Abstract：The loads of cascaded rectifier may be unbalanced at runtime. The DC bus voltages will fail to keep balance when the load balancing degree is beyond a certain range. In this case, the harmonic components of the AC side voltage will increase, leading to the increasing of current harmonic components accordingly. In this paper, the control method based on two-dimensional modulation is studied. Then the modulation waveforms of single-phase two-H-bridge cascaded rectifier are analyzed deeply, and the load balancing limits in which the DC bus voltages are balanceable are deduced from the modulation waveforms. A simulation model based on Matlab/Simulink and a semi-physical real-time simulation platform based on RT-lab are built up. The simulation and experimental results have verified the correctness of the analysis and the conclusion, providing a theoretical basis for the design of transformerless cascaded converter.
郑征, 李绍令. 基于二维调制的级联型整流器负载平衡度限制范围[J]. 电工技术学报, 2016, 31(24): 205-212.
Zheng Zheng, Li Shaoling. Load Balancing Limits of Cascaded Rectifier Based on Two-Dimensional Modulation. Transactions of China Electrotechnical Society, 2016, 31(24): 205-212.
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