Abstract
ABSTRACT The relay co-ordination is the nerve centre of the microgrid system, as the same is responsible for the reliability of operation and enhanced efficacy. This research work focuses on an ‘adaptive centralised protection’ for radial microgrid. The insertion of Distributed Generators (DG) in the distribution system changes the short circuit level dynamically (based on the type of Distributed Generator, number of DG, capacity of Distributed Generator, etc.,) and also makes radial unidirectional power flow to bidirectional. The relay settings have to be revised, accommodating these dynamic changes. Hence, a centralised adaptive protection technique, which revise the relay settings dynamically and an adaptive relay co-ordination technique, based on dynamic relay numbering is suggested and implemented, to carry out better protection in the system. The high reliability of the microgrid is ensured, through a Microgrid Central Controller Reconfiguration Algorithm. The proposed algorithm is verified, using an IEEE 33 bus distribution microgrid.
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