Generation rescheduling of most sensitive zone for congestion management

Abstract

In competitive electricity markets, one of the important tasks of the system operator is to manage congestion of transmission lines as it leads to a violation of network security limits. This paper presents an effective approach for system operator to identify the most sensitive zone to relieve congestion in transmission lines. In this approach sensitivity factors are utilized to perform the task of defining the system into no. of zones. Once the zones are formed then the task of SO becomes much easier as they have to concentrate on most sensitive zone rather on the entire system. Also concept of desired generation scheduling is proposed for rescheduling generation in order to relieve congestion. By this method the contribution of generators to the congested line is to be found out which are thereafter utilized for rescheduling purpose of relieving congestion. Here our task is managing congestion of most sensitive zone with the help of rescheduling of generators in that particular zone only. Thus we are trying to make the system congestion free without disturbing the generators of the other zones of the system that is only by means of the generators of its own zone. Results obtained for network overload alleviation of IEEE 30 Bus System & IEEE 39 Bus New England System are presented for illustration purposes. Here in this approach only real power flow violations of lines has been considered.