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06 Nov 09

Samso Energy academy: Renewable, energy, 100, percent, 10, years, island, windpower, offshore, onshore, cooperative

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Galathea 3 EMU Wind Power: Cape Verde - background

"Comparing wind climates in Cape Verde and Denmark from satellite

Wind climates in Cape Verde and Denmark are very different. However, both countries have wind climates well-suited for wind power production.

First of all, the wind climatology in Cape Verde is governed by the trade winds. These are that nearly constantly blowing from the northeast. In contrast, the wind climate in Denmark is characterized by synoptic frontal systems passing from different directions. The wind direction is changing a lot and so is the wind speed.

Secondly, the mountains of Cape Verde gives rise to a much more varied wind resource than is found in Denmark. Denmark is a flat country.

Satellites observe the ocean winds. The SAR-based wind map from Cape Verde (figure 5) is typical for the islands. The wind map is observed from the satellite Envisat. Envisat observes Cape Verde and Denmark a few times per month. Therefore relatively few SAR wind maps are available. The advantage of the SARwind map is the high spatial resolution of 600 by 600 m2. Many small details in the horizontal domain can be seen.

In contrast, the QuikSCAT satellite always observes ocean winds twice per day with a spatial resolution of 25* 25 km2. The mean wind speed for Cape Verde and Denmark observed from QuikSCAT is shown in figures 11 and 12, respectively. The wind data time series covers seven years (around 5000 observations).

Comparing the mean wind speed maps from Cape Verde and Denmark shows winds around 7 to 9 m/s for most of the offshore area. In Cape Verde the highest winds appear in regions with gap-flow between islands in the northwest. In Denmark the highest winds appear in the North Sea.

The monthly mean wind speed for two grid cells with mean wind speed around 8 m/s is extracted and shown in figure 13 and 14 for Cape Verde and Denmark, respectively. It is very interesting to compare the differences in the two figures. For Cape Verde a modest seasonal variation is found. In Denmark, there is a strong seasonal variation with low winds in summer

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Cape Wind Project projects

INFORSE - Projects

" High Penetration of Wind Energy in the Cape Verde Islands
In Cape Verde, electric power has until recently been almost entirely supplied from diesel power stations using gasoil and heavy fuel.
High Penetration of Wind Energy in the Cape Verde Islands

Location
Cape Verde

Responsible
Organisation
Empresa Pública de Electricidade e Água (ELECTRA)
Funding
The Cape Verde and the Danish governments

Project Period
1992-1995

Contact
Name:

Address:

Phone:

Fax:

E-mail:

www:
Risoe National Laboratory
Wind Energy and Atmospheric Physics Department
Att. Jens Carsten Hansen

Building VEA-762
P.O. Box 49
DK-4000 Roskilde
Denmark

+45 4677 5074

+45 4677 5083

carsten.hansen@risoe.dk

http://www.risoe.dk/amv/

Description
Introduction:

In Cape Verde, electric power has until recently been almost entirely supplied from diesel power stations using gasoil
and heavy fuel. This situation changed in 1994 when wind farms with a total capacity of 2.4 MW - called the Step 1
Wind Farms - were installed at the three major island grids as a project jointly funded by the Cape Verdean and the
Danish governments.

Cape Verde has wind energy resources from the trade-winds providing a strong north-easterly flow for most of the
year. Projects since the early 80\'es have documented the technical and economic feasibility of today\'s wind energy
technology for Cape Verde.

Step 1 Wind Farms:

Below are the operation statistics for Step 1 Wind Farms at Sal, Mindelo and Praia power systems average for 3
years 1995-1997:

Island
Sal
Sao Vicente
S. Tiago
Power system
Sal
Mindelo
Praia
Available diesel capacity (MW)
Gas oil
Heavy fuel
Gas oil
Installed wind turbine capacity (kW)
600
900
900
Avg. wind speed at hubheight (m/s)
87.4
10.4
7.8
Annual wind energy production
(MWh)
1440
4390
2500
Annual power system load (MWh)
10120
32800
39870
Avg. wind energy penetration %
14
14
6.3
Avg. wind turbine capacity factor %
27
56
31
Annual diesel fuel savings (t)
340
970
615

Lessons Learned:

Evidence has been provided from the operation of