WIDE AREA MONITORING AND PROTECTION

Abstract

Smart grid technology requires intelligent and e cient monitoring of power system net- work in control centers to prevent unwanted power system blackouts. With recent tech- nological developments, it is now feasible to monitor the health of power system in real time by using wide-area measurement system (WAMS) having phasor measurement units (PMUs). PMUs are considered as an integral and important component in the smart grid era. PMU devices have the ability to provide data measurement at a very fast rate and it can also accurately time synchronize the phasor measurements of the system to a common time reference using GPS signal. This work utilizes PMU data for wide- area backup protection(WABP). Di erent features using positive and negative-sequence components have been studied and integrated using fuzzy logic to distinguish faults from other power system disturbances more accurately and reliably. The performance of this new protection scheme is evaluated for di erent types of faults on a modi ed 400 kV WSCC-9 bus network simulated through EMTDC/PSCAD software. Programming for implementation of proposed algorithm is done in MATLAB environment. Crucial issues such as current inversion, voltage inversion and load encroachment are also addressed. It is di cult to identify fault inception during power swing condition. Conventional fault detection methods for normal operation of power system nds limitation during power swing condition. A faulted section identi cation technique during power swing using WAMS has also been presented in this work.