Small Signal Stability and Oscillation Suppression Method for Islanded Double Fed Induction Generator-Based Wind Farm Integrated by Modular Multilevel Converter Based HVDC System
Wang Yifan, Zhao Chengyong, Guo Chunyi
State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China
Abstract：The grid integration of islanded double fed induction generator (DFIG)-based wind farms by modular multilevel converter based HVDC (MMC-HVDC) has become an important solution for large-scale wind power transmission and consumption. The islanded wind farm has many different power operating points, which leads to oscillation instability when the MMC with complex internal dynamic characteristics is integrated to the power grid. Firstly, a small-signal model of the integrated system is developed in Matlab, and is validated by the detailed electromagnetic transient simulation in PSCAD/EMTDC. Then, the eigen-analysis is used to study the small-signal stability of the integrated system with the output power of wind farm changes. Based on the participation factor method, the dominate mode and the key parameters leading to the system instability are revealed. The results show that the parameters of circulating current suppression controller (CCSC) have great influence on the stability of the integrated system. If the parameters of CCSC are unreasonable, with the increase of the output power of the wind farm, the system appears oscillation instability. Finally, considering the dynamic characteristics of the CCSC and the constraints of the stability of the whole integrated system, a method is proposed to effectively suppress the small signal instability of the system of DFIG-based wind farms via the MMC-HVDC integrated system.
王一凡, 赵成勇, 郭春义. 双馈风电场孤岛经模块化多电平换流器直流输电并网系统小信号稳定性分析与振荡抑制方法[J]. 电工技术学报, 2019, 34(10): 2116-2129.
Wang Yifan, Zhao Chengyong, Guo Chunyi. Small Signal Stability and Oscillation Suppression Method for Islanded Double Fed Induction Generator-Based Wind Farm Integrated by Modular Multilevel Converter Based HVDC System. Transactions of China Electrotechnical Society, 2019, 34(10): 2116-2129.
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2019, Vol. 34 
