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Island Power Systems
At present approximately 1.6
billion people are living without a regular electricity supply, the
effects of which include stagnant development and increasing poverty.
Many remote areas with scarcely populated areas are without power
because connecting them to centralised power source would be
uneconomical. Many of these locations are ideally suited to
benefit from the integration of renewable energy: wind; solar and water
power - systems are now possible to allow self-sufficient communities to
generate their own electricity from their local resources.
Because of the distance
involved the easiest way to design such systems is to connect the
various sources of energy and consumers via a common AC bus. This
enables an off-grid to create it's own local grid can be easily extended
to power additional properties or allow the integration of new renewable
generation.
Generation can be sited at
the most appropriate locations and power delivered across long distances
to properties as it is needed.
Both single and three phase
network systems are possible together with systems incorporating medium
voltage transmission to enable power to be distributed over large
distances to properties as it is needed.
Both single & three phase
network systems are possible together with systems incorporating medium
voltage transmission to enable power to be distributed over large
distances to electrify an entire neighbourhood.
Applications include:
Village power supplies
Island power supplies
Hotels & Mountain resorts
Remote farms
Lodges & Cabins
Hospitals & Schools
Telecommunication & Radio stations
Mobile applications 
SMA 'Sunny
Island' Inverters
These
bi-directional inverters give perfect sine wave off-grid electricity
with high efficiency, robust power and outstanding reliability.
With high continuous and surge power ratings they will comfortably
energise most household appliances.
They allow very simple and flexible design of
off-grid systems since different electrical generators and loads can be
connected on either the AC side (using Sunny Boy & Windy Boy
inverters) or directly to the battery using conventional charge
controllers.
Inverters can synchronize with an external grid or
any other generator. Depending upon the current balance of consumed and
generated power the Sunny Island discharges or charges the
battery in order to support the loads. Diesel generators can be
controlled and the Sunny Island can be used in parallel to the
grid to provide back-up in times of power cuts.
Using this system wind & solar generation can be
sited at the most appropriate locations and connected directly to the AC
network using Sunny Boy & Windy Boy
inverters.
This is particularly useful in wind systems as it
allows wind turbines to be sited at long distances from the battery in
order to get the best wind.
A centralised battery and inverter system is employed
yet several different properties or loads can be easily accommodated.
Power from any generators is first supplied to the
loads and any surplus goes into battery charging. If loads increase
power is taken out of the batteries. If batteries become full then the
Sunny Island increases frequency slightly to cause
Sunny Boys & Windy Boys to
back off generation.
If battery becomes low a back-up diesel generator
sets can be controlled to charge the battery.
Sunny Island
inverters allow the creation of an independent 'island' grid network
between different electrical generators and loads to provide power from
single houses up to small villages. Wind & solar generation can be
fed into this grid using Sunny Boy inverters.
The Sunny Island
bi-directional inverter/charger is the central component of this system.
It provides a constant power supply using a 48VDC battery as a buffer store.
Loads and generation can be connected either on the AC
side or directly to the battery. It can also be used to manage loads supplied and control
back-up diesel generator sets if required.
Only one Sunny Island unit
is required to set up an island grid and this includes the load
management and system control.
 With
the Sunny Island 5048 up to four Sunny Island units can be connected to one single phase to give
an output of approx. 20kW. 3-phase island grids can also be
established using three separate inverters, one on each phase. Clusters
of inverters can be used to increase power using the multi-cluster boxes: eg.
Four clusters of three
SI-5048 on a three phase network to give a total of over 60kW of power.
See
Isle of Eigg Project
Using
this system wind & solar generation can be sited at the most
appropriate locations and connected directly to the AC network. A
centralised battery and inverter system is employed yet several
different properties or loads can be easily accommodated.
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