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DaveP68
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Posted: 12 July 2017 at 12:32am | IP Logged Quote DaveP68

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.

Edited by DaveP68 on 13 July 2017 at 8:27am



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SparWeb
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Posted: 18 July 2017 at 3:41am | IP Logged Quote SparWeb

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.

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SparWeb
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Posted: 18 July 2017 at 4:53am | IP Logged Quote SparWeb

Hey, there's a whole book there. Happy reading!

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