This document discusses a multilevel inverter project. A multilevel inverter provides alternating voltage output using multiple lower level DC voltages as input. The project aims to generate sinusoidal AC voltage up to the multilevel by comparing a 2-level inverter to the multilevel inverter. Multilevel inverters produce outputs that are closer to pure sinusoidal waves and are important for applications requiring higher power and voltage levels like industrial motor drives and power grids.

1. MULTI-LEVEL INVERTER
A multilevel inverter is a power electronic device which is
capable of providing desired alternating voltage level at the
output using multiple lower level DC voltages as an input.

2. GROUP MEMBERS
 HAMZA SAEED KHAN SP14-EPE-096-6A
 MUJTABA HUSSAIN SP14-EPE-092-6A
 WALI-SHAH AFRIDI SP14-EPE-110-6A
 WASIF ALI SP14-EPE-013-6A
 AMIR SHAHZAD SP14-EPE-003-6A

3. DC TO AC INVERTER
BLOCK DIAGRAM
Power
supplies
DC Power AC Power

4. WHAT IS INVERTER
 Direct current/voltage (DC) converted to alternating
current/voltage (AC).

5. ABSTRACTS
 This project generates AC sinusoids up to multilevel.
 It compares existing 2-level inverter with that of our multilevel
inverter.
 ( VSI means Voltage level Inverter )
 We study their effects on voltages
 Existing topologies are same but we get good output from DC i/p

6. WHY THIS PROJECT?

7. GOAL…
 To get sinusoidal voltage
 Up to some extent for appliances.
 Because smoothness for every system is very important
 Abrupt change dose not accepted by inductors and capacitors
 So Square wave is not required for us only sinusoidal smooth wave.

8. WHAT IS MULTI LEVEL
INVERTER

9. MULTI LEVEL INVERTERS
 Preferred to conventional inverters we have
 Capable of producing stepped stair case form as shown next slide;
 Gives us wave nearer to pure sinusoidal wave we require for our
appliances
 We achieve such a desired output as shown after calculations.
 fast switching of DC signal giving us multiple levels.

10. WHY MULTI LEVEL
INVERTERS?
 Because ,In every industry and also in domestic applications,
 Its output is good nearer to sinusoidal voltage as given example;

11. STRUCTURE OF OUR WORK

12. IMPORTANCE OF MLI.
 Used in every field.
 It gives us higher power
 Operated through multiple switches
 Power conditioning
 Industrial Motor Drives
 Power Grids
 Transportation

13. DRAWBACKS
 Having complex structures
 Stresses along the switches.
 Utilizes along the switches
 Utilizes more input sources

14. DEMO OF INVERTERS

15. ANY QUESTIONS PLEASE?

16. SOURCES
 Source: http://engineering.electrical-
equipment.org/electricaldistribution/introduction-to-multilevel-inverter.html
 https://www.youtube.com/watch?v=jCNDRb8dda4
 https://www.google.com.pk/search?q=what+is+Voltage+inverter&biw=1024
&bih=648&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjEzrz7o5XRAhWBb
hoKHXFPDCMQ_AUIBigB#tbm=isch&q=dc+to+ac+inverter+block+diagram
 https://www.google.com.pk/search?q=importance+multilevel+inverter&biw=
1024&bih=599&source=lnms&sa=X&ved=0ahUKEwjyj9KKn5bRAhWGPxoK
Hav_A5MQ_AUIBSgA&dpr=1#q=importance+of+multilevel+inverter+pdf