION ON RADIAL DISTRIBUTION NETWORK PROTECTION SYSTEM

Funso Ariyo; Samson Ayanlade; Ayooluwa Adeagbo; Abdulrasaq  Jimoh; Moses Adebayo

doi:10.4314/njt.v44i3.11

Authors

F. Ariyo Obafemi Awolowo University
S. Ayanlade Lead City University
A. Adeagbo Adeleke University
A. Jimoh Obafemi Awolowo University
M. Adebayo Obafemi Awolowo University

DOI:

https://doi.org/10.4314/njt.v44i3.11

Keywords:

Distribution generation, Overcurrent relay, Time multiplier setting, Plug multiplier setting, Voltage profile, Active and reactive power losses

Abstract

Distributed generation (DG) entails the integration of small-scale generators into the distribution level of power systems. While DG deployment enhances distribution network performance, it also presents challenges to protection systems. This study analyzes the impact of DG integration on the protection scheme of a radial distribution grid. The Dingo Optimization Algorithm (DOA) was implemented in MATLAB to determine the optimal placement and size of DG units aimed at minimizing active and reactive power losses and improving voltage profiles. The optimized network configuration obtained from MATLAB was then modeled in ETAP for detailed protection analysis to assess the influence of DG on overcurrent relay coordination. The base-case load flow revealed active and reactive power losses of 202.71 kW and 23.56 kVAr, respectively, which were reduced by 61.21 % and 57.6 % after optimal DG integration. The results show that while DG integration enhances voltage stability and minimizes technical losses, it also increases short-circuit current levels, thereby affecting relay operating times. In conclusion, adaptive protection coordination is essential to maintain system reliability in DG-integrated distribution networks.

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