Abstract:
With the increasing demand of energy in a far-reaching complex network, integration
of DER’s is getting popularity due to limited available energy resources in meeting
the demands of consumers. Introduction of DG’s leads to challenges in the
formulation of protection scheme for micro-grids which includes varying fault
current levels during transformation from grid connected mode to islanded mode. To
encounter this issue a new protection mechanism is formulated based on Magneto
restive (MR) sensor and super imposed reactive energy (SRE) for short circuit faults
in microgrids. A highly sensitive MR sensor are employed to obtain the magnetic
field at both ends of the distribution lines. The magnetic field is used to calculate the
total harmonic distortion to detect the faults in the microgrids. After detection of
faults, the proposed scheme uses SRE to identify the faulty zone in the microgrids.
Next, superimposed components of current are extracted for fault classification. To
validate the accuracy of the presented protection scheme massive simulations have
been performed using MATLAB/Simulink. Results showed that proposed scheme
can effectively detect, classify and isolate different faults in grid connected and
islanded mode with varying fault location and resistances for radial as well as looped
configuration of micro-grid.
