Identifying interaction boundary of inverter-based generation in assessing system strength of power grids using relative electrical distance concept
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Date
2024
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Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
The increasing use of inverter-based generation (IBG) in power grids raises concern about system strength. This is
partly due to the inherent interactions among multiple IBGs in close proximity to one another. This paper
proposes an approach to identifying the existential boundary of interaction in a network using the relative
electrical distance (RED) concept. The mathematical formulation of the RED concept to address the interaction
problem among the IBGs involved utilising the power system network’s admittance matrix to capture its
structural characteristics. An interaction matrix derived from the RED values of all IBG pairs was then developed
to identify the interacting IBG groups. The proposed approach was demonstrated using the IEEE 39-bus system
and a practical 72-bus Nigerian power grid. Results showed that RED values effectively group interacting IBGs,
with values closer to 0 signifying higher interaction levels, values closer to 1 indicating lower interaction, and a
value of 1 denoting no interaction. Time-domain simulations confirmed the accuracy of the approach, demonstrating
that the effect of control interaction propagates proportionally to neighbouring IBGs based on RED
values. However, fault currents can influence the impact of control interactions. This approach, which requires
less computational effort, provides a quick identification tool for potential areas of concern based on the degree
of interaction, enhancing the reliability of power grids with high IBG penetration.
Description
Keywords
Control interaction, Renewable energy, Interaction boundary, Inverter-based generation, Relative electrical distance (RED), Short circuit ratio, System strength