Closed-Loop V/f Control of Symmetrical 6-Phase Induction Motor Using Cascaded H-Bridge Multilevel Inverter

摘要

This work presents the closed-loop volt/hertz control of H-bridge multilevel inverter (MLI) fed induction motor drive. A five-level MLI generates a stepped sinusoidal waveform with lower level harmonics by raising the levels by which harmonics can further be reduced but results in high switching losses. H-bridge MLI of five-level is feminized by using SPWM. The waveform of output of the MLI is so developed for assuring with minimum THD, and the output is then filtered to get desired sinusoidal waveform. Then, the output is fed into the symmetrical six-phase induction Motor (6PIM), mathematical modeling is done by using a procedure sequence of equations. Induction motor speed control is utilized by controlling the actual speed by making V/f constant. After that PI controller is designed to get the motor speed closer to the reference speed. The method is also called feedback control and is prejudged for several reference speeds and variation in its dynamic speed and load. Comparative estimation of steady-state and transient characteristics based on their performance and efficiency of the system is analyzed for H-bridge fed induction motor drive. The results of the simulation are validated by using MATLAB/SIMULINK-2018 setup.