Power control in ac isolated microgrids with renewable energy sources and energy storage systems To Get this projects Call : 9566355386 / 99625 88976 Visit : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com

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Power Control in AC Isolated Microgrids
with Renewable Energy Sources and Energy
Storage Systems
Abstract
Introduction:
The supply of electricity to these communities in several
developing countries, in general, is still done in a precarious way
using diesel generator that operates for 3–4 h a day. This has
happened mostly due to the high cost associated with the
expansion of the conventional power grid to these communities.
In some cases, technical and environmental constraints also have
been factors that have prevented the full electrical service in
these communities, particularly those located on oceanic islands.
Another application of isolated microgrids occurs when a
microgrid is disconnected from the main grid for any reason, in
general to improve the local energy reliability. Due to the
intermittent nature of renewable energy sources (RESs), the
uninterrupted availability of the generation system, and its
stand-alone operation, it is required some kind of energy storage
system (ESS) in these applications. Although there are several
different ESSs, in practical applications, battery banks have been
used mainly due to economic reasons. In general, a backup

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Copyright © 2015 LeMeniz Infotech. All rights reserved
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
energy source must be used during the lack of the primary
renewable energy sources, when the ESS is discharged or when
the generation system is under maintenance.
Existing system:
A crucial issue related to these autonomous and distributed
microgrids is to control the power generated internally to
maintain the system energy balance in order to keep the terminal
voltage of the battery bank limited to a safe value and
consequently maintain its state of charge (SOC) under control.
One possible solution is to use centralized or distributed
resistive dump loads to burn the eventual excess of generated
power, is presented. Another possibility is to use physical
communication (wiring) between the converters to inform their
control systems about the balance of energy in the microgrid and
the amount of power that each of them must generate to keep
this energy balance under control.
Proposed system:
This paper proposes an alternative strategy to control the
generated power within an isolated ac microgrid with distributed
RES. The proposal is to control the terminal voltage of the

3. Do Your Projects With Domain Experts…
Copyright © 2015 LeMeniz Infotech. All rights reserved
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 battery banks below or equal its maximum allowable
value. This is done by limiting the amount of power that each
energy source can generate at each instant. The microgrid
frequency is used to characterize the state of charge of the
battery bank and quantify to the converters’ control systems how
much power they need or can generate to maintain under control
the internal power balance of the microgrid. The control of the
battery banks’ terminal voltage implies indirectly the control of
their SOC.

4. Do Your Projects With Domain Experts…
Copyright © 2015 LeMeniz Infotech. All rights reserved
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:
 Grid connected applications
Block diagram:
INPUT DC
SUPPLY
DC TO DC
CONVERTER
THREE
PHASE
INVERTER
LOAD
WIND AC
SUPPLY
TURBINE
SIDE
INVERTER
DC LINK GRID SIDE
INVERTER
GATE DRIVER
PIC CONTROLLER WITH BUFFER
12 V DC
5 V DC

5. Do Your Projects With Domain Experts…
Copyright © 2015 LeMeniz Infotech. All rights reserved
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.