Flexible straight submodule

The invention relates to the technical field of direct current transmission, in particular to a flexible direct current submodule. The flexible direct current sub-module comprises a capacitor module, an IGBT valve section, a diode valve section and a laminated busbar, the IGBT valve section and the diode valve section are arranged side by side and located on one side of the capacitor module, electrodes of the IGBT valve section and the diode valve section are arranged opposite to electrodes of the capacitor module, and the laminated busbar is arranged between the capacitor module and the IGBT valve section and between the capacitor module and the diode valve section. The laminated busbar comprises a valve section connecting laminated row used for connecting the electrodes of the IGBT valve section and the diode valve section, a capacitor laminated row used for connecting the electrodes of the capacitor module, and a middle transition laminated row used for connecting the valve section connecting laminated row