Module grouping-based full-bridge MMC (Modular Multilevel Converter) simplified space vector modulation method

The invention discloses a module grouping-based full-bridge MMC (Modular Multilevel Converter) simplified space vector modulation method, which specifically comprises the following steps of: firstly, dividing an MMC system into a plurality of virtual subunits, respectively selecting a submodule from different side bridge arms of each phase, enabling the positions of the submodules to be arbitrary, and forming a virtual subunit by the selected six submodules; for the virtual subunit, selecting a proper action voltage vector and a redundant switch state thereof according to an operation interval and a phase current direction of a phase reference voltage vector; vector selection modes of adjacent subunits are the same, but carrier waves of the subunits need to be subjected to mutual phase shift by an angle of 2pi/n. The method does not need a complex calculation process, guarantees the good output performance of the system, reduces the switching frequency of a device, and improves the operation efficiency of the