Active Power Filter in MATLAB: High Ripple vs PSCAD, Reducing Harmonic Distortion

Hi everyone. I am new in MATLAB. I design an Active Power Filter (APF) with constant frequency integration control for single phase application. I having some switching problem. Previously I was using PSCAD software and I achieved a good result with current total harmonic distortion less than 4%. However, in MATLAB I am getting the result but that has a lot of noise or ripple as shown in the figure below.

May I know why this happen and how can I solve it?

Thank you very much.

Hi,

Can you show us your code and the circuit? One implication of this is that the signal is not filtered at all.

the parameter for PI controller is P=0.02 and I=0.1
The V_dc is the DC-link voltage at the DC-link capacitor of the inverter.