Abstract:
Current power system interest is intensely going
towards the renewable energy integration to the system in the
form of microgrids. Since microgrid has two major operating
modes as stand-alone and grid-connected, cause a major issue
in protection during the transition of the two operating modes.
When the operating mode changes from the grid-connected
mode to stand-alone mode, fault current magnitude is reduced
drastically. The conventional overcurrent protection
experience several issues including selectivity and sensitivity
during this transition. Also the fact that rotating machines
providing more fault current than that of a power electronic
based equipment is another issue in modern microgrids. As a
solution for these problems adaptive protection can be used to
adapt to the two situations and change its settings according to
the fault current magnitudes. This paper demonstrates an
adaptive protection structure for Inverter Interfaced
Distributed Generator (IIDG) microgrids. This structure is
developed with a central control system that can detect the
operation mode of microgrid. MATLAB Simulink is used to
simulate the relay structure and the test system. The hardware
implementation is currently being developed and not
considered in this paper. The result shows that the relay
structure adapts to the situation by sensing the operation mode
efficiently.
Citation:
Amaratunge, M., Edirisuriya, D.U.Y., Ambegoda, A.L.A.P.L., Costa, M.A.C., Peiris, W.L.T., & Hemapala, K.T.M.U. (2018). Development of adaptive overcurrent relaying scheme for IIDG microgrids. In R. Samarasinghe & S. Abeygunawardana (Eds.), Proceedings of 2nd International Conference on Electrical Engineering 2018 (pp. 71-75). Institute of Electrical and Electronics Engineers, Inc. https://ieeexplore.ieee.org/xpl/conhome/8528200/proceeding