Evaluation of Voltage Stability Assessment Methodologies in Modern Power Systems with High Penetration of Inverter-Based Resources

Voltage stability concerns with the ability of an electrical power system to maintain acceptable voltage levels at all buses, whenever a disturbance occurs. To date, the definition and the classification of the types of study of voltage stability have not changed. Several reports on voltage stability have been published in the last decades by CIGRE and IEEE, e.g. CIGRE Technical Brochures 91, 128, 231, and 504, and IEEE Technical Report 90TH0358-2) and a more recent one on the contribution of distributed energy resources to system stability (IEEE Technical Report PES -TR22). These valuable references cover the fundamentals of available indices, analysis methods, and industry experience on voltage stability assessment in conventional systems dominated by synchronous generators.