LC filter for inverter

Hi,

I am trying to put a dc link converter circuit.The issue is when i use a Dc source as input to the inverter the phase Voltage and current waveform are neat after the filter circuit, by neat i mean i get a sine wave. Now when i connect the rectifier output as input to the inverter the voltage waveform is sine but the current waveform looks distorted. I am using a sine PWM three phase inverter with switching frequency of 10kHz. The output power of the inverter is 60kVa.

Can anyone kindly help me with the issue.

Thank you.

Regards

Raj

[Joel Van Sickel]

Hello Raj,

could you provide a schematic of your circuit when you have the rectifier and dc-link capacitor attatched? Also, could you provide simulation waveforms of the voltage level of your capacitor?

Also, what source do you connect to your rectifier and what is the dc voltage of the ideal source?

[Raj10dbz]

Hi Joel,

Thanks for replying.

I have attached a schematic and output waveform of the capacitor voltage of the DC Link Converter.

Answer 1

[Sivakumar Selvam]

Insert a DC link capacitor such way that it should reduce the ripples in the DC voltage. (say 1%).

[Raj10dbz]

Hi, I have used a capacitor about 5000 micro farad, but then too the output of the inverter is distorted. When I use a dc source instead of the rectifiers output the waveforms are clean , I mean they are sine waveform. The problem occurs only when I connect the output of the rectifer to the input of the inverter.