Hi,

I am facing a problem with my Wind Turbine.
It is a 3kW 3Ph 0-380VAC PMG VAWT.
The thing works in the present configuration.
But only when the Sun shines. lol

I have Solar Panels powering the lines in on the Inverter max. 220VDC. + Blocking Diode.
On the same Line the Rectified Voltage from VAWT.
The Inverter is a Wind Inverter PVI 3.0 OUTD-W. So no issues.

So when the Sun is up. I have a very low and efficient start-up.
The VAWT spins up and relives or adds to the load from the Solar side.
All good...

My "Problem"
When the Sun is gone. The VAWT has issues starting up, because of the initial Inverter start-up. Is about 50VDC @5% there of.

I would like to have Isolated the Turbines PMG. As well, a conditional Voltage sensing Contactor set at (or variable)
~75VDC or equivalent AC trigger point. An SSR 3 Ph Contactor would be superb. But how to control it from HVDC.

The Transformer idea would be the easiest. But the start and load Freq. is very low ~3-30Hz. So this kills the Tansformer idea???? or does it????

The DC idea is a dangerous. To step down from 200+ VDC safely is beyond my budget. Especially due to the wild Voltages /Transients.
A true investment risk; if you ask me.

I wish to control a 3Ph SSR Contactor with 24VDC at a cut-in voltage of (variable) ~75VDC or equivalent AC.
This will allow the Turbine to spin up, to supply the Power needed to power up the Inverter.
But at the moment, the Inverter cuts in too soon, to Power up; that is. The Inverter does not dump a load to the
Grid before ~160VDC.

Attached is a general Graphic of what I have. As well a Pic.
The other Graphic is the load curve that functions quite well. When the darn thing is already running.

Can you help me out. Or set me on the right track???

Thanks
Rob Brooks