基于混合动态仿真的发电机组模型有效性评估

Validity Evaluation of a Generator Set Model Based on Hybrid Dynamic Simulation

发电机组是决定电力系统动态行为特征的关键设备,其数学模型及参数是否有效将直接影响系统动态仿真结果,所以对机组仿真模型的有效性评估显得尤为重要。近年来提出的基于相量测量单元(PMU)数据的混合动态仿真,为电力系统元件的模型验证提供了新思路。文中提出发电机组仿真模型有效性评估方法,利用理想电压源法实现混合动态仿真,并结合残差分析和相关系数计算实测曲线与仿真曲线的数值相似度及形状相似度,用相似度指标量度模型有效性并进行模型参数修正。最后以南方电网机组为例,验证了发电机组模型有效性评估方法是可行、正确的。

The generator set is the key equipment for the dynamic behavior of a power system. The effectiveness of its mathematical model and parameters will directly influence the dynamic simulation results of the system. Hence the validity of the generator set model is of particular importance. In recent years, hybrid dynamic simulation based on the data from PMU has provided a new idea for simulation model validation of power system components. An ideal voltage source method is used to achieve hybrid dynamic simulation of generator set. The numerical value similarity and shape similarity of measured and simulated curves, calculated using residual analysis and the related coefficient, is proposed for validity evaluation of simulation model. Then the similarity index is utilized to quantify model validity and calibrate models. Finally, the efficiency of the method is verified by case studies on the CSG generator set.