Modified Multilevel Inverter Topology with Minimum Number of Switches

Addagatla Nagaraju; Akkela Krishnaveni

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25-Dec-23

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Modified Multilevel Inverter Topology with Minimum Number of Switches

Author(s):

Addagatla Nagaraju , Government Polytechnic, Station Ghanpur, Warangal, Telangana, India; Akkela Krishnaveni, Dr. B.R. Ambedkar Government Polytechnic, for Women, Karimnagar, Telangana, India

Keywords:

Voltage source inverter, pulse width modulation (PWM)

Abstract:

Multilevel voltage source inverter is recognized as an important alternative to the normal two level voltage source inverter especially in high voltage application. Using multilevel technique, the amplitude of the voltage is increased, stress in the switching devices is reduced and the overall harmonics profile is improved. Among the familiar topologies, the most popular one is 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, the general purpose of the multilevel inverter is to synthesize a nearly sinusoidal voltage from several levels of dc voltages, typically obtained from capacitor voltage sources. As the number of level increases, the synthesized output waveform has more steps, which produce a staircase wave that approaches a desired waveform. Also as more steps added to the waveform, the harmonic distortion of the output waveform decreases, approaching zero as the level increases. As the number of level increases, the voltage that can be summing multiple voltage levels also increases. These new types of converters are suitable for high voltage and high power application due to their ability to synthesize waveforms with better harmonic spectrum. Numerous topologies have been introduced and widely studied for utility and drive applications. Amongst these topologies, the multilevel cascaded inverter was introduced in Static VAR compensation and drive systems. This project presents a new technique for getting a multilevel output and also uses PWM control techniques. In this technique, the number of switches used for the dc to ac conversion is reduced. So this dc to ac conversion significantly reduces the initial cost. This technique exhibits some attractive features which suits industrial applications. MATLAB/Simulink environment is used to simulate the results. The simulation of the seven-level multilevel inverter is successfully done using pulse width modulation technique. From the simulation, it is noted that the new multilevel inverter topology works well and shows hope to reduce the initial cost and complexity. When we increase the levels, the number of switches used is very less compared to the other topology.