An Enhanced Single-Phase Step-Up Five-Level Inverter In this letter, an enhanced step-up five-level inverter is proposed for photovoltaic systems. Compared with conventional five-level inverters, the proposed topology can realize the multilevel inversion with high step-up output voltage, simple structure, and reduced number of power switches. The operating principle of the proposed inverter has been analyzed and the output voltage expression has been derived. In addition, the comparison with existing topologies of single-phase five-level inverters is presented. Finally, experimental results validate the performance of the proposed topology. Web : http://www.lemenizinfotech.com web : http://www.lemenizinfotech.com/tag/ieee-projects-in-pondicherry/ Web : http://ieeemaster.com Web : http://ieeemaster.com/power-electronics-ieee-projects-2016-2017/ Web : http://ieeemaster.com/power-system-ieee-projects-2016-2017/ Address: 36, 100 Feet Road(Near Indira Gandhi Statue), Natesan Nagar, Pondicherry-605 005 Contact numbers: +91 95663 55386, 99625 88976 (0413) 420 5444 Mail : projects@lemenizinfotech.com Mobile : 9566355386 / 9962588976

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LeMenizInfotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
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An Enhanced Single Phase Step-Up Five
Level Inverter
Introduction:
In the past decade, renewable energy sources such as
photovoltaic (PV)-based systems have attracted much more attention
due to the advantages such as less environmental impact and
improved economic benefits. With the rapid growth of power
electronics technology, various converters topologies have been
developed for PV systems. Among these topologies, multilevel
inverters have been receiving significant interest due to the reduced
total harmonic distortion (THD) and improved quality of output
waveform. As the output voltage level increases, the output harmonic
content of such inverters decreases, allowing the use of smaller output
filters.
Existing system:
A single -phase five-level inverter using coupled inductors and
the common three-arm power module, in which only one dc voltage
source is needed and split of the dc voltage capacitor is also avoided,
which eliminates the problem of dc capacitor voltage balancing with
the conventional topologies. Meanwhile, six power switches with the
same voltage stress and only one set of coupled inductors are adopted.
Also, less inductor is needed in the inverter explained. With these
modulation methods, no dc component exists in the inductor currents
under all load conditions, which will benefit the full use of the
magnetic cores and minimization of the inductors.

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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
Drawbacks:
 Coupled inductors need to be carefully designed.
 High total harmonic distortion (THD).
 Low power quality of output waveform.
Proposed system:
The proposed single phase step-up five-level inverter consists of
a single dc source, a conventional boost converter, a switch-diode-
capacitor cell and an H-bridge. The diode-capacitor cell (C1-D1, C2-
D2) and the inductor L1 are used to boost the dc-link voltage. The
multilevel signal is generated by switch S2 and the diode capacitor
cell. The proposed topology can implement the multilevel inversion
with high step-up output voltage.

3. The Master of IEEE Projects
Copyright © 2016LeMenizInfotech. All rights reserved
LeMenizInfotech
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
Advantages:
 Reduced number of power switches, diodes and a single dc
source are used.
 Multilevel inversion with step-up output voltage is obtained.
 Only four switches work at high frequency whilst two switches
work at low frequency (50 Hz), which helps to reduce the
switching losses.
 Simple topology and easy control is achieved.
Applications:
 Uninterrupted power supply.
 AC module applications.

4. The Master of IEEE Projects
Copyright © 2016LeMenizInfotech. All rights reserved
LeMenizInfotech
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:
PV solar
supply
Boost circuit Switch diode
capacitor cell
H Bridge
Inverter
Load
Isolation circuit Driver circuit12V DC
5V DC
Buffer Circuit
Micro Controller
Circuit