Sub-synchronous oscillations (SSOs) in doubly-fed induction generator (DFIG)-based series compensated power systems are mainly caused by sub-synchronous control interaction (SSCI). SSCI is the most recently found type of sub-synchronous resonances. In this article, SSCI is elaborated and investigated by performing eigenvalue analysis on a mathematically modeled DFIG system. The occurrence of SSCI is observed and the results of eigenvalue analysis are validated through a down-scaled 7.5-kW experimental setup of a grid-connected DFIG. Based on the analysis, the proportional control parameters of the rotor-side converter (RSC) are found to be very sensitive towards the sub-synchronous modes of the system. The results obtained from both the simulation and the experimental analysis show that if the sensitive proportional parameters of the RSC are tuned properly, then the DFIG system can become immune to the SSCI for any level of series compensation.
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Manuscript received May 22, 2019; revised September 18, 2019 and November 13, 2019; accepted November 13, 2019. Date of publication November 18, 2019; date of current version May 20, 2020. This work was supported by the KTH SweGRIDS. Paper no. TEC-00572-2019. (Corresponding author: Muhammad Taha Ali.) M. T. Ali and M. Ghandhari are with the Department of Electric Power and Energy Systems, KTH Royal Institute of Technology, 11428 Stockholm, Sweden (e-mail: email@example.com; firstname.lastname@example.org).
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