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Forum Index : Windmills : MPPT Control Methods for Wind Energy
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DaveP68 Senior Member  Joined: 25/11/2014 Location: New ZealandPosts: 292 |
Has anyone come across this paper on Wind Turbine MPPT control systems? MPPT Control Methods in Wind Energy Conversion Systems Makes a very interesting read on the different technologies used. There are realities if you do not accept, will lead to frustration because you will be spending time on wrong assumptions and the results cannot follow! The Dunning Kruger Effect :) |
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SparWeb Senior Member Joined: 17/04/2008 Location: CanadaPosts: 196 |
I haven't seen that paper before, but it is a good summary of the strategies available to accomplish MPPT with wind turbines. They describe different algorithms that allow a "smart" machine to determine the max power point for any set of conditions. Different strategies seem to be employed by different systems. Figure 20 is a typical "lab test" objective, which shows that a change in wind speed is accompanied by unloading of the turbine, but the MPPT system adjusts to a new load setting that quickly brings the blade speed back to an optimal value. For the WT in the example, it seems that Cp=0.47 is the sweet spot. Figure 20 is just a math model; real wind doesn't behave this way, in step changes, but the example does illustrate that there is a 3 second lag between wind speed change and rotor speed change. Which is about fast enough to absorb most gusts, but there are places in the world where this response isn't fast enough. Figure 21 is a bit more realistic, but they didn't feed their algorithm the kind of wind gust front like I sometimes get, which can rise 10 m/sec in just a few seconds. Anyway, the paper is just a discussion and "summary" of current techniques; maybe call it a "white paper". The kind of thing produced by postdoc's polishing their CV's for a new university position. Despite this, it is definitely something you can learn from, and a good find! The writing isn't bad either. Steven T. Fahey |
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| SparWeb Senior Member Joined: 17/04/2008 Location: CanadaPosts: 196 |
Hey, there's a whole book there. Happy reading! Steven T. Fahey |
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