電動機(jī)起動時(shí)電網(wǎng)電壓降的公式與仿真計(jì)算比較
張曼,牛濤,郭學(xué)英
(江蘇省電力設(shè)計(jì)院,江蘇 南京 211102)
摘 要:介紹了工程中常用的兩種公式計(jì)算電網(wǎng)母線電壓降的方法,以某工廠電動機(jī)負(fù)荷接入系統(tǒng)起動為例進(jìn)行仿真,分析了起動時(shí)間、起動功率因數(shù)等對母線電壓降的影響。公式與仿真計(jì)算比較表明,母線短路容量越大,公式與仿真計(jì)算電壓降結(jié)果越接近;公式計(jì)算方法的輸入條件僅為電網(wǎng)及電動機(jī)的一些穩(wěn)態(tài)參數(shù),無法體現(xiàn)起動時(shí)間、起動功率因數(shù)等對母線電壓降的影響;工程實(shí)際應(yīng)用中如果數(shù)據(jù)充分,建議采用仿真方法計(jì)算電動機(jī)起動時(shí)電網(wǎng)母線電壓降。
關(guān)鍵詞:電動機(jī)起動;電壓降;仿真計(jì)算;公式計(jì)算
中圖分類號:TM32;TM744 文獻(xiàn)標(biāo)識碼:A 文章編號: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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