Thanks, but isnt it the loads on a network that determine the power factor.?.....i mean, as you know, if its a non-PFC'd load, then its not going to draw sinusoidal current just because there's a GTI connected in somewhere?.....so i am kind of investigatively saying, why would the non-PFC'd load draw a sinusoidal current just because the GTI has the feature of being a "sinusoidal current source in phase with grid voltage"Control principle of GTI is sinusoidal current source in phase with grid voltage. In practical designs, a voltage feedforward path helps to reduce current distortion
sinusoidal PWM and an H bridge
Thanks, yes...that would, as you know, be the job of the converter which connects to the panels (MPPT)..........the output of that converter would go to another converter which would produce the 400VDC.It must monitor energy transfer continually, because if clouds move in, less power is available from the PV panels. Then the controller needs to be smart enough to shorten the PWM pulses.
The current is determined by the loading:Also, reference GTI's......they have no current control...they cant, because the current drawn from them depends on the loading of the phase.
Absolutely correct. Similar to a PFC rectifier controller, the overall power control can be established through DC link voltage control. But due to the inherent 100 Hz DC ripple of a single phase inverter, DC link voltage control must be slow, otherwise it would generate current harmonics. Respectively a feedforward path from the power source will achieve faster reaction on varying power delivery.The current is determined by the loading:
This should be true for "non_grid_tied_inverters".
For GTIs I expect they need current control, not only for overall power control, but at least for wave shape (sine) control.
As said: not knowledge, just my expectation.
Thanks thats interesting. Supposing we were to produce a sinusoidal AC current in phase with the mains voltage, then that goes a long way to being a grid tied inverter i believe? (excepting all the protections and shutdowns etc). Reading the following makes you wonder what the overall control strategy is...Many GTI's are current control from a ref sine wave, that goes from zero to full ( = 32A pk or whatever ) these GTI's need mains present to shove current into - and were/are never designed to be stand alone ( they can't )
...thanks for this, i see what you mean, the mains is a very stiff source to drive into......very low impedance....so really, it makes it seem like a GTI is actually an easier job than a non-GTI?...since with a GTI, you can just set your error amplifier up to provide a sinusoidal source, and shovel it out into the mains?Many GTI's are current control from a ref sine wave, that goes from zero to full ( = 32A pk or whatever ) these GTI's need mains present to shove current into - and were/are never designed to be stand alone ( they can't )
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