感应发电机暂态电压稳定性定量分析

Quantitative Analysis for Transient Voltage Stability of Induction Generators

比较了感应发电机和感应电动机的暂态电压稳定特性;对应于感应电动机的暂态电压稳定判据,提出了感应发电机的暂态电压稳定判据及相应的稳定裕度定义。其中综合考虑了节点电压和转子转速的影响,合理设计了多判据的执行流程,以保证远离临界条件时的快速性及接近临界条件时的准确性。用反复仿真试探到的暂态电压稳定的故障临界切除时间作为标准,考核基于上述稳定裕度的灵敏度分析算法。仿真结果证实,上述判据及裕度指标可以准确反映感应发电机的电压稳定程度。

Comparisons of transient voltage stability characteristics between induction generators and induction motors are conducted.In correspondence with that of the induction motors,transient voltage stability criterions and stability margin definition for induction generators are proposed.The impacts on transient voltage stability of both node voltage and rotor speed are comprehensively considered.A multi-criteria assessment process is designed to speed up the evaluation for the cases far away from the critical condition,and to ensure the accuracy for the cases close to the critical condition.Sensitivity analysis is performed based on the fault critical clearing time obtained through trial-and-error based on full scale time domain simulations.The results prove the accuracy of using the proposed criterion and margin index to reflect the degree of induction generators voltage stability.