Starting method of modular multi-level flexible direct-current transmission converter
A flexible DC power transmission, modular multi-level technology, applied in output power conversion devices, electrical components, etc., can solve the problem of intensifying the internal dependence of valve control system hardware, high control system resource consumption, and poor operability, etc. problems, to achieve the effect of simplifying the starting method, reducing requirements, and ensuring consistency
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[0025] The specific embodiments of the present invention will be further introduced below.
[0026] The basic topology of the modular multilevel flexible DC transmission converter is as follows figure 1 shown, figure 2 It is a schematic diagram of the sub-module structure. The modular multi-level flexible DC transmission converter consists of six three-phase bridges, each phase bridge consists of two bridge arms, and each bridge arm is cascaded by a bridge arm reactor and several sub-modules. made. The number of submodules contained in a single bridge arm is represented by Nsm. The sub-module is the basic unit of the converter. The topology of the sub-module is as follows: figure 2 As shown in the figure, it includes a DC capacitor, an upper-tube IGBT connected in series with the DC capacitor, and a lower-tube IGBT connected in parallel with the DC capacitor. There are diodes in the upper and lower IGBT tubes in anti-phase and parallel with them, and the sub-modul...
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