problem with the power curve

[Max Vega]

Hi! I just registered on the site. I have a problem with the configuration of the inverter power curve of my Kliux Zebra vertical axis wind turbines, the inverter is a single-phase GCI-2G-W. The initial configuration of the inverter's power curve is 70 volts - 120 watts, when the configuration is done the wind turbine only produced about 60 watts. The wind turbine moves very slowly as if the curve is too high and the turbine does not produce 120 watts at that slow speed. If you could help me with the configuration of the power curve I would be very grateful to you

[Rob Beckers]

Hi Max,

It's tough to make a decent MPPT curve for a VAWT just based on measurements. They tend to be all over the place, depending on how aerodynamically sound they are.

You can certainly change the Voltage-Power points as you see fit. If it's not coming up to speed at low wind speeds just lower the power output for the lower Voltage point a bit. I would suggest small changes, something like 15% at a time, and see how it goes.

Ultimately, the only real way to get an optimized MPPT curve is to install an anemometer that measures wind speed at the rotor, and log both wind speed and power output. When plotted that gives you the power curve of the turbine (wind speed vs. power output) and that is what you want to maximize; the most power for every wind speed. By shifting the MPPT through a range of values and determining the power curve for each it will be pretty clear in which direction things need to move to optimize output. That is what the manufacturer should have done. It shouldn't be left to the customer...

-RoB-

[Max Vega]

The nominal power of the wind turbine is 1800 watts at a starting speed of 3.5 m / s with a maximum rotation speed of 70 rpm

[Rob Beckers]

Max, at 1800 Watt what is the DC output Voltage, and at what wind speed is this?

[Max Vega]

The output voltage is 310 volts at a speed of 20.5 m / s

[Max Vega]

http://www.kliux.com/productos/aerogenerador-de-eje-vertical/

This is the wind turbine link, it has a sweeping area of 6 m2

[Rob Beckers]

Max, here is an MPPT curve based on those numbers:

Wind (m/s) RMP DC Volt Watt Out
5 17 113 0
6 21 134 11
8 28 175 78
10 34 212 188
12 41 248 351
14 48 281 576
16 55 312 873
18 62 340 1252
20.5 71 373 1856

This assumes a piss-poor efficiency of just 7.3%! No idea how accurate this is, for the swept area it seems 1800W at 20.5 m/s wind speed is too low, but who knows.

-RoB-

[Max Vega]

Thank you very much Rob, today I will install it in the inverter

[Rob Beckers]

Did it work Max?