The previous UPS is an online dual-conversion architecture, and the
rectifier and inverter have power losses when they work. Taking a UPS with a
capacity of 60kVA as an example, each KWH of electricity is calculated by 1.2
yuan, and the UPS efficiency is increased by 1%, and the electricity cost is
5045.76 yuan a year. It can be seen that improving the work efficiency of UPS
can save a large amount of electricity for the data center, and it is also the
most direct way to reduce the energy consumption of the entire room. Therefore,
the purchase of UPS should try to purchase more efficient UPS.
Of course, the high efficiency of UPS is not only high efficiency when full
load, but also must have a high efficiency curve, especially in the "1+1"
parallel system, according to the system planning, the capacity of each UPS
shall not be greater than 50%, if the efficiency is only less than 90%, even if
the full load efficiency reaches more than 95%, it is meaningless. Therefore,
UPS must take measures to optimize the efficiency curve, so that UPS efficiency
can achieve higher efficiency at lower loads.
In addition to improving the efficiency of UPS itself, some features of UPS
can also be utilized. For example, ECO economic operation mode, the principle is
that in a good mains environment, activate this function, so that the UPS is
directly powered by static bypass, at this time the inverter is in standby
state, normal work but no output energy, _ Once the mains is abnormal, the UPS
immediately switched to the inverter power supply state, switching time is
generally less than 1 millisecond, because the inverter is in standby state.
Therefore, its own loss is very small, at this time, the overall efficiency of
the UPS can reach more than 1J97%, reducing the loss of more than 3% than the
normal mode.
The use of ECO mode must have two conditions: first, the static bypass must
use two sets of highly reliable thyristors, shall not use the combination of
contactor and thyristor, because the contact point will ignite when the
contactor is suction, and generally cannot work normally after hundreds of
times, while the thyristor does not have this problem, and can shorten the
switching time. Second, it is recommended to use in a better power environment,
such as a first-level power supply unit.
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