A Capacitor Precharging Method for Modular Multilevel Converter Topology
A modular multi-level, topological structure technology, applied in the direction of high-efficiency power electronic conversion, conversion of AC power input to DC power output, electrical components, etc., can solve the problem of reducing the quality of MMC output voltage, output waveform distortion, and increasing hardware costs, etc. question
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[0038] Embodiment: A simulation model is used to verify the correctness and effectiveness of the topology and the control strategy.
[0039] Build an open-loop simulation model of a single-phase n+1 hybrid MMC converter in Matlab / Simulink software, and its equivalent schematic diagram is as follows figure 2 shown. Two half-bridge sub-modules and one full-bridge sub-module are connected in series on a single bridge arm. The output waveform of the traditional MMC is 3 levels, and its power quality is very poor, while the output waveform of the n+1 hybrid MMC is 7 levels, which better improves the power quality.
[0040] The hybrid MMC is used to supply power to the inductive load, and its main parameters are shown in Table 1 below.
[0041] Table 1
[0042]
[0043] In the simulation, in order to simulate the start-up pre-charging process of the hybrid MMC converter sub-module, the DC side voltage increases slowly from 0, and the DC side voltage reaches half of the rated ...
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