this might seem like an odd question, but i consider myself still a newbie in Power electronics. This has been circling in my head for a few days.
From a Hardware Standpoint i am assuming both are similar using a 6 IGBT inverter. DC source is a Battery. The first is driving an AC motor and the second is driving a 3 phase transformer. (I am not concerned with the charging part of the UPS, i am only interested in the DC/AC part aka inverter).
What is the control difference (Assuming both output sinwave) ?
a- Does A UPS system uses feedback from the output voltage to correct the PWM, to compensate for battery draining, or does it use fixed values since the waveform is constant (no voltage control)?
a- Does A UPS system use current control ? In a VFD you can Limit the motor current using V/hz or FOC, and reduce supply voltage, but that might not be applicable in UPS.
b- How does a UPS react to an overload typically ?(turn off or limit output).
by the way for motor control there is large resource (app notes and DEV boards) i cannot seem to find much for UPS systems.