基于等效变换的牵引负荷建模

A traction load modeling method based on equivalent transformation

建立了一种将牵引负荷等效变换为所接入系统高压侧短时故障模型,通过分析斯科特型牵引变压器的接线方式,将二次侧牵引负荷变换至一次侧,并作为短时网络故障接入公用电网,可同时描述牵引负荷的冲击性、非线性及不对称性。基于PSASP软件分别对负荷的冲击模型、负荷的等效故障变换模型进行仿真,结果验证了等效故障变换模型的正确性及实用性。通过一地区电网电能质量指标的计算,分析了牵引负荷对地区电网电能质量的影响。

A model is established which transforms traction load equivalently to network short-term fault. Based on analysis on wiring model of Scott traction transformer, traction load on the transformer secondary side is transformed to primary side and connected to regional power network as short-term network fault. The impact, nonlinearity and asymmetry characteristics of traction load are represented in the model. The comparison between simulation results with PSASP software package based on both impact load model and transformation model shows the validity of the proposed method. The impact of traction load on power quality of regional power network is also analyzed based on the calculation of related power quality indexes.