07-01-2013, 01:20 PM
In this work a study of 21-level inverter using less number of switches as compare to the technologies previously developed. MATLAB software is used for simulate the 11-level inverter. Multilevel inverter is fulfilling the requirement of heavy-duty electric and hybrid-electric vehicles (EH’s) of large electric drives (>250KW). When we increases the level of inverter then we gets the high output voltage and the stress of each switch is also reduces means each switches faces low value of dv/dt. The output waveform of multilevel inverter follows the sinusoidal waveform hence the harmonic contents are less. Therefore there is small loss of energy in the circuit if we study the cascaded multilevel inverter. It exhibits several attractive features such as simple circuit layout, less components counts, modular in structure and avoid unbalance capacitor voltage problem. However as the number of output level increases, the circuit becomes bulky due to the increase in the number of power devices. In this project, it is proposed to employ a new technique to obtain a multilevel output using less number of power semiconductor switches.
The objective of this paper is to make the easy cheap and good multilevel inverter with less number of switches and understanding the working and simulation of a 21-level with the proposed converter topology using less number of switches by PWM technique using MATLAB/SIMULINK software