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This paper proposes the improved topology and control strategy of three-phase cascaded bridgeless rectifier (CBR) suitable to serve as the rectifier stage for a medium/high voltage multilevel converter. Compared with traditional H-bridge based multilevel rectifiers, the proposed topology adopts much fewer fully-controlled devices, which greatly reduces the control complexity, thus increasing the system...
This paper presents a new unidirectional cascaded bridgeless multilevel rectifier (CBR) well suited for serving as the rectifier stage of a transformerless cascaded multilevel converter. Compared to a traditional cascaded H-bridge rectifier, the proposed CBR utilizes fewer fully controlled switching devices by replacing the fully controlled H-bridge modules with bridgeless PFC modules, thus simplifying...
This paper addresses the optimal design of leakage inductance of the high-frequency transformer in dual active bidirectional converter stages of cascaded bidirectional converters. By the analyzing realization condition of zero-voltage-switching and the method to reduce reactive power under controlling of single phase shifting control strategy, the optimized circuit parameters are selected. An experimental...
In this paper, the relations among the active power distribution, modulation wave and unbalanced loads range are analyzed. A maximum unbalanced loads range is proposed by modifying modulation waveforms under the unity power factor. And a modified staircase modulation, which is easy to realize, is proposed for a single-phase cascaded H-bridge multilevel rectifier to extend the range of unbalanced loads...
The power flow methods used in traditional distribution system will not meet the requirements of distributed generation systems. This paper presents a novel unbalanced three-phase power flow algorithm which fully exploited the special topological structure of radial distribution systems with distributed generation. On the basis of the bath matrix, the sensitivity incident matrix of node voltages and...
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