A single stage ccm zeta microinverter for solar photovoltaic ac module To Get this projects Call : 9566355386 / 99625 88976 Visit : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com

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Web : www.lemenizinfotech.com / www.ieeemaster.com
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A Single Stage CCM Zeta Micro inverter for
Solar Photovoltaic AC Module
Abstract
Introduction:
Among various microinverters reported in literature, the
most generic are two stage inverters where a dc/dc converter is
used in the front-end to track MPPT and to boost the voltage
while second stage pulse width modulated (PWM) inverter
convert dc to ac. The major drawback of this type of inverters is
the components count and cost. Non-isolated microinverters are
simple and compact, but boosting the voltage to the grid level
without transformer is a major concern. Third kind is single-
stage microinverters where all three tasks i.e. MPPT, voltage
boosting and dc to ac conversion are done in one stage. Such
microinverters are very promising due to reduced switch count
and high power density. Other type of microinverters utilize
active power decoupling that enables the use of thin film
capacitors instead of electrolytic capacitors to increase the life
span of the microinverter. However, this comes with an
additional cost and relatively low efficiency.

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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 flyback converter is used in both AC/DC and DC/DC
conversion with galvanic isolation between the input and many
outputs. The flyback converter is a buck-boost converter with
the inductor split to form a transformer, so that the voltage ratios
are multiplied with an additional advantage of isolation. The
flyback converter is an isolated power converter. The two
prevailing control schemes are voltage mode control and current
mode control (in the majority of cases current mode control
needs to be dominant for stability during operation). Both
require a signal related to the output voltage. There are three
common ways to generate this voltage. The first is to use
an optocoupler on the secondary circuitry to send a signal to the
controller. The second is to wind a separate winding on the coil
and rely on the cross regulation of the design. The third consists
on sampling the voltage amplitude on the primary side, during
the discharge, referenced to the standing primary DC voltage.
Proposed system:
Operation of zeta microinverter is explained for the positive
half cycle of load current at switching frequency. The main
switch Sm is modulated at high frequency (HF) with a variable

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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
duty cycle to generate rectified ac output and secondary
switches S1 - S4 are operated at line frequency to produce ac
output at line frequency. On the secondary side, during positive
half cycle of load current switches S1, S3 are gated to conduct
and during negative half cycle of load current, switches S2, S4
are gated to conduct. Steady-state operation of the proposed
microinverter in DCM and CCM mode of operation is analyzed.
Advantages:
 Reduced conduction losses, switch ratings and current
stress.

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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
Applications:
 PV applications.
Block diagram:
INPUT
DC supply
Isolated Zeta
converter
Single Phase
Inverter
Load
OPTO coupler
circuit
12 V
DC
12 V
DC
Gate driver
circuit
5VDC
BUFFER circuit
PIC controller
circuit

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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.