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I recently bought a wind turbine electric brushless generator rated for 3kW. I noticed that the output voltage is really high - it is around 700V at 5400 RPM. After some research on stackexchange, I found out that using a 3 phase rectifier with a DC-DC flyback is one efficient way to achieve my goal.

  • Is there any better solution?
  • Would this setup guarantee a stable output voltage with variable current or is it more common for such a wind turbine to attach 3 transformers to each phase and convert it directly to 230V AC?

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  • \$\begingroup\$ It depends on the load current. \$\endgroup\$
    – Andy aka
    Commented Sep 8, 2020 at 17:46
  • \$\begingroup\$ How fast will your wind turbine be driving it? \$\endgroup\$
    – user16324
    Commented Sep 8, 2020 at 17:54
  • \$\begingroup\$ Please clarify what your intention is. In the title of your question you mention conversion to low-voltage DC, but in these comments you are now thinking about grid-tie inversion (which will involve a high-voltage DC stage followed by a separate grid-tied inverter). If you don't make a decision this question may get closed for being too vague. \$\endgroup\$ Commented Sep 8, 2020 at 19:49
  • \$\begingroup\$ Wind is variable \$\endgroup\$ Commented Sep 8, 2020 at 20:23
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    \$\begingroup\$ Transformer down to 230 Vac and use a commercial off the shelf AC/DC converter. \$\endgroup\$
    – winny
    Commented Sep 8, 2020 at 21:19

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Is there any solution better than a 3 phase rectifier with a DC-DC flyback?

As Andy aka commented, this depends on the load.
In the kW range, a forward converter looks more attractive.

For a none-too-wide range of voltages, an off-the-shelf power supply or battery charger looks an attractive option.
If not specified for operation from DC as well as from AC, contact vendor - I don't imagine there is a problem running off a 6 pulse rectifier with pulses 10 ms apart at most.
Alternatives to a transformer to get into the component's range of input voltage include a mechanical gear at the generator's input - 5400 RPM is a lot, even 1774 for 230 V.

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  • \$\begingroup\$ (OTOH, I get 5/7 of rated stall torque at 5400 RPM for 3 kW.) \$\endgroup\$
    – greybeard
    Commented Jan 16, 2023 at 6:10

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