A single phase cascaded multilevel inverter based on a new basic unit with reduced number of power switches To Get this projects Call : 9566355386 / 99625 88976 Visit : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com

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A Single-Phase Cascaded Multilevel Inverter
Based on a New Basic Unit with Reduced
Number of Power Switches
Abstract
The demand for high-voltage high-power inverters is
increasing, and it is impossible to connect a power
semiconductor switch to a high-voltage network directly.
Therefore, multilevel inverters had been introduced and are
being developed now. With an increasing number of dc voltage
sources in the input side, a sinusoidal like waveform can be
generated at the output. As a result, the total harmonic distortion
(THD) decreases, and the output waveform quality increases,
which are the two main advantages of multilevel inverters. In
addition, lower switching losses, lower voltage stress of dv/dt on
switches, and better electromagnetic interference are the other
most important advantages of multilevel inverters. These kinds
of inverters are generally divided into three main categories, i.e.,
neutral-point-clamped multilevel inverters, flying capacitor
multilevel inverters, and cascaded multilevel inverters. There is
no diode clamped or flying capacitors in cascaded multilevel
inverters. Moreover, these inverters consist of modularity,
simplicity of control, and reliability, and they require the lowest

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LeMeniz Infotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
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number of power semiconductor devices to generate a particular
level.
Existing system
A cascaded H-bridges multilevel inverter is simply a series
connection of multiple Hbridge inverters. Each H-bridge
inverter has the same configuration as a typical single-phase
full-bridge inverter. The cascaded H-bridges multilevel inverter
introduces the idea of using Separate DC Sources (SDCSs) to
produce an AC voltage waveform. Each H-bridge inverter is
connected to its own DC source Vdc. By cascading the AC
outputs of each H-bridge inverter, an AC voltage waveform is
produced. By closing the appropriate switches, each H-bridge
inverter can produce three different voltages: +Vdc, 0 and -Vdc.
It is also possible to modularize circuit layout and packaging
because each level has the same structure, and there are no extra
clamping diodes or voltage balancing capacitors.
Proposed system
In order to increase the number of generated output levels
by using a lower number of power electronic devices, a new
basic unit is proposed in this paper. By a series connection of
several proposed basic units, a new cascaded multilevel inverter
is proposed. Then, to generate all positive and negative levels at

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LeMeniz Infotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
Web : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
the output, an H-bridge will be added to this inverter because the
proposed inverter only generates positive levels. This inverter is
called the developed proposed cascaded multilevel inverter. In
order to generate all voltage levels at the output, four different
algorithms are proposed.
Advantages
 Requires the minimum number of power switches, IGBTs,
power diodes, driver circuits, and dc voltage sources.
 Reduction in the installation space and total cost of the
inverter

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LeMeniz Infotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
Web : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
Block diagram
LOADFULL BRIDGE
INVERTER
INPUT DC
SUPPLY
UNIT1
5V DC
12V DC OPTO ISOLATOR
CIRCUIT
PIC CONTROLLER WITH
BUFFER
UNI DIRECTIONAL
SWITCHING
CIRCUIT UNIT 1
INPUT DC
SUPPLY
UNIT2
UNI DIRECTIONAL
SWITCHING
CIRCUIT UNIT 2
INPUT DC
SUPPLY
UNIT3
UNI DIRECTIONAL
SWITCHING
CIRCUIT UNIT 3
DRIVER
CIRCUIT
12V DC

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Copyright © 2015 LeMeniz Infotech. All rights reserved
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LeMeniz Infotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
Web : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
Tools and software
 MPLAB – microcontroller programming.
 ORCAD – circuit layout.
 MATLAB/Simulink – Simulation.