, 44:217 | Cite as

Impact of microgrid operation on performance of radial distribution system



Voltage profile and real power loss are the criteria in determining performance of Radial Distribution System (RDS). Presence of Distributed Generators in RDS is assessed by ‘Penetration Ratio’. The use of PR fails in the analysis of the implications of the presence of a Microgrid on RDS as it is zero in islanded mode and sometimes in grid-connected mode. An attempt has been made to introduce a new term ‘Relief Factor’ to overcome this lacuna. This Factor is evaluated by developing an algorithm based on power flow analysis using Backward Forward Sweep method. The developed algorithm is tested on a 34 bus RDS by integration of a two-shift industrial Microgrid. The power flow analysis is run for 24 snapshots of the day. Relief Factor is found to be suitable to analyze the impact of a Microgrid on the performance of RDS in both the modes of Microgrid operation viz. grid-connected mode and islanded mode.


Radial distribution system microgrid power flow penetration ratio 

List of symbols


line current in ith line


resistance of ith line


total active power supplied to RDS by the utility


total reactive power supplied to RDS by the utility


total active power demand of RDS including Microgrid demand


total reactive power demand of RDS including Microgrid demand

P loss

active power loss in RDS

Q loss

total reactive power loss in RDS


active power generation of Microgrid


reactive power generation of Microgrid


active power demand of Microgrid


reactive power demand of Microgrid

\( {\text{P}}_{{\upmu{\text{G}}}}^{\text{in}} \, \)

active power exported by Microgrid to RDS


number of generators in Microgrid


number of lines in RDS


relief factor


penetration ratio


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Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  1. 1.Department of Electrical EngineeringCollege of EngineeringPuneIndia

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