THE IMPLICATIONS OF LOW SHORT-CIRCUIT CAPACITY ON THE STRENGTH OF POWER GRID: A NIGERIAN CASE STUDY
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Date
2023
Journal Title
Journal ISSN
Volume Title
Publisher
Faculty of Engineering and Technology
Abstract
The quest to integrate renewable energy sources (RES) into power grids arises from the need to adopt a
sustainable source of energy while achieving energy security. RES such as solar photovoltaic (PV) and wind
energy systems are also called inverter-based generators (IBGs) because of their inverter-interfaced connections
with the grid. The inverter's quick dynamic response and low short-circuit capacity (SCC) can cause distress to
the grid and potentially result in power system stability problems. This paper has assessed the SCC and system
strength of the Nigerian grid based on proposed IBG integrations in the northern part of the country. A shortcircuit
study was conducted, system strength was evaluated using the Network Response Short Circuit Ratio
(NRSCR), and a dynamic voltage stability analysis was performed. These studies revealed that most of the
proposed points on the grid have low SCC but suitable for the size of IBG integration; however, some identified
weak points may affect the stability of the grid. The results of this investigation provide valuable insights on the
impact of IBG integration in renewable energy-rich, SCC-deficient areas of a grid.
Description
Keywords
Renewable energy resources, Inverter-based generators, Short-circuit capacity, Solar PV, System strength, Wind energy system, Voltage stability