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General
General
General
DC power sources for the Uninterruptible Power Supply (UPS) market
Electrical and electronic equipment used in the advanced information and communications sectors requires a
highly reliable power source. Should a power failure occur, and to assist with continuity of electrical power, it is
standard practice to install an Uninterruptable Power Supply (UPS).
A data centre is where Internet servers and other systems for data communications, such as fixed, mobile, and IP
telephones are installed. At the data centre, AC power from the main system power source is sent to the UPS,
and is temporarily converted to DC power. A storage battery is then charged with this DC power, which is re-
converted back into AC power and then sent to the information equipment.
Photovoltaic power generation
Photovoltaic (or Solar) power generation, which is attracting attention as clean energy, ranges from simple
generation of up to several kilowatts for home use, to larger systems of 100 kilowatts or greater for industrial use.
In the "School New Deal" program, one of the governmental measures during the economic crisis, were for eco-
friendly modifications which advocated the use of photovoltaic power generation at schools. One example is a
power distribution system linked to a source of photovoltaic power generation. The current produced from the
photovoltaic solar cells is sent to a power conditioner via a diode with a DC circuit breaker in a junction box and
then converted into AC, which can then be supplied to a load via a distribution board.
Building and Industrial power back-up
A UPS is typically required for critical power systems in department stores, hotels, hospitals, theaters, and office
buildings. For example, in semiconductor manufacturing plants that feature advanced automation as a part of
their production processes, UPS systems with large battery capacities are used to take measures against any
large-scale power outage affecting critical manufacturing facilities.
Rationalization of use of electric power via large-capacity storage battery
Energy from new power sources such as wind and photovoltaic power generation do not have a stable output. A
lithium ion battery and a sodium-sulfur (NAS) battery can suppress such fluctuations by load leveling. The battery
is charged at night using a lower electrical power rate at night and discharged at daytime when the electrical
power usage rate is higher, and in addition, any new electrical power generated can also be saved. For this
purpose, large-capacity storage battery systems are used at wind and photovoltaic power generation facilities.
The use of these types of systems is expected to grow across all user sectors requiring large amounts of power,
plus as an additional measure against possible power outages.
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