Inverter

Thread Starter

Cerkit

Joined Jan 4, 2009
287
Can someone explain why and active front end (back to back inverter) improves power quality as opposed to usind simple diodes for the front end (rectifier) of the inverter?
 

R!f@@

Joined Apr 2, 2009
9,918
When you said active, I think you should know.
Active takes care of the passive losses increasing efficiency
 

mik3

Joined Feb 4, 2008
4,843
Can someone explain why and active front end (back to back inverter) improves power quality as opposed to usind simple diodes for the front end (rectifier) of the inverter?
It allows a bi-directional power flow which allows for the motor to operate in all 4 quadrants (motoring and breaking). Bi-directional power flow means that when the motor is breaking and the DC link capacitor is charged up, by proper switching of the front end the breaking power is delivered to the grid. A brake chopper could be used but if breaking is going to happen often a lot of energy will be wasted.
Also, an active front end allows for power factor correction by forcing the input current to the converter to be sinusoidal and in phase with the grid voltage.
 
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