Dr. Omer Turksoy

This paper deals with the computation of all proportional-integral (PI)-based pitch controllers which achieve the desired frequency-domain specifications, namely, gain and phase margins (GPMs) of a large wind turbine (LWT) with communication delays. An efficient graphical method based on extracting the boundaries of stability regions in PI controller parameter space having user-defined GPMs has been employed to determine GPM-based stability regions for a wide range of time delays. The theoretical region boundaries are validated by using a powerful numerical method known as the quasi-polynomial mapping-based root finder (QPmR) and time-domain simulations. Results indicate that the proposed scheme gives an improved dynamic response compared to the recently developed scheme based on stability only for the pitch control of LWTs with communication delays.

21 March 2019 in Transactions of the Institute of Measurement and Control

Journal Article

Gain-phase margins-based delay-dependent stability analysis of pitch control system of large wind turbines

Omer Turksoy

Saffet Ayasun

Yakup Hames

Sahin Sonmez

This paper investigates the effect of gain and phase margins (GPMs) on the delay-dependent stability analysis of the pitch control system (PCS) of large wind turbines (LWTs) with time delays. A frequency-domain based exact method that takes into account both GPMs is utilized to determine stability delay margins in terms of system and controller parameters. A gain-phase margin tester (GPMT) is introduced to the PCS to take into GPMs in delay margin computation. For a wide range of proportional–integral controller gains, time delay values at which the PCS is both stable and have desired stability margin measured by GPMs are computed. The accuracy of stability delay margins is verified by an independent algorithm, Quasi-Polynomial Mapping Based Rootfinder (QPmR) and time-domain simulations. The time-domain simulation studies also indicate that delay margins must be determined considering GPMs to have a better dynamic performance in term of fast damping of oscillations, less overshoot and settling time.

About Me

Omer Turksoy received his B.S. and M.S. degrees in electrical and electronics engineering from Niğde University, Niğde, Turkey, in 2014 and 2016, and his Ph.D. degree in electrical and electronics engineering from Cukurova University, Adana, Turkey, in 2020. From 2014 to 2021, he was a Research Assistant with the Department of Electrical and Electronics Engineering at Iskenderun Technical University. From 2021 to 2023, he served as an Assistant Professor at the same institution. From 2023 to 2025, he worked as a Senior Calibration Engineer at AVL Research & Engineering Turkey, where he was involved in advanced calibration, control, and real-time implementation of inverter-based electric powertrain systems and battery management systems, including PIL/SIL/HIL validation and energy-efficient control strategies. Since 2025, he has been working as an Assistant Professor at Iskenderun Technical University. He is the author and coauthor of more than 20 journal articles and conference papers and has contributed to several academic and industrial research projects. His research interests include automatic voltage regulator systems, power electronics, electric vehicles, battery management systems, advanced and nonlinear control techniques, and metaheuristic optimization algorithms.

Dr. Omer Turksoy

Dr. Omer Turksoy

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About Me