NDLI: Modelling and comparison analysis of grid-connected DFIG-based wind farm in weak grid

Content Provider	IET Digital Library
Author	Yan, Cai Yao, Wei Wen, Jianfeng Fang, Jiakun Ai, Xiaomeng Wen, Jinyu
Abstract	This study proposes a generic method for modelling and comparison analysis of grid-connected double-fed induction generator (DFIG)-based wind farms in a weak grid. A detailed model of DFIG in a weak grid is established and used as a benchmark. Specifically, the detailed model consists of the mechanical part, generator part, rotor side converter, and phase-locked loop (PLL). Two simplified models of grid-connected DFIG-based wind farms in a weak grid are compared with the detailed model to investigate the mechanism of sub-synchronous oscillation (SSO) as well as the influential factors through linear system analysis. The first simplified model ignores shafting dynamics, stator flux dynamics, and PLL dynamics. The same assumptions are used in the latter, except that PLL dynamics are considered. Time-domain simulation and eigenvalue analysis are used to verify the accuracy of the simplified models. The block diagrams of the linearised system are derived based on the proposed model, and the oscillation mechanism is explained by linear system analysis. Through eigenvalue analysis and the root locus method, the influences of the parameters of the DFIG and its controllers on the system stability are identified and analysed.
Starting Page	2406
Ending Page	2415
Page Count	10
ISSN	17521416
Volume Number	14
e-ISSN	17521424
Issue Number	Issue 13, Oct (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rpg/14/13
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2019.1382
Journal	IET Renewable Power Generation
Publisher Date	2020-06-19
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Asynchronous Generator Asynchronous Machine Control of Electric Power System Demodulator Discriminators And Mixers Eigen Values And Eigen Function Eigenvalue Analysis Grid-connected DFIG-based Wind Farm Grid-connected Double-fed Induction Generator Linear System Analysis Mechanical Component Modelling Comparison Analysis Modulator Phase Locked Loop PLL Dynamics Power Generation Control Rotors Shafts Stators Weak Grid Wind Power Plant
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment

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