Evaluation of Transmission Congestion Cost for Multi-area Electric Power Systems
Transmission planning in the modern paradigm of deregulation is a delicate balancing act, for deregu-lation has made transmission planning more difficult. (1) The objective of transmission planning in a deregulated environment differs from that in a regulated one. (2) Uncertainties in deregulated power systems are much greater than those in regulated ones. (3) Various obstacles, such as the environ-mental movement, public protests and higher cost of facility construction, make it more difficult to construct new transmission facilities or to reinforce the existing congested ones. Therefore, how to decide transmission expansion plans under an open-access environment is of critical importance. Moreover, patterns of electricity trading in the electricity markets have diversified making, transmis-sion expansion planning more difficult. Especially, transmission expansions affect the interests of electricity network users such as market participants unequally. For these reasons, transmission expan-sion plans under an open-access environment must be decided carefully. In order to maintain transpar-ency and be able to provide transmission expansion plans for electric network users, the effects of the plans must be evaluated with consideration of both the economic merit of electricity trade and main-taining the reliability of electricity supply. This paper presents a framework for evaluating interconnected multi-area transmission network ex-pansion plans using economic and supply reliability indices based on transmission congestion cost as economic index and unserved energy as a reliability index. These indices are evaluated with consid-eration of unplanned generators’ outages and N-1 contingency criterion for interconnected transmis-sion lines and regional transmission lines in multi-area interconnected power systems. Moreover, re-gional unserved energy is calculated with consideration of combinations of regional demand reduction and interchange power among interconnected regions. Though a regional transmission expansion re-duces transmission congestion in the regional transmission network, the expansion may increase transmission congestion in interconnection transmission lines or other regional transmission lines.
Interconnection Transmission Line Transmission Expansion Supply Reliability Multi-area Power Systems Unserved Energy Total Generation Cost Contingency Analysis
Ken Furusawa Kenji Okada
Socio-Economic Research Center, CRIEPI, Japan Graduate School of Engineering, Tohoku University and CRIEPI Japan
国际会议
桂林
英文
1-6
2009-10-28（万方平台首次上网日期，不代表论文的发表时间）