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- 当桥臂电流为对电容充电方向时,选择投入电压最低的n个子模块, 当桥臂电流为对电容放电方向时,选择投入电压最高的n个子模块。(When the bridge arm current is charged to the capacitor, the N sub module with the lowest input voltage is selected. When the bridge arm current is in the direction of capacitance disc