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A multilevel soft-switching DC-DC converter with only one resonant cell for medium voltage conversion is proposed in this paper. Two control strategies for the converter are analyzed and compared. For the proposed converter, all dc capacitors can achieve voltage self-balanced under open loop control. All switches and diodes operate in soft-switching condition without sacrificing reliability. Finally,...
With the rapid development of advanced power electronics technology and photovoltaic power systems, transformerless photovoltaic (TPV) inverters have been widely used due to the advantages in weight, size, efficiency and so on. However, there exists common-mode leakage current in TPV inverters, which should be satisfied the DIN VDE0126-1-1 standard. A novel H6 topology (H6-N) with dedicated modulation...
A staircase modulation strategy based on modified particle swarm optimization (MPSO) algorithm is presented in this paper to solve the key problem of staircase modulation in modular multilevel converter. Firstly, each harmonic of output voltage is analyzed, and the object function is optimized. Then the modified MPSO, which has the merit of high accuracy, was adopted for calculating the switching...
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