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Modelling and Control of Nine-Switch Converter-Based DFIG Wind Power System
Dongliang Liu,Xu Zhang,Lei Pan,Aqiang Li 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.6
In this paper, nine-switch converter (NSC) is used to replace the Back-to-Back converter of DFIG wind power system. In order to simplify the control process and improve the performance, the switching function model of nine-switch converter under ABC coordinate system is established, and the mapping relationship between the parameters of NSC’s loads and those of DFIG wind energy conversion system is given. Meanwhile, a Resonant-proportional-integral (Resonant-PI) control strategy for NSC-based DFIG wind energy conversion system is proposed, and the PI controller is used for static control under steady state and the resonant controller for suppressing harmonic content in this method. The proposed method performs better than PI control in harmonic content and dynamic response. The simulations and experimental results verify the validity and reliability of the proposed mathematical model and control algorithm.