变频拖动设备对负荷模型参数的影响分析

Analysis on Influence of Variable Frequency Driving Equipment on Parameters of Load Model

针对大中功率的全控型变频拖动设备使用比例日益增大的问题,分析其对现有负荷模型的影响,并对大比例变频拖动设备的负荷模型参数进行了修正,将修正后的负荷模型及其静态负荷模型应用于某地区电网进行仿真计算和分析。所得结果:当系统电压跌落时,变频拖动设备使系统无功需求急剧增大,对系统的阻尼特性降低。

In allusion to the problem of increasing use ratio of full-control type variable frequency driving （VFD） equipment with high and medium power, this paper analyzes influence of VFD equipment on the existing load model and modifies parameters of the load model for the high proportion of VFD equipment. The load model and its static load model after modification are both applied in one regional power grid for simulating calculation and analysis. The results indicate that when system voltage drops, the VFD equipment will make requirement for system reactive power rapidly increase and reduce damping characteristic of the system.