Frequency Modulation and Rotor Speed Recovery Strategy of Doubly-Fed Induction Generator Based on Model Predictive Control

doi:10.11930/j.issn.1004-9649.202210120

Abstract

Abstract: The doubly-fed induction generator (DFIG) can participate in the system frequency modulation by releasing the kinetic energy stored in the rotor, but it may cause a secondary frequency drop when the speed is recovered, which is adverse to the frequency stability of the system. Therefore, a strategy for restoring the speed of the rotor in the inertia control of DFIG based on model predictive control is presented in this paper. Firstly, based on the influence of the active power reduction on the system frequency and the rotor speed in the inertia control of DFIG when the speed is recovered, the predictive control model is established; secondly, the objective function considering the reduction of the secondary frequency drop of the system and the recovery of the rotor speed is formulated, and the active power reduction in line with the system frequency in real time is optimized, so as to suppress secondary frequency drop, ensure rotor speed recovery, and improve the stability of the system frequency; lastly, the simulation model is established on the Matlab/Simulink to verify the effectiveness of the proposed control strategy.

Key words: DFIG, frequency control, rotor speed recovery, model predictive control

ZHAO Jingjing, DU Ming, LIU Shuai, LI Zibo, MA Wenhe. Frequency Modulation and Rotor Speed Recovery Strategy of Doubly-Fed Induction Generator Based on Model Predictive Control[J]. Electric Power, 2023, 56(6): 11-17.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202210120

https://www.electricpower.com.cn/EN/Y2023/V56/I6/11

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