System and method for grouping and pre-charging modular multilevel converter capacitor
A modular multi-level, capacitor charging technology, applied in the direction of AC power input conversion to DC power output, electrical components, output power conversion devices, etc., can solve problems such as large impact currents, achieve simple control, convenient implementation, The effect of reducing power
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[0041] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0042] Such as figure 1 As shown, two modular multilevel converter topology schematic diagrams are given, which include a first modular multilevel converter 1 and a second modular multilevel converter 2, wherein each phase has upper / lower The next two bridge arms, each bridge arm is composed of N half-bridge sub-modules 3SM and reactor L connected in series; Figure 1a The topology diagram of the half-bridge sub-module 3 is given, which consists of two upper / lower power switches (S1 and S2) with anti-parallel diodes and a capacitor C. S1 and S2 are connected in series with capacitor C in parallel.
[0043] Figure 2a A group schematic diagram of the capacitor pre-charging of the first modular multilevel converter 1MMC1 of the present invention is given, and the upper half bridge sub-module 3 of the upper bridge arm of the first modular multilevel con...
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