Autonomous control of microgrids

TLDR

Distributed generators can both solve and cause problems, operating in parallel with the grid or in island mode to provide UPS services. The study proposes a system approach that treats generation and loads as a microgrid to better realize distributed generation potential. The microgrid autonomously disconnects from the utility during faults or voltage collapses and can also intentionally disconnect when grid power quality falls below standards, with laboratory verification of CERTS control concepts. Using waste heat from the sources increases overall efficiency and improves the project's financial attractiveness.

Abstract

Application of individual distributed generators can cause as many problems as it may solve. A better way to realize the emerging potential of distributed generation is to take a system approach which views generation and associated loads as a subsystem or a "microgrid". The sources can operate hi parallel to the grid or can operate in island, providing UPS services. The system will disconnect from the utility during large events (i.e. faults, voltage collapses), but may also intentionally disconnect when the quality of power from the grid falls below certain standards. Utilization of waste heat from the sources will increase total efficiency, making the project more financially attractive. Laboratory verification of the Consortium for Electric Reliability Technology Solutions (CERTS) microgrid control concepts are included