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Topic: Thomas Edison vs Tesla (Read 5737 times)previous topic - next topic

TomGeorge

#15
Jan 16, 2014, 02:29 amLast Edit: Jan 16, 2014, 02:32 am by TomGeorge Reason: 1
cycloinvertor  cyclonconverter

Depends what university you went to and what text book (remember them) was your reference.

Tom.....
(PS, Here we will be relying on that Vic/Tas link today, because we have a significant loss in power production at the moment due to a power station failure, and it is going to be 40DegC plus.)
Everything runs on smoke, let the smoke out, it stops running....

retrolefty

#16
Jan 16, 2014, 02:32 am

cycloinvertor  cyclonconverter

Depends what university you went to and what text book (remember them) was your reference.

Tom.....

Got it, but what about the AC to AC Vc DC to AC as applicable to wind generators?

TomGeorge

#17
Jan 16, 2014, 02:37 am
From what I understand, and will clarify when one of their techs comes by.
Each turbine outputs AC, then rectified to DC, all the turbines in the farm supply the DC bus, so no frequency sync needed.
At the terminal station of the farm the converters/inverters convert the DC bus to AC supply, depending on what transmission lines they are connected to.

Tom...
Everything runs on smoke, let the smoke out, it stops running....

retrolefty

#18
Jan 16, 2014, 02:40 am

From what I understand, and will clarify when one of their techs comes by.
Each turbine outputs AC, then rectified to DC, all the turbines in the farm supply the DC bus, so no frequency sync needed.
At the terminal station of the farm the converters/inverters convert the DC bus to AC supply, depending on what transmission lines they are connected to.

Tom...

Ok, but that sounds like standard invertors to convert the DC bus to the AC grid, not cycloinvertor or  cyclonconverter?

68tjs

#19
Jan 16, 2014, 09:10 am
Quote
Some of the super high voltage transmission lines are DC now. To bring DC to the home requires highly efficient DC-DC converters, however. In the beginning, transformers were a very nice way to transform voltages up and down. To do this with DC requires high voltage semidonductors.

Quote
Ther used to be a dc link between england and france to make best use of nuclear plants i think.

In some cases it is difficult to ensure the synchronization frequency and phase in networks.
It is easier to rectify  the AC voltage, transport it as DC and and recreate AC after transport.

In all continental Europe the electrical network is fully synchronized but apparently it is more difficult with some islands even if the frequency is the same.

TomGeorge

#20
Jan 16, 2014, 09:35 am
A cyclo converter works at a higher frequency than the final output frequency.
When you are pumping energy into an AC system you must do it with as little harmonic distortion as possible, these converters are 3 phase devices and the load can not just be regarded as simple, it appears as a very active load.
The current requirements being resistive or capacitive or inductive at anytime the cylco inverter can cope and still produce a relatively clean output and keep in sync.
The switching components used to be SCR but these days IGBT are used as they are easier to control.
Countrywide or continental wide power distribution with AC is a major industry and is not as easy as turning up a generator here and turning another down there to adjust load sharing across the distribution area.

Tom......
Everything runs on smoke, let the smoke out, it stops running....

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