大规模双馈风力发电机组并网的动态仿真模型与初始化

Wind Turbine Model and Initialization Analysis with High Penetration of Grid-connected Wind Farms of DFIG Type

研究了双馈式感应发电机(DFIG)的风力发电场接入电网后对系统动态特性的影响。从异步发电机运行的物理本质出发,系统推导了计及并网特性、基频下的DFIG动态数学模型。给出了DFIG转子侧及网络侧换流器的控制策略,研究和探讨了系统动态模型的初始化。算例仿真结果验证了所提出的模型和方法的有效性。

The wind turbine model with Doubly-fed Induction Generator （DFIG） type for power system dynamic behaviour evaluations considering large-scale grid-connected wind farms is systematically discussed in this paper. Based on the principles of induction machines, a comprehensive dynamic mathematic model is given for DFIGs, This model is derived under base frequency and considering grid connectivity characteristics of DFIG. Furthermore, the control strategies of rotor-side converter and grid-side converter are considered in the present work. In accordance with the steady state operating conditions, initialisation of the dynamic model is studied in detail using analytical method. Results from case studies validate the effectiveness of the model and method.