大型电动机直接起动引起的局部电网电压波动

Voltage Fluctuation of Local Network Duringa Large AC Motor Directly Starting

根据局部电网的持性，给出了大型电动机起动引起电网电压波动的计算方法。计算实例表明，该方法迭代收敛快，可供用电部门在电动机选型核算时参考。此外，文中还讨论了电动机起动电流倍数和起动电机容量占主变压器容量百分比对电压波动的影响。

According to the characteristics of the local electric network, a calculationmethod of the local network during AC motor starting is presented inthis paper. For this method, the convergence is good. It is useful to the typeselection of large AC motors. The effects of starting current ratio and the maintransformer capacity on the voltage fluctuation are also discussed.