Power spectra of a PWM inverter with randomized pulse position

Random pulse-width modulation (PWM) techniques result in spread power spectra of static power converters, with advantageous effects on the operation of the supplied electromechanical systems. A random PWM technique with randomized pulse position for three-phase, voltage-controlled inverters is described. Closed-form equations for discrete and continuous power spectra of the line-to-line and line-to-neutral voltages of the inverter have been derived and confirmed by experiments. Presented theory opens the way to numerical optimization of power spectra of random pulse width modulated inverters