Abstract
Multi Level Inverters (MLI) are widely used in the field of industrial applications. By using MLI harmonic contents and Electro Magnetic Interference (EMI) in different power electronics applications can be reduced. Switching function and reduced switching components of MLI are discussed in this paper. Output voltage levels of MLI can be increased by adding up switching components and DC input voltage source. It can synthesize more sinusoidal waveform and it can also improve the output voltage Total Harmonic Distortion (THD) requirement. If we compare MLI with the conventional two level inverters it has advantages such as higher dc link voltages, low EMI and reduced harmonic distortion. But it also has some disadvantages such as required to use more switches, voltage balancing problem, and complex Pulse Width Modulation (PWM) control. To overcome these disadvantages new MLI topologies can be invented to improve the performance with reduced number of switches. In case of MLIs, they are extremely capable of achieving high power quality output voltage waveform and higher power ratings with the help of structures of MLIs. Mathematical analysis and Matlab simulation results are used.
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