Nonlinear Oscillation Behaviors Analysis of DFIG-WT -dominated System with Transient Control Switches

• Published in: 2022 IEEE 7th Southern Power Electronics Conference (SPEC) pp. 1 - 6
• Main Authors: Tang, Wangqianyun, Zhang, Rui, Li, Wenyun, Liu, Yuming, Zhai, Suwei
• Format: Conference Proceeding
• Language: English
• Published: IEEE 05.12.2022
• Subjects: Behavioral sciences; control switch; Control systems; DFIG-WT-dominated; discontinuous; nonlinear; Process control; Rotors; Steady-state; Switches; transient oscillation characteristic; Wind turbines
• ISSN: 2832-2983
• DOI: 10.1109/SPEC55080.2022.10058388

Same as synchronize generator dominated system, transient oscillation also occurs in doubly fed induction generator-based wind turbine (DFIG-WT) dominated system. However, since DFIG-WTs employ normal/transient vector controls, they have strong nonlinear and discontinuous features. These features lead the oscillation responses of DFIG-WT-dominated system to be significantly changed, especially after large disturbance. The oscillation characteristics would be time-varying and could not be predicted according to pre-fault states as usual. This paper analyzes the transient oscillation characteristics of DFIG-WT-dominated system and discusses the effects of transient control switches. Firstly, the regulation process of transient controllers under fault are analyzed. Then, a series of transient model of DFIG-WT in different fault stages are established. Next, the transient oscillation characteristic of DFIG-WT-dominated system is analyzed. Finally, as a key factor that impact the post-fault initial states, the influence rules of transient control parameters are discussed.