A Self-Organizing Nano Grid (SONG) for Energy Access Clusters

Kartavya Agarwal, Vikram Chowdhury, Joseph Benzaquen, Prasad Kandula, Deepak Divan

Research output: Contribution to conferencePaper

2 Scopus Citations


In this paper, a bottom-up dc Self-Organizing Nano Grid (SONG) for rural electrification at ultra-low-cost through a flexible and scalable topology is presented. The proposed nano grid requires no communication and uses dc-bus signaling to convey excess energy in the system through the bus voltage, allowing independent agents to conduct energy transactions based on their needs in a decentralized manner. Moreover, this article proposes a concept that uses a novel multi-source, multi-segment droop control strategy with demand coordination, allowing for dynamic self-balancing of the system under fluctuating operating conditions. The unique use of a surplus photovoltaic (PV) power droop mode precisely estimates energy availability to minimize load chattering that helps in stabilizing the dc-bus. In addition, this architecture uses standard dc/dc converters for a low-cost, modular, Plug and Play ( PnP ) solution with highly automated operation, enabling local assembly, operation, and maintenance by non-technical personnel. The proposed SONG concept was validated in simulation and with a 700W, laboratory-scale, custom made nano grid system. The simulation and experimental test cases show the feasibility of the SONG system by demonstrating the proposed multi-source, multi-segment droop control strategy without load chattering under varying operating conditions.
Original languageAmerican English
Number of pages6
StatePublished - 2022
Event2022 IEEE Energy Conversion Congress and Exposition (ECCE) - Detroit, Michigan
Duration: 9 Oct 202213 Oct 2022


Conference2022 IEEE Energy Conversion Congress and Exposition (ECCE)
CityDetroit, Michigan

NREL Publication Number

  • NREL/CP-5D00-85104


  • dc-dc converter
  • decentralized control
  • distributed energy resources
  • droop control
  • energy access
  • nano grid


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