Good for seminar

1. SEMINAR
ON
Design of a New Five Level MLM based Multilevel Inverter
PRESENTED BY
NANDINI WADDI
UNDER THE GUIDANCE
OF
Prof. ASHISH BIRADAR

2. CONTENTS
 Abstract
 Introduction
 Multi Level Module Based MLI
 Block Diagram
 Switching Table For Five Level MLI
 Operational Explanation
 Applications
 Advantages
 Reference

3. ABSTRACT
• A novel cascaded multi-level inverter(MLI) with a multi-level module
(MLM) is introduced.
• The inverter consists of sub multilevel units and a full bridge circuit.
• By increasing the number of output voltage levels the power quality can
be improved.
• The harmonic content in the output voltage of the MLI can be minimized
by applying a PWM optimization strategy.
• Multi carrier phase disposition (PD) PWM with constant frequency
method is used to trigger the gate pulses.
• The operation and performance of the multi-level module based on 5
level MLI has been simulated in PSIM.

4. INTRODUCTION
• Multi level inverters have created wide interest in the
industry as well as in the research area.
• They play a significant role in high voltage dc power
transmission, active filters, hybrid electric vehicles and
renewable energy applications
• MLI is a power electronics interface which produce a
staircase waveform at the output by connecting
semiconductor switches like IGBTs, MOSFETs etc.

5. • The three basic conventional single-phase multilevel inverter are
1.Dc multilevel inverter (DCMLI)
2.Flying capacitor multilevel inverter(FCMLI)
3.Cascaded H-Bridge multilevel inverter(CHBMLI).
• To increase the levels of output voltage waveformextra
bidirectional switches and extra H-bridge circuits needed in the
structure.

6. MULTI LEVEL MODULE BASED MLI
• A multilevel module (MLM) generates a voltage waveform
with a staircase manner at the output.
• Multilevel Module is combination of n number of voltage
sources and n number of bi-directional switches.
• It alternates the polarity of inputvoltage and produce staircase
output.

7. BLOCK DIAGRAM

8. SWITCHING TABLE FOR FIVE LEVEL MLI

9. OPERATIONAL EXPLANATION
This mode produce output voltage of +2Vs when the switch
S2 is turned ON from level generation unit and the switches
Q1 and Q4 are ON from polarity generation part . Then the
switches left in the circuit are OFF state.
MODE 1:+2Vs

10. This mode creates the magnitude of +Vs of output voltage when
the switch S1 is turned ON from level generation part and
switches Q1 and Q4 are ON from polarity generation part. Then
the remaining switches are in OFF state.
MODE 2:+Vs

11. MODE 3 MODE 4: -Vs MODE 4: -Vs
In this mode the output voltage of zero magnitude
is produced by the switches Q3 and Q4 conducts from the
polarity-generation part and the remaining switches are
OFF.
MODE 3:0Vs

12. This mode creates the magnitude of −Vs of output voltage in the same manner of
positive modes of operation . However the Switches Q2 and Q3 are operated from
polarity generation part instead of Q1 and Q4 and from level generation part,
switch S1 conducts same as in Mode 2 operation of the circuit. Then the remaining
switches are in OFF state.
MODE 4: -Vs

13. MODE 5: -2Vs
It generates the output voltage of −2Vs when the switch S2 is
conducts from level generation part and switches Q2 and Q3 are
turned ON from polarity generation part. Then the remaining
switches are in OFF state.

14. APPLICATIONS
• Renewable Energy Systems: The solar photovoltaic and wind
turbine systems for converting DC power generated by
renewable sources into AC power.
• Electric Vehicles (EVs): Power conversion in electric vehicles
for efficient energy transfer between the battery pack and the
traction motor.
• Industral Motor Drives:Controlling the speed and torque of
electric motors in industrial machinery and improving the
efficiency.

15. ADVANTAGES
• Higher Efficiency:Compared to traditional inverters which
reduces the losses and improves the efficiency.
• Improved Power Quality:By providing smoother voltage
waveforms and voltage regulation than the multilevel
inverters improves the power quality
• Compact Design:The MLI can achieve higher power density
to traditional inverters to optimizing the space utilizations in
various applications.

16. REFERENCES
• B. Mahato, S. Mittal and P. k. Nayak, ”N-Level Cascade
MultilevelConverter with optimum number of switches,” 2018
International Con_x0002_ference on Recent Trends in Electrical,
Control and Communication(RTECC), Malaysia, Malaysia,
2018.
• J.S. Lai and F.Z. Peng, Multilevel Converters - A new breed of
powerconverters, Conference Record of the IEEE-IAS Annual
Meeting,1995.

17. • A. Nabae, I. Takahashi, and H. Akagi, A new neutral-
pointclamped PWM inverter, IEEE Trans. Ind. Applicat, vol. IA-
17, pp.518523,Sept./Oct. 1981.
• Rahim, N.A.; Chaniago, K.; Selvaraj, J.; ”Single-Phase Seven-
LevelGrid-Connected Inverter for Photovoltaic System”, IEEE
Transactionson Industrial Electronics, Volume.58, Issue.6,
pp.2435-2444, 2011.

18. THANK YOU