Grid Interconnection of Wind Turbines Presentation to GERC Ahmedabad 07.02.09 M.P.RAMESH, former Executive Director Centre for Wind Energy Technology GERC posers GERC has put up the following questions: Intra-state grids Interstate regional grid
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Presentation to GERC
M.P.RAMESH, former Executive Director
Centre for Wind Energy Technology
Evacuation – The big picture –
Northern & Southern Grids
Freq - 1
Freq - 2
INDIA CURRENTLY OPERATING AT
“TWO” FREQUENCIES – NORTH & SOUTH
INTER-REGIONAL EXISTING CAPACITIES
INTER-REGIONAL PROPOSED CAPACITIES BY 2011-12
30,000 MW OF INTER-REGIONAL POWER BY 2011 -12
“NO Augmentation” proposed between “Southern & Northern” Grids
SOURCE : CEA
“….. while occasionally the wind slows down in one location leading to decreased output in a particular location (also within the particular pass itself, the wind mills are installed over a radius of 30 to 40 KM), locations with high penetration of wind energy would compensate for the same. As a result, it typically takes much time or even hours for the total wind energy output of a region to change significantly. This makes it relatively easy for the utility system operators to accommodate these changes without relying on the reserves i.e. slowly taking the tag of ‘infirm power’ out of wind energy”.
Though there is much variation, the ramp-up & ramp down happens over several hours
Some forecast results happens over several hours
It may be seen that the general trends are predicted with some degree of uncertainty.
There are issues of input data for such exercises such as outputs of Global Circulation Models. Accuracies of input data for GCMs etc. are again sources of errors.
It is a well known fact that the model outputs will come with uncertainties and validation takes some time, funds and effort.