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.

Wangqianyun Tang;Jiabing Hu;Rui Zhang;Xu Chen;Zhengang Yang

Electric Power Research In-stitute,China Southern Power Grid,Guangzhou 510080,China;State Key Laboratory of Advanced Electro-magnetic Engineering and Technology and School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;State Key Laboratory of Advanced Electro-magnetic Engineering and Technology,and School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;China Southern Power Grid,Guangzhou 510080,China

中国电机工程学会电力与能源系统学报（英文版）

[1]Wangqianyun Tang;Jiabing Hu;Rui Zhang;Xu Chen;Zhengang Yang-.Coupling Characteristics of DFIG-based WT Considering Reactive Power Control and Its Impact on Phase/Amplitude Transient Stability in a Rotor Speed Control Timescale)[J].中国电机工程学会电力与能源系统学报（英文版）,2022(02):511-522

Timescale,QCtrl

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