风力发电机组暂态模型和稳定性分析方法评价

Assessment of transient models and stability analysis methods for wind power generation units

在分析并网笼型异步发电机暂态稳定性机理的基础上,分别建立了考虑定子电磁暂态的详细模型和忽略定子电磁暂态的简化模型,以及1个和2个等效质量块的风力机轴系模型。针对上述4种不同组合的风力发电机组模型,利用Matlab/Simulink对定子3相短路故障情况下的机组暂态行为进行了仿真比较。在此基础上,利用一种计算异步发电机临界故障切除转速的传统直接法对临界切除时间进行了估算,并与时域仿真法进行了比较分析。结果表明,风力机轴系不同质量块模型对机组暂态稳定性分析的结果影响很大,采用临界切除转速的传统直接法难于正确估算临界切除时间。

The transient stability principle of squirrel cage induction generators was analyzed. A detailed generator model （including stator electrical transient）, simplified generator model （neglecting stator electrical transient）, and one-and two-mass shaft system models were built. Based on the four different wind turbine unit models, the dynamic behaviors were simulated and compared using Matlab/Simulink, under the condition that the generator stator terminal was subjected to a 3-phase short-circuit fault. Furthermore, the critical clearing time （CCT） was calculated and compared using a direct method with the critical clearing speed of induction generator and the simulation method of trial and error. Results show that the different shaft system mass models influence the transient stability analysis of the wind turbine units significantly, and the direct method of CCT estimation based on the critical clearing speed is incompatible,