混合拖动设备的负荷模型研究

Research on Load Model of Mixed Driving Equipment

在实际电网中,变频拖动设备具有较特殊的负荷特性,对电网的安全稳定造成了潜在影响。现有的拖动负荷中,常规的基于异步电动机的拖动设备和新型基于电力电子技术的变频拖动负荷分别占有不同比例。根据常规拖动负荷和变频拖动负荷的机理模型,采用目前广泛使用的CLM结构,通过拟合辨识得到不同混合比例的拖动负荷模型参数。基于PSD-BPA平台,将其应用于变频拖动负荷占比较大的某实际电网,通过仿真对比分析,研究了其对实际电网电压、有功和无功动态特性的影响。

Variable frequency drive（VFD） based drive load has potential hazard to power system for its particular load characteristics. With the increasing proportion of VFD load in power grid, the adaptability of existing load model is challenged. The proportion of traditional drive load and VFD load in the mixed drive load model is different. According to the mechanism model of traditional motor drive load and VFD load respectively, the parameters of the mixed drive load model are obtained by fitting the curve with conventional CLM structure. The parameters can be applied to a grid with high proportion of VFDs, and can be used to make a simulation analysis based on PSD-BPA platform. The results show that the problems associated with voltage, active power and reactive power will be more serious in this circumstance.