|Table of Contents|

 An over-modulation scheme of SVPWM used in multi-level inverters

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[ISSN:1007-449X/CN:23-1 408/TM]

Issue:
2016年01
Page:
7-13
Research Field:
Publishing date:

Info

Title:
 An over-modulation scheme of SVPWM used in multi-level inverters

Author(s):
 LIU He JIANG Jian-guo QIAO Shu-tong

 ( MOE Key Laboratory of Power Transmission and Power Conversion Control,Shanghai Jiao Tong University, Shanghai 200030,China)

Keywords:
multi-level inverter SVPWM over-modulation simplified two-level

PACS:
TM 46
DOI:
10. 15938 /j. emc. 2016. 01. 002
Abstract:
 In order to improve voltage output capability of the multi-level inverter,an over-modulation scheme was studied,which is an extension of SVPWM for multi-level voltage source inverters. The over-modulation scheme based on two-level simplification algorithm,according to the modulation index mi ( 0≤ mi ≤1 ) ,the algorithm is divided into three modulation modes. They are line-modulation ( 0 ≤mi < 0. 907) ,Over-modulationⅠ( 0. 907 ≤mi < mmax2 ) ,and over-modulation Ⅱ( mmax2 ≤mi < 1) . In mode Ⅰ,the compensation factor λ was introduced to compensate the volt-second lossless in over modulation region. In modeⅡ,switch angle αh was calculated by a simplified wethod called ‘volt-freq’quickly. In each mode,the over-modulation scheme does not need to store data and complex calculation,and it is easy to expand to n-level inverters and applicate the DSP. Simulation and experimental results that pro-vided by a five level NPC /H topology inverter,verify that the over-modulation scheme is fundamental voltage line-gain,low harmonic content and easy to implement.

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Last Update: 2016-03-21