DIY Induction Motor / Asynchronous Generator Power Smoothing aka "Flywheel UPS" ?

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cyril7

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#2464625 18-Apr-2020 11:52

Hi, I would suggest your initial post and proposal using a spinning reserve will not end well, you simply cannot control it adequately, YMMV.

Although I have a degree in electrical engineering its a long time since I have dealt with the design and dynamics of spinning reserve systems so in reality a bit out of my area, but honestly just get some beefy online UPS's and be done with it.

Cyril

kenkeniff

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#2464635 18-Apr-2020 12:06

Yes, likewise; I was initially basing the idea off the premise that RPM was relative to voltage as with a DC motor but overlooked the fact it's actually relative to frequency with AC (so the idea may work more straight forward in a DC system).

The fact is Induction Generators are a thing however the question is whether any typical light duty motor would act this manner - and the answer seems to be probably not.

cyril7

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#2464641 18-Apr-2020 12:12

Power systems assume a concept of "The Infinte Bus" and lack of supply will cause the frequency of the entire network to drop, an excess will cause it to increase. So no individual machine is running at anything other than the "Busses" global frequency.

If you put greater "head" onto a machine (ie more water behind it or more fuel on the throttle) then the speed will not change as that is controlled by the mass/freq of the Infinite bus, instead the apparent impedance of that machine falls, and the result is it can/will deliver more current (ie more production) into the network. If it has insufficient head or power to deliver it will slip off the bus (ie drop off totally and loose frequency) and do nothing, or at best just motor.

I know the above is a simplistic view of how the "Infinite Bus" works, but thats the general idea.

Cyril

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