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利用数学公式分析电力机车励磁涌流大小,基于MATLAB/SIMULINK搭建电力机车牵引主变压器模型,分析得出合闸时间、剩磁、变压器容量和接触网电压幅值是影响励磁涌流大小的因素。建立车载主变压器、接触网和牵引变压器的仿真系统,选取电压波动作为评估励磁涌流对电力系统公共连接点影响的参数。分析电力机车发生励磁涌流时,不同牵引变压器接线形式下公共连接点电压波动的大小,并得出励磁涌流对公共连接点存在影响但不明显的结论。
The mathematical model is used to analyze the inrush current of electric locomotive. Based on MATLAB / SIMULINK, the main traction transformer model of electric locomotive is established. It is concluded that the closing time, remanence, transformer capacity and catenary voltage amplitude are the factors affecting the size of the inrush current. The simulation system of vehicle main transformer, catenary and traction transformer is established. The voltage fluctuation is selected as the parameter to evaluate the influence of magnetizing inrush current on the common connection point of power system. When the magnetizing inrush currents occur in electric locomotives, the voltage fluctuation of common connection points under different traction transformer connection forms is analyzed. The conclusion that the inrush current has an influence on the common connection point is not obvious.