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Stator Flux Based Model Reference Adaptive Observers for Sensorless Vector Control and Direct Voltage Control of Doubly-Fed Induction Generator

Nair, R and Narayanan, G (2020) Stator Flux Based Model Reference Adaptive Observers for Sensorless Vector Control and Direct Voltage Control of Doubly-Fed Induction Generator. In: IEEE Transactions on Industry Applications, 56 (4). pp. 3776-3789.

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Official URL: https://dx.doi.org/10.1109/TIA.2020.2988426


A position sensorless operation of a doubly-fed induction generator (DFIG) is desired from considerations of cost, maintenance, cabling, and reliability. This article proposes two stator flux based model reference adaptive observers (SF-MRAOs) for the estimation of the rotor speed and position in a stand-alone DFIG. The cross product of the reference and estimated stator flux linkage vectors is fed as controller input in the existing method, thereby, making the observer model nonlinear. The first proposed method, which is based on notch filtering, offers a performance comparable to that of the existing method while reducing the number of voltage and current sensors required. The second proposed method linearizes the error input to the controller, making the controller design straight forward, and also leading to superior performance than the existing methods. The linearized SF-MRAO is shown to work successfully with good dynamic performance in vector control of a stand-alone DFIG. This article also shows that the proposed linearized SF-MRAO can be employed for obtaining the rotor current angle in direct voltage control of a stand-alone DFIG. Simulation and experimental results are presented from a laboratory prototype of a 10-hp DFIG coupled to a squirrel-cage induction motor. The sensitivity of the performance of the proposed linearized SF-MRAO to variations in machine parameters is also studied theoretically and experimentally.

Item Type: Journal Article
Publication: IEEE Transactions on Industry Applications
Publisher: Institute of Electrical and Electronics Engineers Inc.
Additional Information: The copyright of this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords: Asynchronous generators; Controllers; Electric fault currents; Electric generators; Electric machine theory; Linearization; Model reference adaptive control; Notch filters; Sensitivity analysis; Sensorless control; Squirrel cage motors; Stators; Voltage control, Direct voltage control; Doubly fed induction generator (DFIG); Doubly fed induction generators; Dynamic performance; Model reference adaptive; Position sensorless operation; Sensorless vector control; Squirrel cage induction motor, Vector control (Electric machinery)
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Date Deposited: 02 Sep 2020 06:48
Last Modified: 02 Sep 2020 06:48
URI: http://eprints.iisc.ac.in/id/eprint/66428

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