Directional over Current Coordination Techniques for Cascaded network Using Matlab - Linknet Structure

Abstract

In interconnected power system stability of entire system is concern of the principal importance for
coordination. So many techniques are developed in field of relay coordination in a power system. With
interconnection a large number of protective relays are required depend on protection system. These relays are needed
to be coordinated to give their optimal load flow and protection level. This work out regarding load flow analysis, fault
level computations along with listing the primary & back up pair is going to be really monotonous. This work out can
be quite difficult simply because we have to make collection of contingencies along with relay setting , which are to be
decide using the worst circumstance. This paper represents different methodologies used to treat the problem of
optimization of relay coordination of direction relay in cascaded interconnected power system. Attempts have been
produced to cover all the methods used for over current relay coordination. Conventional techniques and new
approaches like Genetic algorithm (GA) and Artificial intelligence (AI) are described briefly. Also MATLAB software
based approach is explained by a case study and the results are also provided, so that the reader can easily understand
DCOR relay coordination.