The selection of frequency modulation mf for single-phase and three-phase inverters depends on the application requirements. In general, the frequency modulation index (mf) is selected based on the desired harmonic content of the output waveform. For single-phase inverters, the mf value is usually selected between 0.7 and 0.9 to achieve a low harmonic distortion in the output waveform. For three-phase inverters, the mf value is typically selected between 0.8 and 1.0 to achieve a low harmonic distortion in the output waveform. However, the selection of mf value also depends on the type of modulation technique used, such as sinusoidal pulse width modulation (SPWM) or space vector modulation (SVM) 12.