Hybrid MMC starting charging method
A charging method and a hybrid technology, applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of hybrid MMC topology complexity, bridge arm over-modulation, controlled charging current impact, etc., to improve over-modulation and Effects of inrush current phenomenon, increase in capacitor voltage, and stable operation
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[0040] A hybrid MMC startup charging method, hybrid MMC topology reference figure 1 As shown, the hybrid MMC includes three phase units corresponding to the three-phase alternating current, and the three phase units are connected in parallel; each phase unit includes an upper bridge arm and a lower bridge arm in series, and the upper bridge arm includes a series N 1 half-bridge submodules with N 2 full-bridge sub-modules, the lower bridge arm contains N in series 1 half-bridge submodules with N 2 full-bridge sub-modules, N of each upper bridge arm and lower bridge arm 1 The number of redundant half-bridge sub-modules in each half-bridge sub-module is M 1 , N of each upper bridge arm and lower bridge arm 2 The number of redundant full-bridge sub-modules in each full-bridge sub-module is M 2 ;refer to figure 2 shown, including the following steps:
[0041] Step 1: Start the AC side of the hybrid MMC, lock the converter valve; close the AC circuit breaker, and pre-charge...
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