Combined low voltage ride through and power smoothing control for DFIG/PMSG hybrid wind energy conversion system employing a SMES-based AC-DC unified power quality conditioner

•A SMES-based AC-DC UPQC is proposed for the use in DFIG/PMSG hybrid WECS.•The AC-DC UPQC can improve the LVRT capability of DFIG and PMSG simultaneously.•The AC-DC UPQC suits to smooth the total output power of DFIG and PMSG.•A cost-effective step-shaped SMES magnet assembly is designed. An Interli...

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Bibliographic Details
Published in:International journal of electrical power & energy systems 2021-06, Vol.128, p.106733, Article 106733
Main Authors: Jin, Jian Xun, Yang, Ruo Huan, Zhang, Run Tao, Fan, Ying Jun, Xie, Qi, Chen, Xiao Yuan
Format: Article
Language:English
Subjects:
Doubly fed induction generator
Dynamic voltage restorer
Low voltage ride through
Superconducting magnetic energy storage
Unified power quality conditioner
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Summary:•A SMES-based AC-DC UPQC is proposed for the use in DFIG/PMSG hybrid WECS.•The AC-DC UPQC can improve the LVRT capability of DFIG and PMSG simultaneously.•The AC-DC UPQC suits to smooth the total output power of DFIG and PMSG.•A cost-effective step-shaped SMES magnet assembly is designed. An Interline AC-DC unified power quality conditioner (UPQC) protection device is proposed and designed based on superconducting magnetic energy storage (SMES) in this paper to improve low voltage ride through (LVRT) capacity and smooth output power for doubly fed induction generator (DFIG)/ permanent magnet synchronous generator (PMSG) hybrid wind energy conversion system (WECS). The AC side of the proposed UPQC is connected in series with the terminal of DFIG as a dynamic voltage restorer (DVR), and the DC side of the UPQC is connected in parallel with the DC bus of PMSG for DC bus voltage maintenance and output power adjustment. For a case verification, a 4.76-H/1760-A superconducting coil (SC) is designed as an energy storage device utilized in UPQC to carry out the energy conversion. Finally, the performances of the proposed protection scheme under the conditions of wind speed variation, three-phase-to-ground fault and two-phase-to-ground fault have been presented and analyzed via simulation, to verify the effectiveness of the proposed AC-DC UPQC in DFIG/PMSG hybrid WECS.
ISSN:0142-0615
1879-3517
DOI:10.1016/j.ijepes.2020.106733