Study of Five-Level Inverter SHEPWM Control Technology Based on Walsh Function

Abstract:

SHEPWM technique applicable to multi-level voltage inverter via Walsh function can be solved by linear equations instead of nonlinear transcendental equations. This method don't need a large number of initial values, it’s suitable for online calculation because of its advantages such as high speed calculation and high-accuracy. For the traditional SHEPWM technique based on Walsh function has modulation index restricted problem. This paper proposes a multilevel SHEPWM technique, which Combined Walsh function with multi-band modulation technique. Through the analysis of multi-level multi-band SHEPWM voltage waveform based on Fourier series transform, summarized the multi-level multi-band SHEPWM nonlinear equations when modulation index changed from 0 to 1, and solved the problem with on-line control calculating and modulation index expanding by Walsh function transform. Take five-level inverter as an example, according to the values obtained and considering some equations have several solutions under certain modulation index, using the MATLAB/SIMULINK software do simulation research. The result confirmed that the multi-level multi-band SHEPWM technique based on Walsh function transform is correct and practical.

• Periodical: Advanced Materials Research (Volumes 986-987)
• Pages: 1273-1276
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.986-987.1273
• Online since: July 2014
• Authors: Song Li*
• Keywords: Five-Level Inverter, Multi-Band, Selected Harmonic Elimination, Walsh Function

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