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Each system is unique and its configuration depends of goals - in case when owner is connected to reliable grid and intended just to save some money and maybe sell some electricity, and has not more than 10 panels, then M215 is a good choice.
But if he has not reliable grid, he must have an energy (batteries, for example) storage, a completely different (and much cheaper) of MPPT battery chargers, I would recommend 150 or 300 V strings, and a few cheap synchronized transformerless converters.
And of course he must have some spare converters, batteries and chargers.
And if the goal is just an energy producing, we just throw out batteries and replace cheap chargers with cheap optimizers.
Here will be always lots of questions - for example, (by the way, how exactly) plug strings in parallel or use discrete converter for the each string, how to clean panels in reality, will broken converters just stop energy producing or turn into short circuit, which wires, connectors and insulators will survive climate, where to position converters and other stuff to safe it of lightning, mices, children, how to avoid unnecessary spends, etc. etc. - it is a kind of art.
But if he has not reliable grid, he must have an energy (batteries, for example) storage, a completely different (and much cheaper) of MPPT battery chargers, I would recommend 150 or 300 V strings, and a few cheap synchronized transformerless converters.
And of course he must have some spare converters, batteries and chargers.
And if the goal is just an energy producing, we just throw out batteries and replace cheap chargers with cheap optimizers.
Here will be always lots of questions - for example, (by the way, how exactly) plug strings in parallel or use discrete converter for the each string, how to clean panels in reality, will broken converters just stop energy producing or turn into short circuit, which wires, connectors and insulators will survive climate, where to position converters and other stuff to safe it of lightning, mices, children, how to avoid unnecessary spends, etc. etc. - it is a kind of art.
One reason why the converter is unable to feed the peak current directly is because of its own source (output) impedance limitations. One could consider feed-forward technique to address this problem.
Let me assume that this is Lsource, say it is predominantly inductive. In that case, the feed-forward voltage required to overcome this effect is dff, where
vff = Lsource*delta(Ipk)/deltat
Where delta(Ipk)/deltat is the rate of change of peak current.
dff = vff/Vdcmax
where
dff is the dutycycle required to produce vff
Thus,
Dtot = Derr+dff
Where
Dtot = total dutycycle fed to the switch
Derr = dutycycle from the error controller
Let me assume that this is Lsource, say it is predominantly inductive. In that case, the feed-forward voltage required to overcome this effect is dff, where
vff = Lsource*delta(Ipk)/deltat
Where delta(Ipk)/deltat is the rate of change of peak current.
dff = vff/Vdcmax
where
dff is the dutycycle required to produce vff
Thus,
Dtot = Derr+dff
Where
Dtot = total dutycycle fed to the switch
Derr = dutycycle from the error controller
Tags: Converter, Power supply