Improving Zonal Congestion Relief Management using economical & technical factors of the demand side

In this paper, Congestion Relief Management (CRM) plays a significant role in power system operation under todaypsilas deregulated environments. We tried to review different established methods of congestion relief management and propose new concepts to improve it. The CRM plays two major functions; firstly, to maintain a power system within the security limits and secondly, to define congestion relief charge, revising, and paying to market participants. The proposed method is based on congestion relief indices (CRI) which can be used for selecting the offers. This paper compares two market-clearing procedures for CRM in terms of supply side management (SSM) only and economical efficiency of demand side management (SSM) to avoid transmission congestion in an optimum manner. We also propose a zonal-based congestion relief management approach (ZCMA) to better relieve the congested lines in large systems. These zones are determined based on the lines active power from sensitivity index / the congestion relief index (CRI). We also use the supply and demand side management (SSM & DSM) in the most sensitive zones, with strongest distribution of sensitive indices to identify and reschedule their real power and improve the congestion relief management. The applied numerical studies are based on wood & Wallenberg 6-bus system & also the 30-bus system of IEEE.