Master-slave RPWM selective harmonic elimination method for seven-level MPUC inverter unit

The invention provides a seven-level MPUC inverter unit master-slave RPWM selective harmonic elimination method, and relates to the technical field of single-phase inverter pulse width modulation. According to the method, one U-shaped unit in the seven-level MPUC inverter is used as one basic unit, the inverter is divided into three basic units which are connected in series, a master unit and a slave unit are determined, the relation between the total voltage harmonic wave of the inverter and the voltage harmonic wave of each unit is analyzed according to a master-slave structure, and the feasibility of selectively eliminating the harmonic waves is determined; coordination control among the units is realized by using a carrier stacking strategy, functions of the master unit and the slave unit are determined through a unit master-slave carrier stacking RPWM selective harmonic elimination method, and carriers and modulation waves corresponding to the master unit and the slave unit are further obtained. By means