针对电压慢恢复现象的电机负荷建模方法

Motor load modeling for voltage recovery delay phenomenon

针对传统负荷模型无法反映电力系统故障后电压慢恢复现象,提出一种新的负荷模型,该模型在传统综合负荷模型的基础上增加了易堵转电机和安装低压保护电机的模型,并采用统计综合法的思想,考虑电机堵转和安装低电压保护以及电机堵转后自启动现象给系统电压恢复造成的影响。仿真算例结果表明,所提负荷模型能够还原电压慢恢复的动态过程,改进了传统的综合负荷模型只能得到电压立即恢复动态过程的不足。

Since the traditional load model cannot reflect the voltage recovery delay phenomenon of power system,an improved load model is proposed,which adds the models of motor with locked rotor and motor with low-voltage protection to the traditional integrated load model and adopts the idea of statistical synthesis method to consider the impacts of motor with locked rotor,motor with low-voltage protection and self-starting phenomenon after rotor lock on the voltage recovery of system. Simulative results show that,the proposed load model can incarnate the dynamic process of slow voltage recovery,instead of the dynamic process of instant voltage recovery by the traditional integrated load model.