NDLI: Dual sequence current controller without current sequence decomposition implemented on DSRF for unbalanced grid voltage conditions

Content Provider	IEEE Xplore Digital Library
Author	Sizhan Zhou Jinjun Liu Linyuan Zhou Hongwei She
Copyright Year	2014
Description	Author affiliation: State Key Lab. of Electr. Insulation & Power Equip., Xi'an Jiaotong Univ. Xi'an, Xi'an, China (Sizhan Zhou; Jinjun Liu; Linyuan Zhou; Hongwei She)
Abstract	Dual sequence current control is the key technique for grid-connected voltage source converter to ensure the performance or fulfill grid requirement under unbalanced grid voltage conditions. In this paper, after reviewing and analyzing the existing dual sequence current controller (DSCC), a simple DSCC is proposed based on double synchronous reference frame (DSRF) without the need of current sequence decomposition. The positive-sequence current is controlled in the positive SRF with a PI controller, while the negative-sequence current is controlled in the negative SRF only with an integrator controller. To avoid the ineffectiveness of the inductor current feed-forward (ICFF) decoupling technique in DSRF, only the decoupling components in the positive SRF is performed. This ensures the same performance with the conventional current controller under normal grid voltage conditions. Further, a new decoupling technique with reference current feed-forward can be optionally employed to provide decouple effect for both positive-sequence and negative-sequence current control. Simulation results will demonstrate the validity of the proposed DSCC.
Starting Page	60
Ending Page	67
File Size	2998170
Page Count	8
File Format	PDF
ISBN	9781479957767
DOI	10.1109/ECCE.2014.6953376
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-09-14
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Current control Transfer functions Power system stability Vectors Delays Voltage control Oscillators
Content Type	Text
Resource Type	Article

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