Closed-loop charging method of modular multilevel converter
A modular multi-level, charging method technology, applied in the direction of electrical components, output power conversion devices, etc., can solve the problem of increasing the impact current during the start-up and unlocking process of the converter, and achieve the effect of simple operation process
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[0012] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0013] see figure 1 , in the charging method of the present invention, the converter monitors the voltage state of the sub-module in real time, and controls the voltage of the sub-module within the rated voltage value or the rated voltage operating range by adjusting the number of cut-off sub-modules.
[0014] With this charging method, the converter does not need to receive system information (whether the constant DC voltage station is unlocked, the island operation of the converter station or network operation, etc.) under different start-up modes of the converter station. Different phases of different start-up processes can stabilize the sub-module voltage at the rated voltage or within the rated voltage operating range.
[0015] When using the closed-loop charging startup method, attention should be paid to the fact that bridge arm overcurrent or submodu...
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