Direct synchronized continuous and discontinuous PWM based on algebraic approach

Abstract

This paper describes two developed versions of direct synchronized pulsewidth modulation (PWM) of output voltage of converters, based on one-stage closed-form strategy of PWM with pure algebraic control dependencies. It is applied to voltage source inverters with continuous scheme of digital PWM for control at low/middle fundamental frequencies of adjustable speed drive systems, and changed to a discontinuous scheme of synchronized vector PWM at higher fundamental frequencies of the drive system. Simulations give the behaviour of PWM techniques proposed.