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WES18 Hybrid
When sufficient wind is available in a remote, isolated grid, area the WES18 Hybridsystem can reduce energy costs in a spectacular way.
Introduction:Diesel generators are often used to produce electricity in remote areas with isolated grids. Electricity generated in this way is expensive. Besides the purchase price for diesel there are other specific costs that have to be taken in to account. Costs for transport and storage and costs of losses, for example. On top of this diesel generators are not very efficient and will generate about 3 to 4 kWh out of one litre of diesel. As a result the price for electrical energy in isolated grids is high, sometimes up to 80 Euro cent per kWh. On this web page we present total costs overviews of 3 cases.
How does it work: The hardware of the WES18 Hybrid is identical to the hardware of the WES18. Electrical
energy is transferred from the turbine into the wind / diesel grid through an IGBT AC/DC/AC
converter in the control cabinet. The three-phase alternating current generated
by the generator is transformed to a direct current (AC/DC conversion). This direct current is converted back into an
alternating current (DC/AC conversion). The last AC/DC conversion generates an
AC current that is synchronous to the
wind / diesel grid.
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The
difference between the two systems is the software. The WES18 Hybrid
system uses the IGBT convertors to generate frequencies slightly
higher or lower than what the isolated grid is asking for. In this way
the behaviour of the diesel generator is influenced. The diesel
generator will only generate electricity when the WES18 Hybrid system
is not able to deliver enough. On top of this the WES18 Hybrid takes
full advantage of the characteristic of the a-synchronous generator and
the inertia of the spinning parts of the turbine to prevent power gaps.
There is no limitation to the number of Hybrid systems that can be
installed in one isolated grid. WES18 Hybrid systems and WES30 Hybrid
systems can both be used simultaneously in the same isolated grid.
Easy installation:A WES18 Hybrid system fits in a standard foot container or truck and, when lattice towers are being used it can be even installed without a crane. Installing a WES18Hybrid system does not take any longer than installing a WES18.
Scalable:The WES18 Hybrid system can be scaled easily to match your specific growing energy requirements. There is no limitation to the number of WES18 or WES30 Hybrid systems you can combine in one wind/diesel grid, nor is there a limitation to the number of diesel generators in the wind/diesel grid. The diesel generators and the WES Hybrid systems do not have to be installed near each
other, they can be installed (even with step-up and step-down
transformers) a long way apart from each other. The system works as
long as all is connected to the same wind/diesel grid.
Cost effective:The WES18 HYBRID system is cost
effective. The WES18 Hybrid collaborates with the diesel generators
without the need for additional hardware (such as: a flywheel, dumpload,
battery storage, data lines, sensors and central energy management system).
A grid connection is the only connection needed for a WES18 to deliver
energy into the isolated grid and start reducing energy costs.
Example calculations:Below some example calculations. The data used in these cases was taken from calculations we have made for some of our customers using remote, isolated diesel grids.
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(Variables are in bolt) |
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[Dimension] |
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Case 1 |
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Case 2 |
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Case 3 |
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Energy consumption per year |
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kWh |
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1.000.000 |
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1.000.000 |
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1.000.000 |
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Diesel performance |
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kWh / liter diesel |
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2,5 |
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3,0
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3,5
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Diesel losses |
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% |
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10 |
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10 |
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10 |
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Litres diesel needed (Including losses) |
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Liter |
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440.000 |
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314.286 |
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314.286 |
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Purchase price diesel |
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Euro / liter
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0,70 |
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0,65 |
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0,60 |
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Transport costs diesel |
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Euro / liter |
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0,30 |
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0,20 |
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0,10 |
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Storage costs diesel |
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Euro / liter |
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0,20 |
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0,15 |
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0,10 |
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Total yearly fuel costs |
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Euro |
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528.000 |
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298.571 |
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251.429 |
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Costs per kWh
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Euro / kWh |
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0,53 |
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0,37 |
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0,25 |
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Wind speed |
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meter / sec |
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7,5 |
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7,0 |
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6,5 |
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Energy production |
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kWh / year
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256.000 |
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225.000 |
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193.000 |
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Fuel costs saved |
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Euro/ year
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135.168 |
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82.500 |
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48.526 |
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Estimation of payback |
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Years |
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1 to 2
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2 to 3
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3 to 5
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Click here to download a complete description
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