A novel transient rotor current control scheme of a doubly-fed induction generator equipped with superconducting magnetic energy storage for voltage and frequency support

doi:10.1088/1674-1056/24/7/070201

中国物理B ›› 2015, Vol. 24 ›› Issue (7): 70201-070201.doi: 10.1088/1674-1056/24/7/070201

• GENERAL • 下一篇

A novel transient rotor current control scheme of a doubly-fed induction generator equipped with superconducting magnetic energy storage for voltage and frequency support

沈阳武^a, 柯德平^a, 孙元章^a, Daniel Kirschen^b, 王轶申^b, 胡元朝^a

a School of Electrical Engineering, Wuhan University, Wuhan 430072, China;
b Department of Electrical Engineering, University of Washington, Seattle, Washington, USA

收稿日期:2014-10-10 修回日期:2015-01-28 出版日期:2015-07-05 发布日期:2015-07-05
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 51307124) and the Major Program of the National Natural Science Foundation of China (Grant No. 51190105).

A novel transient rotor current control scheme of a doubly-fed induction generator equipped with superconducting magnetic energy storage for voltage and frequency support

Shen Yang-Wu (沈阳武)^a, Ke De-Ping (柯德平)^a, Sun Yuan-Zhang (孙元章)^a, Daniel Kirschen^b, Wang Yi-Shen (王轶申)^b, Hu Yuan-Chao (胡元朝)^a

a School of Electrical Engineering, Wuhan University, Wuhan 430072, China;
b Department of Electrical Engineering, University of Washington, Seattle, Washington, USA

Received:2014-10-10 Revised:2015-01-28 Online:2015-07-05 Published:2015-07-05
Contact: Ke De-Ping E-mail:kedeping@whu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 51307124) and the Major Program of the National Natural Science Foundation of China (Grant No. 51190105).

摘要/Abstract

摘要： A novel transient rotor current control scheme is proposed in this paper for a doubly-fed induction generator (DFIG) equipped with a superconducting magnetic energy storage (SMES) device to enhance its transient voltage and frequency support capacity during grid faults. The SMES connected to the DC-link capacitor of the DFIG is controlled to regulate the transient dc-link voltage so that the whole capacity of the grid side converter (GSC) is dedicated to injecting reactive power to the grid for the transient voltage support. However, the rotor-side converter (RSC) has different control tasks for different periods of the grid fault. Firstly, for Period I, the RSC injects the demagnetizing current to ensure the controllability of the rotor voltage. Then, since the dc stator flux degenerates rapidly in Period II, the required demagnetizing current is low in Period II and the RSC uses the spare capacity to additionally generate the reactive (priority) and active current so that the transient voltage capability is corroborated and the DFIG also positively responds to the system frequency dynamic at the earliest time. Finally, a small amount of demagnetizing current is provided after the fault clearance. Most of the RSC capacity is used to inject the active current to further support the frequency recovery of the system. Simulations are carried out on a simple power system with a wind farm. Comparisons with other commonly used control methods are performed to validate the proposed control method.

关键词: doubly-fed induction generator, transient rotor current control, superconducting magnetic energy storage, voltage support

Abstract: A novel transient rotor current control scheme is proposed in this paper for a doubly-fed induction generator (DFIG) equipped with a superconducting magnetic energy storage (SMES) device to enhance its transient voltage and frequency support capacity during grid faults. The SMES connected to the DC-link capacitor of the DFIG is controlled to regulate the transient dc-link voltage so that the whole capacity of the grid side converter (GSC) is dedicated to injecting reactive power to the grid for the transient voltage support. However, the rotor-side converter (RSC) has different control tasks for different periods of the grid fault. Firstly, for Period I, the RSC injects the demagnetizing current to ensure the controllability of the rotor voltage. Then, since the dc stator flux degenerates rapidly in Period II, the required demagnetizing current is low in Period II and the RSC uses the spare capacity to additionally generate the reactive (priority) and active current so that the transient voltage capability is corroborated and the DFIG also positively responds to the system frequency dynamic at the earliest time. Finally, a small amount of demagnetizing current is provided after the fault clearance. Most of the RSC capacity is used to inject the active current to further support the frequency recovery of the system. Simulations are carried out on a simple power system with a wind farm. Comparisons with other commonly used control methods are performed to validate the proposed control method.

Key words: doubly-fed induction generator, transient rotor current control, superconducting magnetic energy storage, voltage support

中图分类号: (Control theory)

02.30.Yy

88.80.fj (Superconducting magnetic energy storage) 88.50.-k (Wind energy) 84.60.-h (Direct energy conversion and storage)

沈阳武, 柯德平, 孙元章, Daniel Kirschen, 王轶申, 胡元朝. A novel transient rotor current control scheme of a doubly-fed induction generator equipped with superconducting magnetic energy storage for voltage and frequency support[J]. 中国物理B, 2015, 24(7): 70201-070201.

Shen Yang-Wu (沈阳武), Ke De-Ping (柯德平), Sun Yuan-Zhang (孙元章), Daniel Kirschen, Wang Yi-Shen (王轶申), Hu Yuan-Chao (胡元朝). A novel transient rotor current control scheme of a doubly-fed induction generator equipped with superconducting magnetic energy storage for voltage and frequency support[J]. Chin. Phys. B, 2015, 24(7): 70201-070201.

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A novel transient rotor current control scheme of a doubly-fed induction generator equipped with superconducting magnetic energy storage for voltage and frequency support

A novel transient rotor current control scheme of a doubly-fed induction generator equipped with superconducting magnetic energy storage for voltage and frequency support

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