NDLI: Improved Control of DFIG Systems During Network Unbalance Using PI

Content Provider	IEEE Xplore Digital Library
Author	Hu, J. He, Y. Xu, L. Williams, B.W.
Copyright Year	1982
Abstract	This paper presents a new control strategy for a doubly fed induction generator (DFIG) under unbalanced network voltage conditions. Coordinated control of the grid- and rotor-side converters (GSC and RSC, respectively) during voltage unbalance is proposed. Under an unbalanced supply voltage, the RSC is controlled to eliminate the torque pulsation at double supply frequency. The oscillation of the stator output active power is then compensated by the active power output from the GSC, to ensure constant active power output from the overall DFIG generation system. In order to provide precise control of the positive- and negative-sequence currents of the GSC and RSC, a current control scheme consisting of a proportional integral (PI) controller and a resonant (R) compensator is presented. The PI plus R current regulator is implemented in the positive synchronous reference frame without the need to decompose the positive- and negative-sequence components. Simulations on a 1.5-MW DFIG system and experimental tests on a 1.5-kW prototype validate the proposed strategy. Precise control of both positive- and negative-sequence currents and simultaneous elimination of torque and total active power oscillations have been achieved.
Sponsorship	IEEE Industrial Electronics Society
Starting Page	439
Ending Page	451
Page Count	13
File Size	2249545
File Format	PDF
ISSN	02780046
Volume Number	56
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Control systems Regulators Voltage control Torque control Pi control Proportional control Induction generators Rotors Frequency Stators wind energy Converter doubly fed induction generators (DFIGs) proportional integral (PI) plus resonant (R; PI–R) voltage unbalance
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Electrical and Electronic Engineering Computer Science Applications

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