TITLE:
Fuzzy Based Algorithm for Stage-I of Cascaded Intelligent Relaying
AUTHORS:
Soumyadeep Samonto, Samarjit Kar, Sagarika Pal, Arif Ahmed Sekh, Bishal Sarkar
KEYWORDS:
Fault, Current Error, Protection, Cascaded, Trip, Fuzzy Logic Controller
JOURNAL NAME:
International Journal of Intelligence Science,
Vol.11 No.1,
January
4,
2021
ABSTRACT: In the
present scenario the
protection system has become an important issue in the field of the power system. An Intelligent protection system has been introduced
in many sectors like low voltage DC breakers, VCB, SF6 and so on. The said protection schemes have been developed to
control the moving contacts using intelligent algorithms for tripping overall
load against phase to ground faults occurring within the system. The related
works have introduced Trapezoidal and Triangular membership functions as input
to the fuzzy inference system. It is also found that the Fuzzy Logic Controller
has been designed by taking two inputs as current and voltage. The output
membership function has been preferred by implementing Trapezoidal and Gaussian
membership functions. In this paper, a new concept based over current protection scheme has been introduced. Intelligent relaying technique has been used to trip a particular load against over current
fault by introducing multistage cascaded intelligent relaying. Initially, the proposed method is carried out for
Stage-I and reported by incorporating fuzzy algorithm by taking current error
and current error rates as input using Gaussian membership function to the
black box and fed signal to the breaker as output using trapezoidal and
triangular membership function respectively to control the loads connected in
the system. The best-fit membership function as input to the fuzzy engine is
shown here is Gaussian membership
function. The analysis reported here by taking both the fault scenario as phase to phase and phase to ground respectively.