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Analysis and compensation of voltage unbalance of a DFIG using predictive rotor current control

Lookup NU author(s): Dr Van-Tung Phan, Dr Thillainathan Logenthiran, Dr Wai Lok Woo, Dr Dave Atkinson, Professor Volker Pickert

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Abstract

This paper analyzes the unbalance problem of a stand-alone doubly-fed induction generator (DFIG) under unbalanced loads and proposes a compensation method to balance the stator output voltage. The proposed compensation method is developed based on a predictive current control (PCC) method implemented in the rotor current controller. The development of the PCC is based on the discrete model of the DFIG to predict an appropriate average rotor voltage vector to eliminate the rotor current error in the following switching period. The identified rotor voltage vector is then applied to the rotor-side converter (RSC) by using space-vector modulation (SVM) with constant switching frequency. To improve the control performance, a compensation method for time delay based on the prediction of the future rotor current at the end of current sampling period also is investigated. The proposed control scheme was tested by experiments with 2.2 kW DFIG to demonstrate its excellent steady-state performance as well as extremely fast dynamic response.

Publication metadata

Author(s): Phan VT, Logenthiran T, Woo WL, Atkinson D, Pickert V

Publication type: Article

Publication status: Published

Journal: International Journal of Electrical Power & Energy Systems

Year: 2016

Volume: 75

Pages: 8-18

Print publication date: 01/02/2016

Online publication date: 08/09/2015

Acceptance date: 28/08/2015

ISSN (print): 0142-0615

ISSN (electronic): 1879-3517

Publisher: Elsevier

URL: http://dx.doi.org/10.1016/j.ijepes.2015.08.020

DOI: 10.1016/j.ijepes.2015.08.020

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