Frequency Stabilizer

[Shuja'at Ali]

Respected All,

I am working on a wind power project whereby my generator is attached with a wind turbine. As the wind speed varies so the frequency of the output of my generator also varies. To be safe I assume that it varies from 30 to 70 Hz. I want to convert it into a stable 50 Hz output so I can drive the household loads with it.

I have thought of designing a Ac to Dc to AC inverter. But i am not sure if it will work.

Please guide me if this solution would work or if you have some better and cost effective solution.

Thank you all.

Best Regards

 

[chuckey]

This is the only way to do it, the DC section must be battery supported. You charge up a battery from your turbine and you run an AC inverter from the battery. Wind speed is extremely variable, without the battery support your AC would be fluctuating wildly.
Frank

 

[Shuja'at Ali]

This is the only way to do it, the DC section must be battery supported. You charge up a battery from your turbine and you run an AC inverter from the battery. Wind speed is extremely variable, without the battery support your AC would be fluctuating wildly.
Frank

I appreciate your reply. Thank you so much.

I want to drive a load of upto 2200 Watts. What kind of batteries should I use?

Kindly guide me for both cases:

- If i want to drive the load only when the wind turbine is rotating.
- If i want to charge the batteries and drive the load.. and also use the batteries later to drive the load

I thought about using batteries ( deep cycle batteries ) but the cost was going too high. Can i use normal batteries?

 

[chuckey]

" If i want to drive the load only when the wind turbine is rotating." The only sort of loads you could use are non fan heaters, electroplating set ups, err, I can't think of anything else. You can not run anything with a motor in it. The reason is that the wind can go from 0 -> 20 MPH and back to 0 in two seconds, so your turbine output will go from 0V to 230V and back to 0V in three seconds.
You can use "ordinary" batteries but if discharged to less then 60% they will have a short life. I would seek advice by others who have done this sort of thing by Googling "wind turbine ".
Frank

 

[Shuja'at Ali]

"You can use "ordinary" batteries but if discharged to less then 60% they will have a short life.
Frank

Please guide me if i have got it right.

I should connect the generator with a Ac to Dc converter and that should be connected with a battery bank which should further be attached with a Dc to Ac inverter which would be further attached with the load.

The load can be anything ( consisting of motors, lights, refrigerator etc ).

But in this case the battery bank needs to be greater than the load and we will only drive the load while the generator is running so that the battery does not discharge less than 60 % .

 

[Shuja'at Ali]

I have found this module. Do you think this will be of any help ?

https://shop.keyboardpartner.de/SWC-50-SQ-frequency-stabilizer

 

[chuckey]

It only provides 25 W of output power. Its of no use what so ever. I would use a 50V battery. So your first step is to design a turbine to DC rectifier, then a PWM converter to step up/reduce the turbine DC to accurately charge the 50V battery. Depending on your design also a AC mains to battery charging circuit. Then a 50 V to AC mains PWM converter. Have you used Google yet?
Frank

 

[Shuja'at Ali]

Yes I have tried googling the solution and I did some calculations. According to my calculations if i use a 48 volt battery (highest voltage available to me) to drive a load of 2200 Watts using the system of ( Ac-Dc-Battery-Dc-Ac ) then i would need a current rating of (2200 Watt/48 volts = 45.83 Amperes). A battery (48 V, 100 Ah ) will be able to drive the load as long as the generator is running and it will give me a stable Ac output as when the wind will not be blowing then the load will drive the power from the battery for approximately 30 mins keeping in view that the battery does not drain below 70 %.

And for this solution we will have to design the rectifier circuit and the inverter circuit based on 48 Volts and 50 Ampere.

Please do correct me if i am wrong.

Thanks alot for your help

Best Regards
Shujahat