Design and analysis of Z-source based 7 level cascaded multi level inverter for induction motor

摘要

Multilevel inverter, a powerful electronic device capable of supplying desired alternating voltage level, is a renowned device majorly employed in appliances such as UPS systems, huge drives of induction motors as well as Transmission Systems. Multilevel inverters acquires the wanted output of their voltage from varied DC voltage sources. Thus, the number of DC voltage sources is directly proportional to the level of output voltage procured by the inverter. Multilevel inverters are constituted with several major advantages like, better harmonic performance, lower semiconductor voltage stress, lower Electro Magnetic Interference (EMI) and diminished losses on account of switching. However, in spite of these, their output voltage runs in accordance with the input from DC sources. Hence, to avoid such limitation there is requirement for an intermediate DC to DC converter in order to boost the working of the MLI output voltage. Thus, in accordance with the above limitation, a seven-level cascaded Z-source based multilevel inverter is proposed for this task. MATLAB/Simulink power system toolbox has been employed for the proposed system, in consequent of which experimental findings are analyzed to attest the efficiency of the method.