Finite Position Set-Phase Locked Loop for Sensorless Control of Direct-Driven Permanent-Magnet Synchronous Generators

• Published in: IEEE transactions on power electronics Vol. 33; no. 4; pp. 3097 - 3105
• Main Authors: Abdelrahem, Mohamed, Hackl, Christoph M., Kennel, Ralph
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.04.2018; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Back electromotive force; Cost function; Electromotive forces; Finite control set-model predictive control (FCS-MPC); Generators; Permanent magnets; permanent-magnet synchronous generator (PMSG); phase locked loop; Phase locked loops; Phase locked systems; Position sensing; Predictive control; Robust control; Rotors; Sensorless control; Synchronous generators; variable-speed wind turbines; Wind turbines
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2017.2705245

This paper presents a novel finite position set-phase locked loop (FPS-PLL) for sensorless control of surface-mounted permanent-magnet synchronous generators (PMSGs) in variable-speed wind turbines. The proposed FPS-PLL is based on the finite control set-model predictive control concept, where a finite number of rotor positions are used to estimate the back electromotive force of the PMSG. Then, the estimated rotor position, which minimizes a certain cost function, is selected to be the optimal rotor position. This eliminates the need of a fixed-gain proportional-integral controller, which is commonly utilized in the conventional PLL. The performance of the proposed FPS-PLL has been experimentally investigated and compared with that of the conventional one using a 14.5 kW PMSG with a field-oriented control scheme utilized as the generator control strategy. Furthermore, the robustness of the proposed FPS-PLL is investigated against PMSG parameters variations.