Redefinition of Transient Stability Boundaries for Overcurrent Relay Settings in Multi-Machine Power Systems with VSG Penetration

Adi Soeprijanto, Ardyono Priyadi, Dimas Fajar Uman Putra, Dani Irfani, Ony Asrarul Qudsi, Naoto Yorino

Abstract


VSG penetration can affect transient stability in power systems. CCT is the time limit set in OCR to isolate faults and serves as the boundary for power system stability during disturbances. VSG penetration may alter the CCT value, necessitating careful consideration of whether the OCR settings align with system stability boundary. This paper proposes a CCT calculation using the CT method due to VSG penetration. CT is determined through a numerical iteration process based on critical synchronization conditions due to VSG penetration in the power system. This method is sufficiently accurate for CCT calculation in complex systems. VSG penetration is modeled into a multi-machine system to provide a comprehensive view of transient stability. Subsequently, CCT is used as a boundary redefinition for OCR settings. Finally, an investigation is conducted on a modified IEEE 30-bus system, showing changes in transient stability boundary due to VSG penetration, indicating that OCR settings must be adjusted according to stability requirements to ensure the system remains stable after fault clearance. Quantitative validation shows that the proposed modified CT-based approach achieves an accuracy of 99.98% when compared with time-domain simulation–based reference results, demonstrating its high reliability in estimating the transient stability boundary.


Keywords


VSG; Transient Stability; CCT; Critical Trajectory; OCR setting

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References


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DOI (PDF): https://doi.org/10.20508/ijsmartgrid.v10i1.719.g422

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