双馈风力发电机组系统接入与稳定运行仿真

Simulation Study on Grid Integration and Steady Operation of Doubly-Fed Wind Turbine Generators

分析了包含大量异步风力发电机组的风电场并网运行后对电力系统静态和动态稳定性的影响。从系统接入和稳定运行的角度研究了双馈风力发电机组及普遍采用的定子磁链定向矢量控制策略在提高风电系统稳定性方面的优势与不足。以实际机组为例在PSCAD/EMTDC平台上建立了仿真模型,结果表明双馈风力发电机组在风速发生变化时不仅能够以变速恒频方式运行并追踪最大风能,且电网电压也比传统鼠笼式风力发电机组更为稳定。在系统发生最严重的三相接地故障时,风电场具有更好的暂态稳定性。

The influence of connecting wind farm containing a large amount of asynchronous wind turbine generators into power grid on steady state and dynamic stability of power grid is researched. From the viewpoint of connecting doubly-fed induction wind turbine generators into power grid and steady operation, the advantage and limitation of field oriented vector control strategy for doubly-fed wind turbine generator in the field of improving stability of wind power system are analyzed. Taking practical wind turbine generator for example, a simulation model is established on the platform of PSCAD/EMTDC. Simulation results show that the doubly-fed wind turbine generator can operate in variable speed constant frequency （VSCF） mode and trace maximum wind energy while wind speed varies, and the voltage of wind power system consisting of doubly-fed wind turbine generators is more stable than that of wind power system consisting of traditional squirrel-cage induction generators, and the wind farm consisting of doubly-fed wind turbine generators possesses better transient stability while the most severe three-phase earth fault occurs.