Design of Reduced Device Count Multilevel Inverter by using Multicarrier PWM technique

In last few years multilevel inverters have brought the revolution to the industry and research. The multilevel inverters provide the number of levels in the output, which results in smoother waveform that contains less number of harmonics as compared to the traditional inverters. While cl

Project Title

Design of Reduced Device Count Multilevel Inverter by using Multicarrier PWM technique

Project Area of Specialization

Electrical/Electronic Engineering

Project Summary

In last few years multilevel inverters have brought the revolution to the industry and research. The multilevel inverters provide the number of levels in the output, which results in smoother waveform that contains less number of harmonics as compared to the traditional inverters. While classical topologies of multilevel inverters have proved to be viable alternative in a wide range of high power medium voltage level applications.  As the name suggests multi levels of the output voltage are obtained and as the number of levels increases the waveform becomes smoother but on the same time use of semiconductor devices and other equipment increases.

The use of semiconductor devices make the inverter efficient but the vast utilization of high power medium voltage rated switches require protection scheme, gate driver portion and heat sink, thus the overall system becomes complex and voluminous. Thus a multilevel inverter with reduced number of devices is seeking the attention of researchers as it offers immense advantages over other classical topologies  In this project a reduced device count multilevel inverter will be designed. The design of the inverter will use the control  through  multi carrier pulse width modulation (PWM)  techniques. These PWM techniques offer the advantage of utilization of less number of switches for the effective and distortion free conversion of DC to AC.

Project Objectives

The reduced device count multilevel inverter by using multicarrier pulse width modulation techniques will be designed within the given timeline and the key objectives for this design are:

• To design a reduced device count multilevel inverter by using multicarrier PWM techniques.
• To decrease the complexity of the inverter circuit.
• To provide the consumer a device that will be capable of delivering significant levels of output voltage by utilizing least number of devices, power sources and other equipments.
• To reduce the harmonic contents in the output waveform
• To bring an inverter that uses  pulse width modulation strategies for the purpose of controlling switching signals.
• To bring an economical inverter, that will also be superior in its performance as compared to the conventional available devices in the market.

Project Implementation Method

• Step # 1: First of all the advanced topologies of multilevel inverters will be reviewed  in detail.
• Step # 2: Before moving towards the hardware the simulation work will be done with the help of MATLAB Simulink software.
• Step # 3: The proposed prototype for reduced device count multilevel inverter by using multicarrier PWM techniques, will be designed and the performance will be analyzed.
• Step # 4: After completion of hardware design, for industrial use the voltage level will be transformed as per the rating of inductions motors, and the AC loads, the specific industry is using, whereas for domestic usage,  the output voltage level will be transformed  to 220V so as to match it with the national grid standard.
• Step # 5: Finally after successful analysis, the designed project will be implemented in houses as well as in industries.

Benefits of the Project

Nowadays, the concentration of power generation is moving towards the pollution free and environment friendly sources. The major renewable sources solar, fuel cell and offshore wind turbines are producing dc power, but the national grid supplies AC power, and the loads which we normally use are alternating, therefore the DC power produced must be effectively converted  into AC economically. The designed multilevel inverter has superiority over other conventional inverters, as well as over the current present multilevel inverters, as it provides the output near to the sinusoidal waveform, thus the transformer can also be utilized safely to step up or down the voltage level as the voltage waveform is nearer to sine wave. The harmonics issues will also be very less as compared, to the conventional inverters. The designed project can be widely utilized in industries, as the majority of industries use induction motors, which must be fed continuously from the AC voltage source, and the designed project will prove to be, much economical so that it can also be used for domestic loads, at homes.

Technical Details of Final Deliverable

• The final design will consist of a low power control circuit and high power main circuit, where the semiconductor devices will be assembled along with the controller,  in such a manner, so that the design will be simpler and will contain less number of semiconductor switching devices and other equpiments.
• The final design of the project will lead to the effective DC to AC conversion.
• It will solve the major problem faced by multilevel inverters i.e. the complexity of the inverter design will be reduced.
• The total harmonic content will also be reduced as compared to the conventional available inverters.
• The pulses for the switching of semiconductor devices will be generated with the help of multicarrier PWM techniques, which will provide effective control on the switching.

Final Deliverable of the Project

HW/SW integrated system

Core Industry

Energy

Other Industries

Others

Core Technology

Clean Tech

Other Technologies

Others

Sustainable Development Goals

Affordable and Clean Energy

Required Resources

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