A Self-Organizing Nano Grid (SONG) for Energy Access Clusters
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.
- Research Organization:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE National Renewable Energy Laboratory (NREL); Georgia Institute of Technology, Center for Distributed Energy
- DOE Contract Number:
- AC36-08GO28308
- OSTI ID:
- 1916441
- Report Number(s):
- NREL/CP-5D00-85104; MainId:85877; UUID:71ef7f62-45b2-4a46-a332-c23e85a587e7; MainAdminID:68528
- Resource Relation:
- Conference: Presented at the 2022 IEEE Energy Conversion Congress and Exposition (ECCE), 9-13 October 2022, Detroit, Michigan
- Country of Publication:
- United States
- Language:
- English
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