A Sub-Synchronous Oscillation Suppression Strategy for Doubly Fed Wind Power Generation System

During the power transmission of doubly-fed induction generator (DFIG), due to the influence of series compensating capacitance and long-distance transmission, DFIG is prone to sub-synchronous oscillation, which damages the stability of the system. By establishing the mathematical model of DFIG syst...

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Bibliographic Details
Published in:IEEE access 2021, Vol.9, p.83482-83498
Main Authors: Meng, Fanyi, Sun, Dongyang, Zhou, Kai, Wu, Jun, Zhao, Fanqi, Sun, Li
Format: Article
Language:English
Subjects:
Control methods
Controllers
Doubly fed induction generator
Doubly fed induction generators
Frequency control
Induction generators
Oscillators
Performance degradation
Phase locked loops
phase-locked loop
quasi resonance controller
rotor side converter
Rotors
stator side converter
Stator windings
sub-synchronous oscillation
Wind power
Wind power generation
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Summary:During the power transmission of doubly-fed induction generator (DFIG), due to the influence of series compensating capacitance and long-distance transmission, DFIG is prone to sub-synchronous oscillation, which damages the stability of the system. By establishing the mathematical model of DFIG system, the cause of sub-synchronous oscillation and its influence on the control strategy of DFIG system are discussed. In order to solve the problem of performance degradation of traditional phase-locked loop (PLL) under sub-synchronous oscillation, an improved PLL is proposed to replace the traditional PLL. Aiming at the problem that the control of rotor side converter(RSC) and grid side converter(GSC) in doubly-fed wind power generation system under sub-synchronous oscillation is disturbed by harmonic signals, a control method of adding a quasi resonant controller in the control link of RSC and GSC to suppress sub-synchronous oscillation is proposed, and the feasibility of the method is verified by simulation and experiment. Finally, based on the research process of RSC direct resonance control, the sub-synchronous oscillation suppression strategy based on harmonic current extraction is proposed for the frequency adaptability of the quasi resonant controller. The actual performance of the sub-synchronous oscillation suppression strategy is verified through simulation and experiment. The experimental results show that the strategy is effective.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2021.3087638