Strength assessment of electric power systems containing inverter-based distributed generation

•The concept of network response short circuit ratio (NRSCR) is proposed to evaluate the system strength of power systems with high penetration of inverter-based distributed generation (IBDG).•System interaction problem amongst IBDG is formulated using the inherent structural characteristics of powe...

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Bibliographic Details
Published in:Electric power systems research 2022-06, Vol.207, p.107825, Article 107825
Main Authors: Sanni, Shereefdeen Oladapo, Akorede, Mudathir Funsho, Olarinoye, Gbenga Abidemi
Format: Article
Language:English
Subjects:
Distributed generation
Electric power distribution
Electric power systems
Electricity distribution
Electricity generation
Inverter-based distributed generation
Inverters
Power flow
Power transfer
Renewable energy
Short circuit ratio
Short circuits
Solar energy
Structural characteristics
System strength
Voltage stability
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Summary:•The concept of network response short circuit ratio (NRSCR) is proposed to evaluate the system strength of power systems with high penetration of inverter-based distributed generation (IBDG).•System interaction problem amongst IBDG is formulated using the inherent structural characteristics of power systems.•This new approach adequately evaluates system strength based on comparative results with existing system strength evaluation methods.•NRSCR simplifies the system strength computation process without inverting the system's Ybus matrix or solving the power flow problem. Large-scale penetration of inverter-based distributed generation (IBDG) systems such as wind and solar PV plants into conventional power systems is raising concerns for traditional methods of power system operation and control. System strength at the point of interconnection (PoI) of the IBDG is one such concern, measured by the short circuit ratio (SCR). However, SCR and other SCR-based methods disregard interactions and electrical connections that exist amongst IBDGs. This study proposes an alternative method using the theory of power system network structural characteristics. The network response short circuit ratio (NRSCR) method captures the interaction among IBDGs and with nearby synchronous generators without having to solve the power flow problem. In addition, it does not require inversion of the systems’ admittance matrix. Comparative analysis of the proposed method with other SCR-based methods is demonstrated by showing the relationship between system strength, voltage stability, and active power transfer.
ISSN:0378-7796
1873-2046
DOI:10.1016/j.epsr.2022.107825