A solid-state transformer with uninterrupted operation under fault conditions and its modulation method
A technology for solid-state transformers and fault conditions. It is applied in the direction of output power conversion devices, AC power input conversion to DC power output, and harmonic reduction devices. It can solve problems that affect the normal operation of solid-state transformers, capacitor voltage deviation, and high protection difficulty. problems, to achieve the effect of improving power supply reliability, optimizing harmonic characteristics, and eliminating sideband harmonic components
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[0045] The following is a detailed description of the embodiments of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.
[0046] Such as figure 1 Shown is a topological diagram of a solid-state transformer according to an embodiment of the present invention.
[0047] Please refer to figure 1, the solid-state transformer in this embodiment includes: MMC sub-module units SM and isolated DC converter units IBDC cascaded with each other. It also includes four types of ports: medium voltage DC port, medium voltage AC port, low voltage DC port and low voltage AC port. The sub-module unit SM of the MMC includes: a half-bridge sub-module HBSM and a full-bridge sub-module FBSM; the ratio of the number of half-bridge sub-modules...
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