A SVPWM Method With Reduced Switching Frequency Suitable for High Power Three-level NPC Rectifiers

A Generic Multi-Level SVM Scheme Based on Two-Level SVM for n-Level Converters

“…For a five-level converter, there are 125 voltage space vectors in total. The redundant voltage space vectors have different effects on the performance of the multi-level converters, such as reducing common-mode voltage [15,16], harmonic suppression [17,18], balancing capacitor voltage [19], reducing switching losses [20], conferring fault tolerance [21], etc. Therefore, the redundant voltage space vectors can be selected to achieve a certain objective.…”

“…When other control objectives need to be considered, such as harmonic (THD, WTHD) suppression, reducing switching losses, etc., in theory, the relationship between these control objectives and the variables x and y can also be determined based on the above-presented approach, and these control objectives have been implemented for many other SVPWM methods through selecting the redundant voltage space vectors [17][18][19][20][21]. The identification of these relationships needs to be further researched.…”

“…The converters can be controlled to output the required performance through selecting the appropriate voltage space vectors. Therefore, multi-level SVM has various applications, such as common-mode voltage reduction [15,16], harmonic suppression [17,18], balancing capacitor voltage [19], reducing switching losses [20], conferring fault tolerance [21], etc. However, when this algorithm is applied in converters with higher number of levels, the multiple comparisons still require significant computation resources.…”