I am working on LCL grid connected Inverter ?

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Rajdeep Banerjee

Please check whether the frequency of noise in the modulation signal is same as switching frequency. If both are same then that frequency component will not reflect on the current.

Kuruva Veeranna

Hi Rajedeep, the frequency of noise in the modulation signal is same as switching frequency is 4khZ. Please find the attached screen shot.

We are unable to test the hardware, reason was modulating signal distorted more(not sinusoidal ), its reaching the saturation (More than 1.5).

1. What is the main reason modulating very bad here, even grid current shape good ?

So, as I mentioned it earlier, if the frequecy of noise is equal to the switchinh frequency, it will not reflect on the current. Please check Nyquist sampling theorem for the theoretical explanasion.

Now, if the control scheme is going to be realized on a digital platform, a sample and hold configuration is needed to be incorporated in the simulation model. It will automatically eliminates the noise