Performance Analysis of Three Phase Multilevel Inverter with SPWM Techniques used in Railway System

The medium voltage & high power converters are used in electrical railway system because of its high efficiency. Due to the use of heavy load in the railway system, conventional inverters causes power quality issues such as harmonic distortion, low power factor, etc. In this paper, new cascaded multilevel inverter (MLI) using cascaded H-bridge is introduced. The advantage of the proposed method is to mitigate power semiconductor switches in number which reduces the cost of the circuit as well as the complexity. The analysis and evaluation of various Sinusoidal Pulse Width Modulation (SPWM) Methods with different levels of an inverter has been modeled and simulated by using MATLAB/Simulink.