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1 12脉冲整流型UPS的输入谐波特性1.1 12脉冲整流器UPS的工作原理及主要输入谐波参数如所周知:6脉冲可控硅整流型UPS典型输入电流谐波参数(满载)为:输入功率因数PF=0.8,总的输入电流谐波分量THDI=32%～34%r,其最大输入电流谐波分量出现在5次谐波分量上。为降低6脉冲可控硅整流型UPS的THDI所采取的一种技术措施是:采用如图1(a)所示的12脉冲可控硅整流型UPS设计方案。三相交流输入电源首先经由隔离变压器(原边为△形的单绕组、副边为△形和Y形的双绕组)将从输入电源
1 12 pulse rectifier UPS input harmonic characteristics 1.112 pulse rectifier UPS operating principle and the main input harmonic parameters As we all know: 6 pulse rectifier thyristor UPS typical input current harmonic parameters (full load) are: input power The factor PF = 0.8, the total input current harmonic component THDI = 32% ~ 34% r, the maximum input current harmonic component appears in the 5th harmonic component. A technical measure taken to reduce the THDI of a 6-pulse thyristor rectifier UPS is to adopt a 12-pulse thyristor rectifier UPS design as shown in FIG. 1 (a). Three-phase AC input power first through the isolation transformer (the primary side of the single-delta for the shape, the secondary side of the △ -shaped and Y-shaped double winding) from the input power supply