PUBLICATIONS

The nongenerative-boost type rectifier, which is called the Vienna rectifier, is advantageous in terms of efficiency and current total

harmonic distortion. Therefore, the Vienna rectifier is used in grid-connected applications such as telecommunication systems and

wind turbine systems. Owing to the structural characteristics of the Vienna rectifier, various switching methods exist. Among these

methods, a carrier-based discontinuous pulse-width modulation (CB-DPWM) method guarantees high efficiency compared to

continuous pulse-width modulation methods; moreover, it is simple compared to a DPWM method based on space vectors. In this

paper, the performance of the CB-DPWM method, its applicable region depending on the power factor and modulation index (M_a),

and its efficiency are analyzed in detail. Then, based on the analysis, a neutral-point voltage balancing method for the CB-DPWM

method is proposed. The effectiveness and performance of the proposed neutral-point voltage balancing method are verified by

simulation and experiment.