Design and Implementation of Three-Phase Multilevel Inverter

Multilevel inverters are gaining popularity in high power applications. It has many advantages like low switching loss, high dv/dt stress, low THD. But it has also disadvantage like for higher level required more switching devices, huge size, high cost. This project proposes a new lad

Project Title

Design and Implementation of Three-Phase Multilevel Inverter

Project Area of Specialization

Electrical/Electronic Engineering

Project Summary

Multilevel inverters are gaining popularity in high power applications. It has many advantages like low switching loss, high dv/dt stress, low THD. But it has also disadvantage like for higher level required more switching devices, huge size, high cost. This project proposes a new ladder type structure of cascaded three-phase multilevel inverter with reduced number of power semiconductor devices which is used to drive the load. The ultimate aim of the project is to produce multiple output levels with minimum number of semiconductor devices. This project uses only 11 switches along with 3 diodes and 4 asymmetrical sources to produce an output voltage of 21 levels. The modulation technique plays a major role in commutation of the switches. Here we used Arduino as a controller for generating required pulses which in turn produces the commutation signals of the proposed multilevel inverter.  The mathematical modeling of the proposed circuit is done using Simulink. The effectiveness of the proposed system is proved with the help of simulation as well as by hardware implementation. The simulation is performed in MATLAB/Simulink. From the simulation results, it shows that the proposed multilevel inverter works properly to generate the multilevel output waveform with minimum number of semiconductor devices.The performances of Arduino as a controller are evaluated using the results which indicate that with the help of Arduino we can easily control our circuit with ease and in more efficient manner. The major advantage of this proposed inverter ends in diminished size, lesser loss, along with low installation cost, and it is suitable for high power applications.

Project Objectives

The main objectives of this project is to produce multilevel output with minimum number of power semiconductor devices for generating multilevel output voltage waveform.The outcome of this proposed inverter topology will results in diminished size, lesser loss and lower installation cost.THD in the output waveform of the proposed inverter will be low. Therefore, it is reasonable for medium voltage and high-power applications. Software and Hardware simulation result will prove the effectiveness of the proposed inverter which will use less number of power semiconductor devices compared to the conventional one.

Project Implementation Method

This project deals with the initial design approach of  3-phase Asymmetric cascaded H-Bridge 21- inverter and the simulations of the proposed design is carried on  MATLAB simulink. The proposed model uses only 11 switches and diodes with four asymmetrical voltage sources to 21 levels in the output voltage waveforms. The main inverter produces only positive voltage of levels 1 to 10. The auxiliary inverter converters it positive ten levels, negative ten levels along with one zero level to produce an output of 21 levels at their output voltage.The proposed multilevel inverter generates three levels AC output voltage with the appropriate gate signals design. Finally, a prototype multilevel inverter with input DC voltage is applied and output 3-phase voltage440V is implemented.

Benefits of the Project

The proposed asymmetric cascaded multilevel inverter produces multilevel output with minimum number of power semiconductor devices for generating Twenty-one level output voltage waveform.The outcome of this proposed inverter topology will results in diminished size, lesser loss and lower installation cost.THD in the output waveform of the proposed inverter will be low. Therefore, it is reasonable for medium voltage and high-power applications. Software and Hardware simulation result will prove the effectiveness of the proposed inverter which will use less number of power semiconductor devices compared to the conventional one.

Technical Details of Final Deliverable

The proposed model uses only 11 switches and diodes with four asymmetrical voltage sources to 21 levels in the output voltage waveforms. The main inverter produces only positive voltage of levels 1 to 10. The auxiliary inverter converters it positive ten levels, negative ten levels along with one zero level to produce an output of 21 levels at their output voltage.The proposed multilevel inverter generates three levels AC output voltage with the appropriate gate signalsdesign. Finally, a prototype multilevel inverter with input DC voltage is applied and output 3-phase voltage440V is implemented.

Final Deliverable of the Project

HW/SW integrated system

Core Industry

Energy

Other Industries

Manufacturing

Core Technology

Clean Tech

Other Technologies

Others

Sustainable Development Goals

Affordable and Clean Energy

Required Resources

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