Introduction to high-frequency modular UPS power supply N+X parallel
redundancy technology. The high-frequency modular UPS power supply is a
redundant and upgradeable system with N+X redundancy. It can be added and
maintained online according to user needs. It is suitable for small and
medium-power UPS products. It meets the requirements of decentralized power
supply and is installed on a standard 19-inch In the cabinet, it can also be
used alone.
The basic function of UPS is to provide high-quality, uninterrupted power
output to the load, but it itself has no fault tolerance. Once a problem occurs,
it will have a great impact. One of the most important means to improve the
reliability of modular UPS is to implement redundancy. Backup. Traditional tower
UPS redundancy needs to be 100%, that is, "1+1" parallel mode. 100% redundancy
means spending twice as much money, occupying twice as much space, power
consumption and other operations and maintenance. The costs have increased a
lot.
Introduction to high-frequency modular UPS power supply N+X parallel
redundancy technology
High-frequency modular UPS power supply products adopt modular design and
N+X parallel redundancy technology. The product capacity covers various power
segments between 20kVA and 160kVA; the internal module adopts a "modular"
design, which not only ensures a compact layout but also The reliability of the
whole machine is increased; a hot-swappable design is adopted between the module
and the cabinet. The UPS has an independent intelligent charging module; the
number of cells in each external battery pack can be selected from 40 to 32
cells.
The "N + If you use the tower machine mentioned above, you will encounter
great difficulties, but you can easily update it with the following one.
Almost all current modular UPS are of high-frequency structure. The
so-called high-frequency UPS means that both rectifier and inverter work at a
frequency of 20kHz or above. Because the human hearing range is between 16Hz and
20kHz. Sounds below 16Hz or above 20kHz cannot be heard by humans. Therefore, a
real high-frequency UPS cannot hear any noise except wind noise. However, due to
some device or technical problems, UPSs with a single unit of more than 100kVA
usually cannot achieve 20kHz.
Basic principles of modular UPS power supply redundant parallel control
The rapid development and widespread application of information technology
has placed higher and higher requirements on the quality and reliability of its
power supply. Multi-module parallel connection to achieve high reliability and
large capacity power supply is considered one of the important directions for
the development of today's power electronics technology. Taking the composition
of communication secondary power supply as an example, it has evolved from the
initial single-module power supply to 1+1 redundancy, and now the N+1 method has
been widely recognized.
At present, the parallel control methods of inverters include centralized
control, master-slave control, decentralized logic control and independent
control without interconnection lines. On the premise that the performance
consistency of each modular UPS is very good, it detects the change of the
output power of the local unit from one cycle to the next, and adjusts the
output voltage phase of the local unit according to a certain algorithm to make
the parallel units The phase difference is adjusted to the minimum value to
achieve current sharing power supply.
There is no need to add additional control modules when forming a parallel
system. Theoretically, any number can be connected in parallel or run as a
single machine. Hot swapping is allowed. All parallel control is implemented on
the main control board. There are almost no changes to other components of the
UPS, and each unit has an internal bypass. Take the parallel connection of two
machines as an example. Under normal circumstances, the two UPSs are connected
in parallel for inverter output. When one UPS is shut down or faulty, the other
modular UPS is used to invert and supply power alone. Only if both UPS are shut
down or faulty, the inverter outputs. When the machine is running, it switches
to bypass power supply.
Benefits of modular UPS power supply redundancy and parallel operation
1. If the total power consumption of the equipment requires a 200KVA power
supply, then dividing it into two 100KVA units is not only not redundant, but
also increases the insecurity of the power supply. In the past, there was a 50%
probability that one unit would be good or bad, but now two units If any one of
the machines is broken, it will cause the good machine to be overloaded and
crash, which will not play a protective role.
2. If the total power consumption of the equipment is within 100KVA, it can
be used as a backup power supply, and the probability of failure will be reduced
from 50% to 25%.
3. Use separate electrical appliances to supply power separately. If one of
them fails, it will not affect the other half, and the probability is still
50%.
The redundant paralleling of modular UPS power supplies means backup. If
one machine has a problem, another machine can be used to improve the
reliability of the system. If your actual load does not exceed 100KVA, you can
use a parallel redundant system. If your actual load is greater than 100KVA, you
cannot use this system. Therefore, the actual load capacity cannot exceed any
one of the two parallel modular UPSs.
In general: The modular UPS power supply parallel redundancy method
generally consists of two or more UPS units of the same power, with the load
evenly distributed. This method is also called the N+1 redundancy method, and
the total power supply provided to the load is The capacity is twice the
capacity of a single power supply. This working method is more reliable than the
single machine working mode and the parallel full load redundant mode. If one of
the UPS fails, it will automatically exit the parallel queue, and the remaining
machines will continue to supply power to the load.
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