计及静态临界稳定特性的感应电动机群聚合等值方法

Aggregation of Induction Motor Group Considering Physical Characteristics and Static Critical Stable Characteristics

负荷模型对电力系统稳定计算结果有着重要的影响,而感应电动机群聚合是负荷等值建模的重要组成部分。考虑感应电动机静态临界稳定特性的影响,提出了一种感应电动机群负荷聚合等值的新方法。首先,分析了表征电动机静态临界稳定特性强弱的指标,据此将电动机群负荷分为稳定性好和稳定性差的2组。而后,基于各电动机的物理机理,并综合考虑其静态临界稳定特性,对分组后的感应电动机群负荷进行聚合。最后,以单机无穷大系统、WSCC-9节点系统和EPRI-36节点系统为算例,考察了该聚合方法与其他方法所得等值模型在不同故障方式下的系统响应,验证了所提方法在不同运行条件下的适用性和所得等值模型的准确性。

Induction motor aggregation is one of the most important parts in load modeling with strong influence on power system stability analysis. Considering influence of induction motor＇s static critical stable characteristics, a new aggregation algorithm of induction motor group was proposed. Firstly, induction motor group was divided into two groups according to their indexes representing static critical stability. Secondly, the divided induction motor groups were aggregated based on their physical mechanism while considering static critical stable characteristics. Finally, taking single machine infinite systems, WSCC-9 bus system and EPRI-36 bus system as examples, system response in different fault states was investigated using the proposed aggregation algorithm and other methods. Applicability of the proposed algorithm under different operating conditions and accuracy of the equivalent model were validated by test results.