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Battery storage to create stable micro grids

Remote power generation

In many areas it is not simply to plug into the wall outlet and have electricity. Very often on islands and in remote villages or industries, connecting to the main grid can be very expensive or even impossible.

Electricity often comes from diesel generators. This, however, requires a stable and expensive supply of diesel fuel, and involves high maintenance costs. The result is electricity production that is 4 to 10 times more expensive than in other well-supplied areas – as well as being noisy and polluting.

Renewable energy sources

In this context, solar and wind energy are rapidly gaining ground in these applications as their costs have declined steeply.

These sources of energy are dependent on nature: clouds cause the output of a solar plant to decline rapidly, for example an increase in wind speeds results in a sudden surge in the output of the wind turbine. In this regard, Leclanché’s Lithium Ion-based battery storage systems act as a stabilizer in a microgrid system, with their ability to constantly absorb or inject power from and to the system

High power Lithium Titanate storage solutions

Leclanché’s Lithium Ion Titanate Oxide (LTO) battery storage systems are capable of charging and discharging at a very high speed, thus providing optimal power to the system.

This solution is ideal for large-scale applications with a high load during both day and night (e.g. a 24/7 remote mining operation). Here, the energy required at night is significant. A solar PV system provides energy during the day and the battery copes with variations in load and supply by rapidly absorbing and injecting power. When the battery charge drops below a set level, there is sufficient time to start up the diesel generators to assure stable supply at night.

High energy Lithium Graphite/NMC storage solutions

When a microgrid is providing energy for a smaller load and the consumption mainly occurs during the day (e.g. a factory shuts down at night) or at the fringes of the day (e.g. a small village) it makes more economic sense to run the entire energy supply from renewable sources and batteries. The solar plant will charge the batteries during the day and at night the battery supplements the energy produced by a wind turbine.

For such applications, Leclanché offers its Lithium Ion Graphite/NMC solutions, which have very high energy density and allow efficient storage of energy for night time use while providing system stability.

Reference

Graciosa, an island grid in the Atlantic Ocean.

Graciosa is a small island belonging to the Azores, 1,300 km off the cost of Portugal. 4.500 people live and work on Graciosa every day, running their businesses and going to school and work.

Their electricity needs are currently covered by diesel generators. Consumption is over 13 GWh per annum and they need 2.5 MW of (peak) power, which is expected to increase over time.

This is an ideal example of a small island grid where Leclanché built a battery plant that will combine with a solar plant and wind farm to provide the majority of the energy to the inhabitants of Graciosa during the year.
Graciosa case study page