Wind Energy conversion

[D.V.Subramanian]

I’m fabricating a permanent magnet generator for a Vertical Axis Wind Turbine. This is expected to give a 3 ph. o/p (vol tage and frequency varying with windspeed) which after F.W rectification is expected to give 30 to 50 volts D.C depending on the prevailing windspeed . Now I have to take the Battery / inverter route for converting this to 220 V / 50 ~ single ph. A.C for domestic use. I’m designing for about 500 watts max.
Is there any method or off-the-shelf equipment to convert the variable frequency and variable 3 phase voltage of the PMG directly to 50 cycle 220 volts A.C skipping the battery charging/ inverter route ?

Subramanian

 

[mess123]

Cyclo converter and Matrix converter are two popular AC-AC converter that eliminates the need to use battery storage and inverter.

 

[karesz]

Hi mess123,
can you give more details pls?
tnx
K.

 

[kimyonh]

I dont known are there any that equipment. But U can rectifer the Voltage of PGM to DC voltage, then use the DC voltage to converter AC voltage, 50Hz. I dont think that its power effective is high.

 

[FvM]

Cyclo converter and Matrix converter are two popular AC-AC converter that eliminates the need to use battery storage and inverter.

These circuits ar meaningful at a high power (MW) level (only). For three phase to single phase conversion a DC bus capacitor is
required as enegy storage anyway, because single phase implies pulsating energy flow. But a DC bus doesn't necessarily require a battery.

In addition, either a 50 Hz transformer or a DC/DC converter is needed to adapt the voltage levels.

 

[tanz_87]

Hi.

I am currently involved with an engineering project that requires the design and implementation of a three phase wind turbine generator.
I was hoping someone could help me with a couple of questions?...

In reference to magnets within the generator what are the equations to calculate the magnetic force (in gauss) given the height, width, length, air gap and N rating of the magnet? ... This online calculator was very useful but I need to know the equations behind it....
https://www.frenergy.com.au/?act=viewinfo&docId=4

Secondly - when talking about coils - does the cross sectional area (used in Faraday's law) include the core (air or ferrite) or does it have to be taken out of the equation? Does the type of core influence the output?

 

[D.V.Subramanian]

Hi Tanz,
I'm not going into equations of magnetic force etc.,for my assembling the alternator for the VAWT. I have 16 magnets ( 8 magnet pairs) One set comes on top and the other set at the bottom and the non magnetic carrying the coils in between. I have followed Piggot's design by having six coils (air core) quasi rectangular placed at 60 deg intervals on an aluminium composite disk . The steel disks (1mm) carrying the magnets ( placed symmetrically at 45 deg intervals) and the disk carrying the coils are on the same vertical axis. The gap between the two faces of the magnet would be around 20 mm including the coil thickness. I'm still in the assembling stage. I'll msg you when I get some result first with manually rotating the alternator shaft at different speeds. Ultimately it is to be friction driven by a bicycle wheel on the axis of the VAWT .
Thanks for the infmn on the frenergy.com site and the calculator.

Subramanian

 

[karesz]

HiTanz,
Hier is a short description...
://practicalaction.org/docs/energy/pmg_manual.pdf
If you're baffled by a wind turbine's power curve, here's how to www.abundantre.com/windpowercurves.pdf
K.