Transient Stability Enhancement in Microgrids:: Critical Clearing Time Assessment for Sequential Symmetrical and Asymmetrical Faults with PSS-SVC Coordination

Siradj Younes; Sid Ahmed  Tadjer; Fathia Chekired

doi:10.51646/jsesd.v14i1.478

Authors

Siradj Younes Electrification of Industrial Enterprises Laboratory, University of Boumerdes, Boumerdes 35000, Algeria.
Sid Ahmed Tadjer Electrification of Industrial Enterprises Laboratory, University of Boumerdes, Boumerdes 35000, Algeria.
Fathia Chekired Unité de Développement des Équipements Solaires, UDES, Centre de Développement des Energies Renouvelables, CDER, Bou Ismail, Tipaza 42415, Algeria.

DOI:

https://doi.org/10.51646/jsesd.v14i1.478

Keywords:

Sequential faults, Transient stability, CCT, PSS-SVC, PV-Wind.

Abstract

The widespread integration of renewable energy sources, such as photovoltaic (PV) and wind power, poses significant challenges to power system stability. This study investigates the combined effect of a Power System Stabilizer (PSS) and a Static Var Compensator (SVC) in enhancing transient stability during sequential symmetrical and asymmetrical faults. A modified IEEE 9-bus system was used, with PV arrays connected to Buses 5 and 6 and a wind farm integrated at Bus 8. Simulations were conducted using ETAP 20.2, with Critical Clearing Time (CCT) calculated and frequency/voltage variations analyzed.

The results demonstrate that the coordinated use of PSS and SVC significantly improves system stability, increasing CCT values and damping critical oscillations. The system showed enhanced resilience to sequential faults, providing practical solutions for renewable energy integration challenges. The key conclusion is that PSS-SVC coordination effectively enhances the flexibility of power systems under high renewable energy penetration.

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