21-01-2021 дата публикации
Номер: US20210021208A1
Принадлежит:
The disclosure discloses a simplified space vector modulation method for multi-lever converters, and relates to the field of space vector modulation methods for multilevel converters, which solves problems that a redundant on-off state is greatly increased along with increase of a number of levels in a traditional SVM technology, and SVM is difficult to realize due to calculation of the redundant on-off state and selection of a proper on-off state. The method comprises the following steps of: step 1: establishing a vector expression; step 2: establishing a reference vector trajectory model; step 3: respectively representing reference signals and level signals by coordinate components of a reference vector and a basic vector and corresponding component sums; step 4: constructing a star-connected multilevel converter; step 5: sampling a phase voltage reference vector trajectory model of the star-connected multilevel converter, and synthesizing the reference vector. 3. The simplified space vector modulation method for the multi-level converter according to claim 2 , wherein:in the first case:{'sub': r', '1', '2', '3', 'β', 'α', 'β', 'α', 'β', 'α', 'α', 'β', 'α', 'β', 'α, 'when the reference voltage vector V′ is synthesized by using V′, V′ and V′ according to volt-second balance principle, the switching states of the corresponding delta-connected multi-level converter are respectively (−v′,v′+v′+1,−(v′+1)), (−(v′+1),v′+2, −(v′+1)), and (−(v′+1),v′+v′+1, −v′);'}{'sub': 1', 'β', 'α', 'β', '1', 'α, '(1) during the duty cycle of the basic vector V′, −v′, v′+v′+and −(v′+1) are respectively used as control signals of a phase AB, a phase BC and a phase CA of the controlled delta-connected multi-level converter;'}{'sub': 2', 'β', 'α', 'β', 'α, '(2) during the duty cycle of the basic vector V′, −(v′+1), v′+v′+2 and −(v′+1) are respectively used as control signals of a phase AB, a phase BC and a phase CA of the controlled delta-connected multi-level converter;'}{'sub': 3', 'β', ...
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