Wind and bursts too brutal

[darwenn]

Hello everyone, I wanted to share with you an observation this morning on my wind turbine and have your opinions.

This morning the wind is blowing at 40km / h, it's been a while here in the north that we haven't had a wind at this speed. In short, I look at my wind turbine and I see it spinning quickly, stopping dead, regaining momentum turning very quickly, stopping dead, fairly regularly. I really thought of a malfunction of the overspeed brake. I disconnected the wind turbine from the batteries, let it run empty and even noticed. Well I know that it is equipped with a superspeed brake, and immediately I knew that it was he who was involved. But after observation I concluded something else.

The wind blows in a brutal gust, and the acceleration of the wind turbine is too fast and goes into safety. I was quite puzzled and I observed the ammeter. Usually the rise in intensity is quite flexible and regular, there it is almost sudden, 10/15 amps almost at once and presto, the wind turbine stops.

So I conclude that it is better with a wind of 30 kmh flexible and regular, than a wind of 40 which blows in brutal gusts, I am not a specialist in windy phenomena, but for example last week I had a north wind at 30km / h the wind turbine produced very well, and there this week a south wind in gusts, and presto it is the brutal overspeed.

I believe someone on this forum had an air-x 400 wind turbine and had also found it too easily secured. Me, it's an MW400 and I think it's normal, due to the too rapid rise in production. Your opinion ?

[bernardd]

Hello,

Thank you for your comments!

And did you not get feedback on the functioning of the internal brake?

It would take a generator which in these cases imposes a higher load to have a magnetic brake producing energy ...

With slightly more complex speed regulation? Not sure if it is necessary ...

You give the current but not the voltage? What is it?

From memory, you have rectified current and you charge the batteries directly without an intermediate regulator?

[darwenn]

Yes, because the wind turbine already internally regulates the load. I did not measure the maximum no-load voltage before braking, I will try if I have time. Otherwise on load, the voltage being that of the batteries, I cannot see anything on the meter / voltmeter during braking, but I will try an empty measurement.

[bernardd]

It would be very interesting to test with an MPPTn regulator which will naturally seek to increase the load ....

You also need a charging circuit that pulls behind, not that your batteries are full :-) You could possibly put an engine or a heater behind, to test without limiting the batteries ...

[darwenn]

Voila, I did quickly, so when empty, the wind turbine brakes systematically as soon as the no-load voltage reaches 18volts.

My batteries are not full at the moment, I have 12,48 in charge.

[bernardd]

If you discharge well in the batteries, you must be at 14V, or with 15A 220W approximately, is that correct?

Add: 12,48Vx15A = 187W Your wind turbine is given for what power?

It would be necessary to find a 12V load of power higher than the batteries, which you switch on the circuit when the amperage goes up: a manual MPPT in a way :-)

To see if it slows down the wind turbine?

If this is the case, then the MPPT test will be interesting ...

PS: live batteries should not at all appreciate these current peaks .... It is for these situations that conditioning capacities would be interesting.

[darwenn]

No, in fact the 12,48 volts is the voltage of the batteries, to tell you that they are not full, it is not the voltage when the wind turbine loads it, it is the empty voltage of the batteries somehow, in charge it rises gradually and it relapses when the wind turbine stops.

[bernardd]

I fell back on what I had :-) But if you want to have a precise indication of the power, measure current and voltage at the same time.

And if the voltage goes beyond the maximum voltage of lead batteries (memory 14,7 ??) then they will not like.

[darwenn]

No, when charging the voltmeter stabilizes at the battery voltage, or rises slightly above, nothing abnormal.

[bernardd]

No, when charging the voltmeter stabilizes at the battery voltage, or rises slightly above, nothing abnormal.

For how much ?

But even in the current situation, where the batteries are not full, they are the ones that set the voltage of the wind turbine and limit its power, while the wind turbine could go up to 17V and deliver more power ...

By this limitation, you have to lose about 75W on 180W ... and the braking of the wind turbine is less strong than it should, which makes it turn too fast, and locks up earlier ...