Coupling Characteristics of DFIG-based WT Considering Reactive Power Control and Its Impact on Phase/Amplitude Transient Stability in a Rotor Speed Control Timescale

The transient stability issues caused by doubly fed induction generator (DFIG)-based wind turbines (WTs) are receiving increasing attention. The q-axis reactive power control (QCtrl), as an essential part of DFIG-based WTs, has a significant impact on its transient response. In this paper, the impac...

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Published inCSEE Journal of Power and Energy Systems Vol. 8; no. 2; pp. 511 - 522
Main Authors Wangqianyun Tang, Jiabing Hu, Rui Zhang, Xu Chen, Zhengang Yang
Format Journal Article
LanguageEnglish
Published Beijing Chinese Society for Electrical Engineering Journal of Power and Energy Systems 01.03.2022
China electric power research institute
Subjects
Amplitudes
Coupling
Dynamic models
Electric potential
Electricity distribution
Energy storage
Engineering
Generators
Induction generators
Laboratories
Power control
Reactive power
Rotor speed
Speed control
Stability analysis
Time
Transient response
Transient stability
Turbines
Voltage
Wind power
Wind turbines
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Summary:The transient stability issues caused by doubly fed induction generator (DFIG)-based wind turbines (WTs) are receiving increasing attention. The q-axis reactive power control (QCtrl), as an essential part of DFIG-based WTs, has a significant impact on its transient response. In this paper, the impact of QCtrl on the phase/amplitude transient stability of a DFIG-based WT-dominated system is analyzed from the perspective of internal voltage amplitude-phase coupling characteristics. First, an amplitude/phase dynamic model of a DFIG-based WT in rotor speed control timescale (in seconds, corresponding to traditional electromechanical timescale) is developed. Then, in comparison with familiar synchronous generators (SGs), an inherently amplitude-phase characteristic of internal voltage for a DFIG-based WT is identified. Next, taking the DFIG-based WT-dominated system as an example, the impact of QCtrl on system transient stability via the internal coupling paths is analyzed. A novel phase-amplitude coupling instability mechanism is found, which is different from that in a traditional SG-dominated system. Finally, the effects of different QCtrl strategies on transient stability are discussed.
ISSN:2096-0042
2096-0042
DOI:10.17775/CSEEJPES.2020.04280