Note : If you are using a variable step size in simulink, then add a zero order hold before each input of sim coupler and insert the sample time same as of PSIM. If you are using fixed step size in simulink then
A symmetric PWM has symmetric waveform when referred from its center. However an asymmetric PWM is the one with no symmetry in the waveform when measured from the center as shown in figure below. In Figure below the Ts represents the switching cycle. In Symmetric PWM the harmonics are low compared with the asymmetric.
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