并网异步风力发电机组模型及参数对其暂态稳定性的影响

INFLUENCE OF MODELS AND PARAMETERS ON TRANSIENT STABILITY OF GRID-CONNECTED ASYNCHRONIZED WIND POWER GENERATION UNITS

建立了笼型异步发电机考虑定子电磁暂态的详细模型、忽略定子电磁暂态的简化模型、同时忽略定转子电磁暂态的稳态模型以及一个和两个质量块的风力机轴系模型。针对上述不同组合的5个风力发电机组模型,利用Matlab/Simulink对发电机端部发生三相短路故障情况下的机组暂态行为进行了仿真比较,并通过时域仿真求取了风力机组不同模型下机组故障临界切除时间。结果表明,采用不同风力机组模型对机组暂态稳定性分析结果有很大影响,发电机简化模型和两个质量块的风力机轴系模型较为合适。最后,以提出的合适模型为例,详细研究了风力机模型参数对机组暂态稳定性的影响。

In order to study more suitable models for transient stability analysis of grid-connected squirrel cage induction generators for wind generation, the detailed generator model （including stator electrical transient）, the reduced generator model （neglecting stator electrical transient） and the steady generator model （neglecting both stator and rotor electrical transient） as well as the one-mass ＆ two-mass driven train system models were established respectively. Based on five combinations of the generator models and turbine shaft models, the transient behaviors by using different models were compared with Matlab/Simulink, when the stator terminal of SCIG was subjected to a three-phase short-circuit fault. In addition, the fault critical clearing time （CCT） was also calculated as the index of transient stability analysis. The results show that the different combined models of wind generator system have an important effect on the analysis of transient stability. The reduced generator model with the two-mass model may be more suitable. Finally, by using the proposed suit- able model, the influence of various parameters of wind turbines on the transient stability was also analyzed.