As you know, each bus in transmission network is candidate of a large geographic area that may contain more than one wind farm (for example two or more). My questions are exactly as follows:
1) Is there any possibility that the aggregated generation of these wind farms reduce the overall intermitency of wind?
2) How can we model the aggregated generation of these farms on a single transmission network bus? Is there any study or approach for this issue?
maybe this article help you:
https://mitei.mit.edu/system/files/intermittent-renewables-whitepapers.pdf
I would say that intermittency could be model by a probability distribution function of Weibull type that aggregates the effect of several wind farms. For that you migh know the scale and shape parameters for the distribution function. These parameters are normally supplied by metherological studies.
But you could also have several distribution functions acting at once with different shapes and scale parameters, and in that case the best way of simulating the results would be a Monte Carlo Simulation.
Hi Ehsan,
Pooneh and Maria have provided you with concrete approaches to modeling wind intermittency using probability distribution or Monte Carlo Simulation. My focus here is your intention to directly connect these aggregated wind farms to a transmission bus, which I presume could be 400kV and above. In some countries, Tx voltage could be 275kV or even 132kV for small networks. For a systems operation point of view, why would you not prefer to inject that at a lower voltage level into the grid? Your protection settings for voltage fluctuations could be tricky as fluctuations in wind supply could breach your 4-10% tolerance depending on wind penetration levels. In my opinion, the real task will be in your successfully aggregating the wind farms together, processing the power generated and injecting at the designated bus as a voltage-based embedded generator power source rather than as a current source.
I think you are giving a new dimension to renewable energy integration into grid. Till to date it is done only at distribution level. You can stake the reliability of a small distribution system, but can you do the same with a transmission system?...
In my opinion, no one can solve the issue of intermittency of the wind by aggregation. Please see figure 12 of the following report.
http://windmonitor.iwes.fraunhofer.de/opencms/export/sites/windmonitor/img/Wind_energy_report_2011.pdf
You have to deploy huge amount of wind turbine in wide area to overcome the intermittency. It means huge amount of surplus energy in the most of the time.
Instead, following my paper describes the different approach to the same question. It is free to download.
http://www.sciencedirect.com/science/article/pii/S0960148115003079
Thanks Toru for the valuable papers and information. Quite a novel approach. Wind energy cannot be used as base load indeed.
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