Control Techniques for the Cascaded and Cross-switched Multilevel Inverter - A Comparison

Abstract

Nowadays, the multilevel inverter has gained huge attention and has become more popularized in high voltage and high-power applications with low harmonics. As the number of output voltage increases, the harmonic content of the output voltage waveform decreases. In this paper, a comparison of cascaded H-bridge and cross-switched multilevel inverters for 7, 9, 15, 21 levels will be carried out. The different control techniques that will be used for carrying out comparisons are space vector pulse width modulation (SPVPWM), sinusoidal pulse width modulation (SPWM), and third harmonic injection pulse width modulation (THI-PWM) respectively. Here, the seven-level inverter is discussed mainly and can be extended to any number of levels.

Keywords

• multilevel inverter
• total harmonic distortion
• sinusoidal pulse width modulation
• third harmonic injection pulse width modulation
• cross-connected
• total standing voltage