计及负载率和临界滑差的改进感应电动机加权聚合

An Improved Weighting-mean Aggregation Method of Induction Motors Considering Load Rates and Critical Slips

在暂态稳定仿真中所用的等值感应电动机的模型参数对仿真精度的影响很大。为了获取这些参数,大多采用基于容量加权的模型参数聚合法。感应电动机群中的各电动机初始滑差不同对聚合结果有重要影响,而该初始滑差由负载率和临界滑差联合决定。文中据此提出了利用负载率和临界滑差来修正的感应电动机加权聚合法。算例表明,依据该方法所聚合出的等值感应电动机能更好地模拟原感应电动机群对暂态稳定性的影响。研究还表明,由于实际系统中参与聚合的感应电动机个数很多,且其负载率分布具有随机性,用统计综合法得到的等值感应电动机模型参数基本可用。

Study on the effect of load rates and critical slips in the aggregation of induction motors in transient stability simulation shows that the two aspects have great influence on the accuracy of aggregation..An improved weighting-mean aggregation method for aggregating a group of induction motors is suggested. In this method, besides capacities of motors, load rates and critical slips are also taken into account. Simulation results show that the aggregated induction motor obtained by the proposed method can simulate the original group of induction motors very well in transient stability analysis. Simulation results also show that, in case of aggregating a large number of induction motors in a distribution system considering their random characters in load rates, the aggregated parameters of the equivalent induction motor obtained by the so-called statistic synthesis based method may be acceptable usually.