Symmetric double cascade DC conversion unit with circulating current reverse self-elimination capability
A DC conversion unit and self-elimination technology, applied in the direction of converting DC power input to DC power output, output power conversion devices, electrical components, etc., can solve the problem of less output harmonics, large transformation ratio on both sides of the intermediate frequency transformer, and switching frequency Low-level problems, to achieve the effect of easy winding, more winding, wide ratio DC conversion
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[0020] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0021] As shown in Figure 1, the symmetrical double cascaded direct current conversion unit with circulating current reverse self-elimination capability according to the present invention is composed of two symmetrical cascaded modules, including the first cascaded module 1 and the second cascaded module 2. The input terminals of the two cascade modules are connected in series, and the input voltage is V in , the output terminals are also connected in series, and the output voltage is V out . The first cascade module 1 and the second cascade module 2 include a modular multilevel inverter MMC1 on the primary side, an intermediate frequency transformer, and a modular multilevel rectifier MMC2 on the secondary side that are sequentially connected in circuit; The AC end of the side MMC1 is connected to the AC end of the secondar...
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