Operation of Naturally Sampled Current Regulators in the Transition Mode

A fundamental component model of current-regulated naturally sampled PWM inverters operating in the pulse-dropping mode is proposed. Analytical and test results are compared for purposes of model verification and regulator evaluation. The results demonstrate the problems with the classical (stationary reference frame) current regulator that occur in this region of operation. In contrast, the synchronous reference frame regulator is shown to have ideal steady-state response in this region.