AC reversible converter, single phase
AC reversible converter, single phase
(OP)
Hi everybody,
I got this reversible inverter topology from a possible supplier, but don´t understand the AC input side converter structure (single phase, two converters in parallel).
Any help or reference where to check it?
Thanks!
I got this reversible inverter topology from a possible supplier, but don´t understand the AC input side converter structure (single phase, two converters in parallel).
Any help or reference where to check it?
Thanks!





RE: AC reversible converter, single phase
On the left is the three phase rectifier. For reference, read: http:/
In the middle is a DC bus.
On the right are two, three-level, single phase inverters in parallel - one is drawn at the top and the other is drawn underneath. If you're unfamiliar with a (two-level) H-bridge inverter, start there: http://en.wikipedia.org/wiki/H-bridge
To then understand a three-level inverter is not a big step. See here, but note that in the single phase case, only two legs are used, not three: ht
Is there anything more specific that is not clear? I'm confused about your mention of an "AC input side converter". The converter (on the right) is typically thought of as the output. Although, since this is a "reversible" inverter (made possible by controlling the rectifier FETs rather than just using diodes) so power flow can go back the other way.
RE: AC reversible converter, single phase
the link is missing, I found this that suppose that is what you were triying to reference
http://www.pwrx.com/pwrx/app/TLI%20Series%20Application%20Note.pdf
The right side converter in this case is connected to supply through a 1-phase transformer (Railway supply network of 25kV) and is used as reversible, the load is the 3phase side.
One thing that I miss; I get than the converter can "modulate" an AC signal from DC bus to the input side but there I am used to the concept of syncronous generators, and the power injected being function of power angle between the electromotive force and the supply voltage. Here there is not such difference, the converter just generate the AC at the input. is it the transformer impedance that makes the difference between the angles?
Adjoint block diagram to clearify a little the question...
RE: AC reversible converter, single phase
There are variations on this concept with more complicated power flow control methodologies, but this phase angle one is the most common.
RE: AC reversible converter, single phase
RE: AC reversible converter, single phase
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RE: AC reversible converter, single phase