Programmed PWM techniques to eliminate harmonics - A critical evaluation

摘要: Programmed pulsewidth modulators (PWMs) eliminating several lower-order harmonics generate high-quality output spectra, which in turn result minimum current ripple and reduced torque pulsations, thereby satisfying performance criteria contributing to overall improved performance. Several programmed PWM switching patterns eliminate the spectra of single-phase three-phase inverters are possible. Each these leads a specific advantage single- inverters, depending on application. First, superiority techniques over conventional carrier-modulated PWMs is established. Next, critical evaluation schemes basis applications for used provide framework guidelines selection appropriate technique each application area. Evaluation include harmonic loss factor total distortion factors defined at input inverter terminals. Finally, simple low-cost solution obtaining required points proposed. Selected results verified experimentally. >