Comparative analysis of PWM techniques: Simulation and DSP implementation

The paper presents an overview of the pulse width modulation (PWM) techniques for a feed-forward voltage source inverter. Classical and optimized modulation methods are treated regarding the ease of implementation, harmonic spectra, maximum modulation index and switching losses. Classical PWM procedures like naturally sampled with saw-tooth or symmetrical triangle-carrier-wave, regular sampled and space vector modulation (SVM) or optimized methods like third harmonic reference injection and flat-top discontinuous SVM are simulated using MATLAB-Simulink^® development package. An eZdsp development board was used to implement various PWM strategies on a fixed point DSP and compare their performances.