DC to AC Inverter Design Difficulty

[Scorael]

Hey Guys,
I'm having trouble designing an inverter to power an ac motor using a fuel cell with MATLAB. With the inverter, the output current of the DC converter dips below 0 and the fuel cell does not like that at all because it causes a 'ln of -ve number' error.

I have tried placing an inductor between the inverter and converter, which works but causes the inverter output voltage to dip about 1000 times way below the required voltage.

So the question is: how do I prevent the output current of the converter from dipping below 0 without stepping down the voltage of the inverter?

Thanks in advance for any help given

 

[berkeman]

Hey Guys,
I'm having trouble designing an inverter to power an ac motor using a fuel cell with MATLAB. With the inverter, the output current of the DC converter dips below 0 and the fuel cell does not like that at all because it causes a 'ln of -ve number' error.

I have tried placing an inductor between the inverter and converter, which works but causes the inverter output voltage to dip about 1000 times way below the required voltage.

So the question is: how do I prevent the output current of the converter from dipping below 0 without stepping down the voltage of the inverter?

Thanks in advance for any help given

Welcome to the PF, Scorael. Are you using an H-bridge inverter to power the AC motor? How are you sync'ing the AC output with the AC input requirements of the motor?

Can you post your MATLAB simulation setup and results? That would make it easier for the MATLAB and simulation experts here to help you with suggestions.