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| Several Key Issues on Stability Study of DFIG-Based Wind Turbines with Negative Sequence Control during Low Short-Circuit Ratio Power Grids |
| Xu Hailiang1, Wu Han1, Li Zhi1, Zhao Rende1, Hu Jiabing2 |
1. College of New Energy China University of Petroleum(East China) Qingdao 266580 China;
2. School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China |
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Abstract Due to the reverse distribution characteristics of wind power resources and power load in China, low short circuit ratio has become the main form of wind turbines tied into power grid. The interaction between the doubly-fed induction generator (DFIG)—based wind turbines and the power grid is easy to lead to the small interference instability issue under symmetrical power grid with low short circuit ratio. Under asymmetric power grid, the positive and negative sequence impedance and its coupling components will lead to more complex interaction with the grid-side and rotor-side converters, and the instability risk needs to be studied and evaluated. Based on the existing research, the key challenges to the stability of DFIG system with negative sequence control under low short-circuit ratio power grid are analyzed. In view of the key issues, corresponding solutions are proposed, proceeded from the aspects of impedance modeling, stability analysis and control strategy improvement. Finally, the development prospects of related technology are discussed.
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Received: 01 March 2021
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2021, Vol. 36 
