Power electronic transformer for alternating current/direct current distribution network
A technology of power electronics and transformers, which is applied in the direction of converting DC power input into DC power output, converting AC power input into AC power output, and adjusting electrical variables. Large load loss and other problems, to achieve the effect of easy expansion and maintenance, fast self-clearing, and increased voltage level
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[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0018] figure 1 Shown is a schematic structural diagram of a power electronic transformer for an AC / DC distribution network, which is characterized in that it includes an input stage, an isolation stage DC-DC converter, and an output stage. The input stage is a modular multi-level converter structure, which is composed of multiple clamped twin sub-modules connected in series, the AC side is connected to the 10kV AC power grid, and the positive pole of the upper bridge arm and the negative pole of the lower bridge arm are respectively connected to 10kV DC The positive and negative poles of the network; the isolation stage is composed of DC / AC modules, high-frequency transformers and AC / DC modules with the same number as the input stage sub-modules, the DC input port is connected to the input stage sub-module, and the DC output port is connected ...
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