Suppressing output power fluctuation and improving FRT Capability of DFIG-based wind energy conversion system with SMES and dual-mode protection scheme

Kai Jian Du, Zi Xuan Zheng*, Xian Yong Xiao, Chun Jun Huang, Jie Ren, Xiao Yuan Chen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

As the grid codes of wind turbines note, doubly fed induction generator (DFIG)-based wind energy conversion system (WECS) should maintain uninterrupted operation during certain voltage faults. To meet the codes, a novel configuration of DFIG-based WECS is proposed in which a superconducting magnetic energy storage (SMES) and a series transformer are incorporated. The control strategies of the WECS are redesigned to smooth the output power fluctuations and ride through different levels of voltage faults. The grid-side converter (GSC) is controlled to smooth power fluctuations caused by random wind speeds under normal conditions. The GSC and protection circuit are controlled to switch into the series compensation mode to fully compensate the stator voltage during voltage swells and slight voltage sags. While under severe voltage sags, the protection circuit operates in the current limiting mode, which significantly limits the stator and rotor fault overcurrent, improves the stator voltage and supresses fluctuations of the electromagnetic torque. The different faults are applied, the simulation results demonstrate that the presented scheme can effectively smooth output power fluctuations and strengthen the voltage fault ride-through capability (FRT) of WECS.

Original languageEnglish
JournalIET Generation, Transmission and Distribution
Volume15
Issue number12
Pages (from-to)1820-1829
ISSN1751-8687
DOIs
Publication statusPublished - Jun 2021

Bibliographical note

Funding Information:
This work was supported by the National Natural Science Foundation of China under Grant No. 51907134.

Publisher Copyright:
© 2021 The Authors. IET Generation, Transmission & Distribution published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology

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