Modeling, Control, and Experimental Evaluation of Multifunctional Converter System

The multifunctional converter system (MFCS) is a special topology of three-phase ac motor drives, which inherently integrates dc-voltage regulation function. First, in order to explain the mechanism MFCS, an average model derived this article. An equivalent circuit developed, explicitly reveals that MFCS cascaded dc/dc converter-dc drive system. Second, inverter's mean duty cycle identified as independent control degree freedom for dc-bus voltage. Then, influence pulsewidth modulation (PWM) on voltage studied. It concludes space vector PWM invalid MFCS. To address problem, zero-sequence injection (ZSVIPWM) proposed and actually sinusoidal case ZSVIPWM. Third, overall strategy includes not only but also closed-loop Finally, comparative experiments with standard are carried out permanent magnet synchronous machine prototype verify these theoretical analyses strategy.