By SHE you avoid the generation of low order voltage harmonics. This is specially sought in medium voltage drives where your switching/sampling frequencies are low to avoid harmonics draw the electrical machine.

Lower order harmonics can be eliminated by careful selection of angles thereby reducing filter size requirement and consequently cost.

We can eliminate the particular order harmonics. Using this, the LOH is shifted to higher level. It is easy to filter the higher order harmonics because it requires small size filters.

Fundamental switching is can be done which reduces switching losses. so inverter efficiency is also improved

Furthermore, using SHE it is possible to eliminate motor's low order torque harmonics by current harmonics control.

Any selected predominant lower order harmonics can be eliminated which are considered as more problematic. Also SHE PWM is a fundamental switching process which cause lower switching losses improved inverter efficiency.

It is a known fact that the lower order harmonic are the dominant harmonics in the electrical system. Therefore, if we eliminate the dominant order harmonics through selective harmonic elimination (SHE), the total harmonic distortion (THD) will get considerably reduced.

Fundamental switching is performed in SHE PWM. so switching losses are also minimum