Abstract:
At present, electricity is one of the most important necessities for life. One can say that human activities can never continue smoothly without it. In transmission of electric energy from source to end-user, if the amount of energy is too large, it will affect system security in the future, which decreases margin between the system operating condition and its limits. From above reason, in 1995, North America Electric Reliability Council (NERC) has proposed concepts and definitions of total transfer capability, which is defined as the maximum amount of power that can be reliably transferred over the interconnected transmission systems between a pair of defined source and sink. Both of them can be either a single bus, group of buses, or areas. The methodology to evaluate the area-based power transfer capability and its physical meaning are proposed in this thesis. It classifies the power transfer capability into two categories, maximum power transfer capability and security-concern power transfer capability. In addition, the proposed contingency index incorporated with Monte Carlo simulation method is applied to take impacts of contingency in transmission system to power transfer capability into account. Finally, the risk level concept and probabilistic approach are proposed to define the optimal power transfer capability. This proposed concept can be used as a tool to help the system operator regulate the power system more efficiently. The methods proposed in this thesis have been tested with the IEEE-118 bus system. Satisfactory results are obtained.