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

Phan, Van-Tung, Logenthiran, Thillainathan, Woo, Wai Lok, Atkinson, Dave and Pickert, Volker (2016) Analysis and compensation of voltage unbalance of a DFIG using predictive rotor current control. International Journal of Electrical Power & Energy Systems, 75. pp. 8-18. ISSN 0142-0615

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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.

Item Type:	Article
Uncontrolled Keywords:	Doubly fed induction generator, Predictive current control, Wind turbine, Unbalanced load, Stand-alone DFIG, Voltage unbalance
Subjects:	H600 Electronic and Electrical Engineering
Department:	Faculties > Engineering and Environment > Computer and Information Sciences
Depositing User:	Paul Burns
Date Deposited:	03 Apr 2019 16:14
Last Modified:	10 Oct 2019 20:45
URI:	http://nrl.northumbria.ac.uk/id/eprint/38734

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