基于标准传递函数的励磁系统聚合

Aggregation of Excitation Systems Based on Standard Transfer Functions

在电力系统动态等值中,如果各发电机励磁系统模型相同,则等值励磁系统的模型可以采用单机励磁系统模型,其等值参数可以采用加权求和法方便地获得。文中针对各发电机励磁系统可能多种多样的情况,提出采用统一的标准传递函数作为等值励磁系统模型的结构,采用分段线性多项式函数(PLPF)法来获得等值励磁系统模型的参数。仿真算例结果表明,聚合前后励磁系统的频率和时域特性都非常接近,由此验证了所述励磁系统等值模型和聚合方法的有效性和适用性。

In dynamic equivalents of power systems, if the excitation systems of the coherent generators are of the same type, the equivalent excitation system has the same type and the same model, and the equivalent parameters could be obtained with the weighted summation. However, the excitation systems of the coherent generators may be different. For this case, the uniform stand transfer function as the model of equivalent excitation system are proposed, and the parameters of the equivalent excitation systems are estimated by piecewise linear polynomial function （PLPF） method. The simulation results show that the frequent and time domain characteristics are very proximal before and after excitation system aggregation. This proves the effectiveness and adaptability of the proposed method.