DM6461X1-A3
DM6461X1-A3
DM6461X1-A3
a.增加变频器供电电源内阻抗通常情况下，电源设备的内阻抗可以起到缓冲变频器直流滤波电容的无功功率的作用。这种内阻抗就是变压器的短路阻抗。当电源容量相对变频器容量越小，内阻抗值相对越大，谐波含量越小;电源容量相对变频器容量越大，则内阻抗值相对越小，谐波含量越大。所以选择变频器供电电源变压器时，好选择短路阻抗大的变压器。
b.安装电抗器安装电抗器实际是从外部增加变频器供电电源的内阻抗。在变频器的交流侧或变频器的直流侧安装电抗器或同时安装，可抑制谐波电流。
c.变压器多相运行通常变频器的整流部分是6脉波整流器，所以产生的谐波较大。应用变压器的多相运行，如使相位角互差30°的Y-△、△-△组合的2台变压器构成相当于12脉波整流器，则可减小谐波电流，起到谐波抑制作用。
d.调节变频器的载波比提高变频器载波比，可有效抑制低次谐波。
e.应用滤波器滤波器可检测变频器谐波电流的幅值和相位，并产生与谐波电流幅值相同、相位相反的电流，从而有效地吸收和消除谐波电流。
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厦门泰尼电气有限公司
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