An SVPWM Algorithm for a Novel Multilevel Rectifier with DC-Side Capacitor Voltage Balance

The recently proposed novel unidirectional multilevel rectifier, a three single-phase star-connected has the characteristic of having large number DC-side capacitors and complex capacitor voltage balancing control structure under conventional carrier-based phase-shift sine wave pulse-width modulation (SPWM). Hence, space vector (SVPWM) algorithm for rectifier is in this paper, which can quickly balance without an additional structure. Firstly, it divides vectors then determines two basis that synthesize output reference voltage. After that, based on analysis relationship between switching states charge–discharge capacitors, final action sequences redundant are determined according to principle keeping time consistent. Thus, voltages be automatically balanced Finally, simulation experimental results validated feasibility effectiveness SVPWM algorithm. also show improvements current quality, fluctuation neutral point DC-link, allowing further reduction overall volume cost rectifier.