Patent ID: 11881769
Assignee: THE 13TH RESEARCH INSTITUTE OF CHINA ELECTRONICS TECHNOLOGY GROUP CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A multi-level converter control method applied to a multi-level converter,
the multi-level converter comprising:
at least two switch tube groups connected in series between an external power supply and a LC filter, wherein each switch tube group of the at least two switch tube groups comprises a first switch tube and a second switch tube, first switch tubes of the at least two switch tube groups connected in series forming a first series part, and second switch tubes of the at least two switch tube groups connected in series forming a second series part, and wherein a first end of the first series part is connected to a positive electrode of the external power supply, and a first end of the second series part is connected to a negative electrode of the external power supply;
a flying capacitor connected between two adjacent switch tube groups of the at least two switch tube groups, wherein a first end of the flying capacitor is connected to a common node of respective first switch tubes of the two adjacent switch tube groups, and a second end of the flying capacitor is connected to a common node of respective second switch tubes of the two adjacent switch tube groups; and
the LC filter, wherein an input end of the LC filter is connected to a second end of the first series part and a second end of the second series part, and an output end of the LC filter is configured to be externally connected to a load; and
the multi-level converter control method comprising:
collecting an inductive current of the LC filter within a drive pulse cycle;
determining a to-be-adjusted first switch tube from first switch tubes of the at least two switch tube groups and a duty cycle adjustment amount of the to-be-adjusted first switch tube based on slopes of rising periods of the inductive current, and adjusting a duty cycle of the to-be-adjusted first switch tube based on the duty cycle adjustment amount of the to-be-adjusted first switch tube; and
determining a to-be-adjusted second switch tube from second switch tubes of the at least two switch tube groups and a duty cycle adjustment amount of the to-be-adjusted second switch tube based on slopes of falling periods of the inductive current, and adjusting a duty cycle of the to-be-adjusted second switch tube based on the duty cycle adjustment amount of the to-be-adjusted second switch tube.