肖垒,蔺红.直驱风电场经交流并网系统dq阻抗模型及稳定性分析[J].电测与仪表,2023,60(12):65-70. Xiao lei,Lin hong.Dq impedance model and stability analysis of Direct-drive wind farm via AC grid-connected system[J].Electrical Measurement & Instrumentation,2023,60(12):65-70.
直驱风电场经交流并网系统dq阻抗模型及稳定性分析
Dq impedance model and stability analysis of Direct-drive wind farm via AC grid-connected system
In order to study the new subsynchronous oscillation problem caused by the interaction between the controller and the grid in the direct drive wind farm through the AC grid-connected system, comprehensively considering the internal control dynamic characteristics, AC dynamic response and power transmission characteristics of the converter, the dq equivalent impedance model of the direct-drive wind turbine through the AC grid-connected system is deduced. Combined with the stability criterion of the system impedance, the influence of the change of the internal control parameters of the grid-side converter of the direct-drive wind turbine on the subsynchronous oscillation is analyzed. Research shows that as the PI control parameters (Kp, Ki) of the inner and outer loops of the grid-side converter decrease, the risk of oscillation instability increases and the system stability decreases. Finally, the correctness of the model and theoretical analysis is verified by time-domain simulation under PSCAD/EMTDC environment.
