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Some parameters of UPS power factor

Feb 23, 2021

Some parameters of UPS power factor

Generally speaking, the improvement of the input power factor is beneficial to the input power grid because it reduces the interference to the power grid. For UPS, the benefits are not obvious. Because how much power the UPS needs is still absorbed according to its own methods and requirements, probably this is another reason why the general UPS is not eager to solve this problem.


   On the other hand, although the upper limit of the output power factor of the UPS is "1", the PWM power supply in the computer load has not been corrected for its input power factor, so it still requests energy from the UPS according to its own needs. For example, it absorbs 0.6 active power (W) and 0.8 reactive power (VAR). As long as the UPS can adapt to this load, it will be no problem for linear loads with F=1.


  5  Conclusion


   (1) The output power factor of UPS is the ability to adapt to different types of loads, not just the percentage of active power provided. The meaning of a UPS output power factor of 0.8 is: when the load power factor is 0.8, 100% of the UPS rated power can be obtained; when the load power factor is 0.6, the output power of the above UPS will be greatly reduced.


(2) When the output power factor F=1, only 80% of the rated output active power can be given; when F=0.8, 100% of the rated power can be output. The smaller the power factor F, the VA of the output apparent power. The larger the value, the maximum is when F=0. 0.


   (3) Small power factor contains the function of high power factor, not the other way around.


   (4) The calculation of computer power should generally be:


S = ∑ Pi / 0.65 i = 1~n  where S is the total apparent power VA value of n computers; Pi is the active power W value of 1 computer; 0.65 is the computer power factor of zero. Average value from 6 to 0.7. If the superscript of the computer data is the apparent power VA value, then just remove the 0.65 in the denominator and add it directly.


   (5) The output power factor of the UPS varies with the nature of the load. It is not the nature of the power that the UPS should output to the load, but the nature of the power the load requires. UPS should adapt to load, not load to adapt to UPS.