University of Mohaghegh Ardabili Journal of Operation and Automation in Power Engineering 2322-4576 14 1 2026 01 01 SSR Mitigation with a High Power PV Farm Based on Optimal Damping Controller Placement in Active and Reactive Control Loops 31 39 3700 10.22098/joape.2024.13109.2009 EN Mahsa Khayyatzadeh Faculty of Electrical Engineering, Sahand University of Technology, Tabriz, Iran. Rasool Kazemzadeh Faculty of Electrical Engineering, Sahand University of Technology, Tabriz, Iran. Journal Article 2023 09 13 With the rapid increase in high penetration photovoltaic (PV) power generation systems into power systems around the world, the idea of power system oscillation mitigation with auxiliary control of PV plant has been suggested recently. In this study, the optimal control of a high penetration PV solar farm in sub-synchronous resonance (SSR) mitigation will be explored. The main contribution of the paper is designing a conventional sub-synchronous resonance damping controller (SSRDC) by properly choosing the best place in the active and reactive controllers of PV farm to place the sub-synchronous damping controller to achieve the best damping in various conditions. Also, the paper presents a complete dynamic model tailored to study via eigenvalue analysis, SSR events in the presence of a high penetration PV farm, and a systematic procedure to design a damping controller using Whale Optimization Algorithm (WOA). The results are validated through two case studies based on the IEEE first and second benchmark model for sub-synchronous resonance studies in MATLAB/Simulink and the achieved numerical results are thoroughly discussed. https://joape.uma.ac.ir/article_3700_d1e1859ad0e64d56174e3fbf81a83e2d.pdf