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GUIDED BY : PRESENTED BY : Prof. Rahul Vyavahare Shrikant

Bhansali

UTILITY CONNECTED MICROGRID BASED DISTRIBUTION GENTRATION SYSTEM FOR

POWER FLOW MANAGEMENT

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CONTENT

Introduction Publications Paper Objectives Block Schematic Advantages Future scope Conclusion References

What is DGs?In distribution levels, many smaller renewable

generators (e.g. photovoltaic, fuel cells, micro hydro etc.) will be connected to the networks. These are called distributed generators (DGs) or distributed energy resources (DERS).

What is microgrid ?A microgrid is a cluster of loads and

microsources operating as a single controllable system that provides power to its local area.

IntroductionThis paper proposes a method for power flow control between utility and microgrid through back-to-back converters, which facilitates desired real and reactive power flow between utility and microgrid.

In mode-1, specified amount of real and reactive power are shared between the utility and the microgrid through the back-to-back converters.

Mode-2 is invoked when the power that can be supplied by the distributed generators (DGs) in the microgrid reaches its maximum limit. In such a case, the rest of the power demand of the microgrid has to be supplied by the utility

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Publication Ritwik Majumder, Student Member, IEEE, Arindam Ghosh, Fellow, IEEE, Gerard Ledwich, Senior Member, IEEE, Firuz Zare, Senior Member, IEEE Date of publication :2 MAY 2010

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Objectives

To improve power sharing techniques in microgrid with converter interfaced sources

To improve power management system and reliability of the microgrid

To achieve superior power sharing in rural network with high R/X lines

To facilitate load frequency control of the microgrid and a smooth transition between grid in connected

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Block Schematic

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Advantages Stability of grid system is achieved to great extent The power quality at consumer premises can be improved Economical based operation One of the major advantages of the back-to-back converter

connection is that it can provide isolation between the utility and the microgrid, both for voltage and frequency fluctuations.

FUTURE SCOPE OF WORK

Protection of back to back converters in case of fault can be investigated

The improvement can be achieved by selection of more appropriate input signals or controller gains

Modified drop control can be derived for frequency dependent load Communication can be used to correct the reference quantities The reliability in a microgrid can be improved with the application of

back-to-back converters for bidirectional power flow

Conclusion Power sharing can be achieved with dropping output voltage angels of the converters

The quality of distributed generation can be improved significantly by proper reference

generation for the DG’S The reliability in a microgrid can be improved with the application of back-to-back

converters A low band width communication can also improve power sharing significantly

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References [1] IEEE Standard for Interconnecting Distributed Resources with Electric

Power Systems," IEEE Std 1547-2003 , vol., no., pp.0_1-16, 2003URL:http://ieeexplore.ieee.org/stamp/stamp.jsp?

arnumber=1225051&isnumber=27496 [2] R. H. Lasseter, "MicroGrids," in Power Engineering Society Winter Meeting, 2002.

IEEE, 2002, pp. 305-308, vol.1. [3] M. Milosevic, P. Rosa, M. Portmann, and G. Andersson, "Generation Control with

Modified Maximum Power Point Tracking in Small Isolated Power Network with Photovoltaic

Source," in Power Engineering Society General Meeting, 2007. IEEE, 2007, pp. 1-8.

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Thank you