Hello,

I have an inverter design (10kW-200kW) for driving 3-phase motors. As the size of the motor changes, I use different sized IGBTs and different capacitors for different power levels. Currently, I am supplying the DC link of the inverter through batteries to energize the system. In order to make it work through the grid, I want to add a PFC at the DC input of the inverter. So, my question is here. Since the power of the inverter can change, can I use a generic PFC design (say 10kW) and parallel those PFCs to achieve different power levels? For example, for an inverter of 50kW, I will connect 5x10kW PFCs in parallel, and 20x for 200kW. Would this be cost efficient? If so, which topology would be the best for a correction around %96-97? Or should I design different PFCs for different power levels?

Regards,

 

I wasn't aware you could do anything at the DC input to an inverter to correct the power factor. Doesn't it depend on the characteristics of the load?