Analysis of Harmonic Injection to the Modulation of Multi-Level Diode Clamped Converter in a Normal and Over Modulation Mode
This paper explores the analysis of third and ninth harmonic injection to the modulation of a multilevel diode clamped converter (DCC) at a varying modulation index. The spectral distributions of the various multi-level waveforms obtained under normal modulation index of 0.8 and over modulation index of 1.15 were presented in this work. The contribution of this paper is rooted in the introduction of ninth harmonic component to higher-levels of diode clamped converters with reference to the existing third order harmonic injected modulation with detailed Simulink models of 3rd, 5th and 9th voltage levels. The analysis and results obtained from this work shows appreciable reduction in the magnitudes of harmonic distortion values thus ensuring optimum and efficient devices performance.
Keywords: harmonic injected modulation, spectral analysis, pulse width modulation, diode clamped converter, modulation