Grid connected forward microinverter with primary-parallel secondary-series transformer To Get this projects Call : 9566355386 / 99625 88976 Visit : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com

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36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
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Call: 0413-4205444, +91 9566355386, 99625 88976.
Web : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
Grid-Connected Forward Microinverter with
Primary-Parallel Secondary-Series
Transformer
Abstract
Traditionally, central inverter technology is used to
overcome the low voltage generated by photovoltaic (PV)
arrays. However, in residential applications, the energy yield is
jeopardized due to mismatches and partial-shading. Distributed
maximum power point tracking (DMPPT) architectures, in both
dc–dc and dc–ac systems, improve the energy harvesting
capability by means of a module-integrated converter. Despite
nonisolated solutions have been presented for dc–dc optimizers
and ac-module applications, the use of a transformer is
widespread providing flexibility, an adequate voltage boost and
compliance with safety standards. Current-fed-isolated
converters are widely used in DMPPT architectures due to their
inherent boosting capabilities. Single-stage flyback inverter is a
commonly used topology in ac-module applications due to its
simple structure. Buck derived topologies are mainly used as
step-up dc–dc converters in two-stage inverters.

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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
Existing system
The topology structure is constituted of high frequency
pulse DC link circuit and DC/AC inverter. The high frequency
pulse DC link circuit has the functions such as high frequency
electrical isolation, power conversion, producing high frequency
pulse DC voltage, and absorbing reactive energy from AC side
of DC/AC inverter bridge. The power devices of the DC/AC
inverter turn on/off when the high frequency pulse DC voltage
gets to zero and make zero-voltage switching possible.
Proposed system
In the configuration presented, the necessary primary to
secondary turns ratio to achieve a proper interfacing between the
low PV module voltage and the grid is large, thus the
performance of the converter can be worsened. The proposed
method, which consists of several highly coupled transformers
which are parallel connected in the primary side and series
connected in the secondary side. The parallelization in the
primary side reduces the current stress in both switches and
primary windings of the transformer. The current sharing is
guaranteed because of the secondary series connection, although
affected by the coupling of the individual transformers. The
current stress is also decreased in the secondary side diodes due
to the common cathode configuration and the synchronized

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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
driving of the primary switches. As a result, SMD devices can
be used, a low-profile implementation is feasible and the thermal
management is improved, although more devices are needed.
The secondary series connection allows achieving the grid
voltage using transformers of lower turns ratio.

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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
Advantages
 Leakage inductance can be reduced.
Applications
 Photovoltaic (PV) arrays.
Block diagram
SOLAR
INPUT
FORWARD
CONVERTER
OPTO COUPLER
CIRCUIT
PIC CONTROLLER WITH
BUFFER
5V DC
12V DC
LOADFULL BRIDGE
INVERTER
GATE 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 used:
 MPLAB – microcontroller programming.
 ORCAD – circuit layout.
 MATLAB/Simulink – Simulation.