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A transformerless converter which is suitable for multiphase drive system application is presented in this paper. This topology employs a cascaded H-bridge rectifier as the interface between the grid and multi inverters which drive the multiphase motor. Compared to the conventional structure, the new topology eliminates the input transformer and also has the advantages of using this topology are four...
In this paper, analysis of the stability in two-cell cascaded H-bridge (CHB) rectifier is presented. The stability problem is caused by the couple controllers which are used to balance the DC-link voltages of each cell. The analysis is carried on by phasorial diagram method and general conclusions about the stable area are derived. Based on the conclusions, the stable area is continued to study for...
In this paper, a novel algorithm is introduced for DC-link voltage balancing in cascaded H-bridge rectifier. With this method, the modulation index of each cell can be regulated by surveying not only the total DC voltage but also each cell's DC voltage, therefore the modulation index of each cell can match their individual actual active power respectively and achieve the DC voltages balance. Furthermore,...
Cascaded H-Bridge rectifier (CHBR) is a more attractive solution in traction application for its transformerless structure. Because of the currents of different cells are exactly the same one, it is a challenge job to regulate the voltages of cells with only one current controller. In this paper, a PI-based control scheme is presented to deal with the voltages balance issue in CHBR. To satisfy the...
In this paper, a novel control scheme for cascaded H-Bridge rectifier (CHBR), which can be used as the primary end of high voltage high power multilevel converters, is presented. The controller is similar with the one for single phase rectifier. To improve the performance of the controller, notch filter and proportion resonance (PR) controller are employed and the discrete methods for them are discussed...
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