电力系统动态等值参数聚合的实用方法

A Practical Method of Parameter Aggregation for Power System Dynamic Equivalence

在大规模电力系统暂态稳定分析中,为减少数值仿真的计算量,可采取动态等值的方法对系统进行简化。电力系统动态等值包括相关机群动态识别、网络化简和相关机群参数聚合3部分。针对第三部分提出了一种基于加权法的相关机群详细模型参数聚合的方法,该方法可用于获得等值发电机组及其调节系统的详细模型参数和负荷等值异步电动机的详细模型参数。这种方法既达到了参数聚合的目的,又减少了计算时间。对IEEE10机39节点系统和简单配电系统进行仿真,并与频域法相比较,结果表明了该等值方法的有效性。

To reduce the calculation amount of numerical simulation in transient stability analysis for large-scale power grid, the grid can be simplified by dynamic equivalence. The dynamic equivalence of power grid includes three parts： （A） dynamic recognition of coherent unit groups; （B） network simplification and （C） parameter aggregation of coherent unit groups. In part （C）, a weighing method based approach for parameter aggregation of detailed model of coherent unit groups is proposed, by which the detailed model parameters of equivalent generating set and it regulating system as well as that of equivalent asynchronous motor of load can be obtained. Using the proposed approach, not only the purpose of parameter aggregation can be realized, but also the calculation time is reduced. The results from ETMSP/MATLAB based simulation of IEEE 10 machine 39-bus system show that the proposed approach is feasible and available. In addition, taking a simple distribution system for example, the effectiveness of the proposed approach to the equivalence of asynchronous motor groups is also verified.