1.浙江运达风电股份有限公司，浙江省杭州市 310012;2.浙江省风力发电技术重点实验室，浙江省杭州市 310012
1.Zhejiang Windey Co., Ltd., Hangzhou 310012, China;2.Zhejiang Key Laboratory of Wind Power Technology, Hangzhou 310012, China
This work is supported by National Key R&D Program of China (No. 2018YFB0904000).
Studies are conducted aiming at the problem of insufficient research on the load characteristics of grid fault ride-through of doubly-fed induction generator (DFIG) based wind turbines. Firstly, based on the spring-damping-quality modeling method, a response model of DFIG based wind turbines for the load of drive train shafting and the side-to-side vibration of tower is established, and then the analytical expressions of the system natural resonance frequency and damping coefficient are obtained. The theoretical analysis results show that the grid fault ride-through process may cause torsional vibration of the drive train and the side-to-side vibration of tower. Secondly, a co-simulation model of GH Bladed and MATLAB is established, and the effects of symmetrical and asymmetrical grid fault ride-through process on load characteristics of the drive train shafting and tower based on the co-simulation model are studied. Simulation results verify the correctness of the theoretical analysis. Finally, the influence of different active power recovery strategies on the load of wind turbines is further analyzed. The research results show that the over-fast active power recovery rate will significantly increase the load of wind turbines. Therefore, the principle of grid fault ride-through control for “mechanically friendly” wind turbines is furtherly proposed.
YING You,SUN Yong,YANG Jing,et al.Load Characteristic Analysis of Grid Fault Ride-through Process for DFIG Based Wind Turbine[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20190911006.