Suzhou Electric Appliance Research Institute
期刊号: CN32-1800/TM| ISSN1007-3175

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电动机起动时电网电压降的公式与仿真计算比较

来源:电工电气发布时间:2016-08-18 14:18 浏览次数:12
电动机起动时电网电压降的公式与仿真计算比较
 
张曼,牛涛,郭学英
(江苏省电力设计院,江苏 南京 211102)
 
    摘 要:介绍了工程中常用的两种公式计算电网母线电压降的方法,以某工厂电动机负荷接入系统起动为例进行仿真,分析了起动时间、起动功率因数等对母线电压降的影响。公式与仿真计算比较表明,母线短路容量越大,公式与仿真计算电压降结果越接近;公式计算方法的输入条件仅为电网及电动机的一些稳态参数,无法体现起动时间、起动功率因数等对母线电压降的影响;工程实际应用中如果数据充分,建议采用仿真方法计算电动机起动时电网母线电压降。
    关键词:电动机起动;电压降;仿真计算;公式计算
    中图分类号:TM32;TM744   文献标识码:A   文章编号:1007-3175(2016)08-0015-04
 
Comparison on Formula and Simulation Calculation of
Grid Voltage Drop at Time of Motor Starting
 
ZHANG Man, NIU Tao, GUO Xue-ying
(Jiangsu Electric Power Design Institute, Nanjing 2111 02, China)
 
    Abstract: Introduction was made to two commonly used methods in practical engineering for calculating grid busbar voltage drop. This paper took the motor load access system starting of a factory for example and carried out simulation. Analysis was made to the starting time and the starting power factor etc impacts of busbar voltage drop. The calculation and comparison of formula and simulation show that the larger the busbar short-circuit capacity is, the smaller the difference between formula and simulation of voltage drop is. The input conditions of formula calculation are just some steady state parameters of grid and motor, so they cannot reflect the influence of some other parameters on grid voltage drop, such as the starting time and the starting power factor and so on. This paper recommends that the simulation method can be adopted in practical engineering to get grid voltage drop if the condition allows.
    Key words: motor starting; voltage drop; simulation calculation; formula calculation
 
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