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以下公式适用于电源模块的额定输入电流 ie:ie = k × irated
每单位变压器加载电压降 ie:uk = zs × ie / uo = zs × k × irated / uo
使用 ie 与 irated 之间的规定比值,计算得到的单位电压降为 uk =1 % 或 2.3 v。因此,对于电源模块来说,此变压器的作用就像是 uk = 1 % 的输入阻抗。
基于短路功率比评估变频器系统中系统扰动的量值 rsc:
rsc = scν / p
根据 en 60146-1 的该定义,p 是由变频器吸收的基波视在功率。
scν 是在端子 u1、v1、w1上发生短路时从电网吸收的短路功率。因为在实际操作中阻抗的阻性部件可以忽略,zn ≈ j xn 应用
scν ≈ 3 × uo2 / xn
因此 rsc ≈ 3 × uo2 / (xn × p)
因此,短路功率比 rsc 取决于变频器的当前输出功率 p,并由网络阻抗 xn 决定。
如果我们假定功率为 p ≈ 3 × uo × ie = √3 × urated × ie
则短路功率比 rsc 与有效输入阻抗两端的单位电压降 uk 成反比。
rsc ≈ 3 × uo2 / (xn × p) = 3 × uo2 / (xn × 3 × uo × ie) = uo / (xn × ie) = 1 / uk
例如,如果未安装电源电抗器 (ze = 0),则短路功率比为 rsc ≈ 100
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