Comparison of Current Controllers for a Five-level Cascaded H-Bridge Multilevel Inverter

The hysteresis current controller provides excellent dynamic performance, whereas the Proportional-Integral controller provides instantaneous current control and wave shaping, fixed inverter switching frequency resulting in only known harmonics. A comparative study between Hysteresis current control and Proportional-Integral (PI) current control using sinusoidal pulse width modulation (SPWM) techniques for a five-level cascaded H-bridge multilevel inverter is presented in this paper. A comparison has been made in terms of total harmonic distortion (THD) level at the three phase load current. The simulation study has been carried out with the help of MATLAB Simulink software and the performance of such controllers has been observed during load variations.

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