Hello! I have been looking into an off the grid plan, but not using any batteries.
I am planning to use micro hydro, wind, solar and instead of batteries I will be using flywheel storage technology. Flywheel storage technology is connecting a motor/generator to a flywheel, to recharge you turn on the motor, and then to use the energy you use the inertia of the flywheel.

Basically we need to synchronize the AC power from the generator in the micro hydro system, the generator in the wind turbine, and the generators in the flywheels, and the power from the inverter that’s connected to the solar panels. Is it possible to use 1-phase generators, since this will be a home system and I will only need 1 phase, or should I use 3-phase, and how would I split those three phases.

What are asynchronous generators and how do they work?

P.S. Does it make a difference of what frequency I am using, besides the fact that some stuff won’t work on one frequency or the other? If yes, what would be the difference between a 60 hertz and a 50 hertz system.

Thank you very much for your time.

Please do not comment on my decision or anything, I just want an answer.
Also, the wind turbine is not necessary, and if possible, I would like to not use rectifiers and inverters.
There probably will be a small biogas generator operating too. It will run at a constant speed. I can regulate the water flow.
I will start up the entire system at the proper frequency with a small generator (from the store) and then let it go on it’s own. Will that work, instead of connecting to the grid?

You can have a single phase power system. As a matter of fact it would be better when you have a dc solar and inverter system.

To synchronize a power system you have to match frequency, sequence, voltage and phase, slowly.

Asynchronous generatros are induction motors which are driven past their synchronous speed and start developing a braking torque and supplying power into the grid. They need to be excited by the grid, but difficult to run off the grid.

50 or 60 hz choice: I would pick the one that is cheaper.

From the level of your questions I take it you have NO CLUE of what you are getting into. Nothing of what you are trying to do is easy, nor simple, nor cheap, or necessarily feasible.
—————————————
The more systems you have, i.e., biogas, solar, diesel, batteries, and so on, the more maintenance tweaking and tuning you wil have to do. Even a simple diesel generator has its quirks. It will be a full time job.

Then, you have to make them work together. On the grid! It can be done, but it is a very tall order. In the end, you will kick the whole pile of junk sky high and get an of-the-shelf system.

Of all the options, I prefer wind, with batteries and single phase inverter. Wind ain´t cheap, and it is noisy, but it is cheaper and simpler than other options, and you can connect to the grid.

"Micro hydro" (not sure how big that would be) will still require some kind of a dam. Not easy to operate either.

Use biogas just for heating and cooking.

Even so, you will have your hands full.
.

.