Modulation method of three-level converter and three-level converter

The invention provides a modulation method and a control method of a three-level converter, and the modulation method comprises the steps: projecting a reference voltage vector in a three-phase staticcoordinate system, and respectively obtaining three-phase voltage instantaneous values; calculating voltage vector action time according to the three-phase voltage instantaneous value; calculating asector area correction amount according to the vector action time; calculating duty ratio correction according to the vector action time and the sector area correction; and respectively calculating three-phase duty ratio values according to the duty ratio correction amounts. Through a simpler calculation process, the modulation effect the same as that of a traditional SVPWM modulation method can be obtained, sector area judgment, a large amount of trigonometric function operation, table look-up operation and other content are not included, the higher operation speed is achieved, and the real-time performance of a digit