Inter-area Power Exchange Coordination in the Large- Scale Power Systems
As electricity markets continue to expand beyond traditional state or national boundaries, inter-area energy trading presents new technical and economic challenges. Interconnected power networks must be flexible enough, every second of every day, to accommodate the nation’s growing demand for reliable and affordable electricity. The open access to transmission services will stimulate more intensive utilization of interconnected networks, promote competition, and provide customers with more choices. However, transmission lines are operated closer to their limits more frequently and the use of networks close to their ultimate ratings leads to a fear of line overloading as well as the incorporation of several security constraints. Accordingly, transmission companies are facing several challenges including the assessment of the optimal transfer capability that indicates an ability of power systems to reliably increase transferred power between areas or zones. As electric power systems to expand beyond traditional state due to an increasingly competitive market, transmission open access enables power transactions to take place between remote locations which may be separated by one or more control areas. It is therefore necessary to have a central entity be operated coordinately so that the power transactions between different locations can be managed securely and without congestion. Under such environment, small-signal stability, often in the form of low frequency oscillations, has been found to be the limiting factor when determining power transfer capabilities in a number of power systems. This is getting more likely in a competitive environment as the system operation point tends to be pushed closer to the stability limit. In this research, we provide global strategy for finding optimal re-dispatching of either area exchanges or generation schedules for the improvement and coordination of transmission path transfers. The effectiveness of the proposed methodology is illustrated by a system representing interconnected New England Test system (NETS) and New York Power System (NYPS). Since a numerical example shows that it is possible to improve the inter-area stability margin, by the performance of coordination strategy, our approach has proved to make more efficient and much more promising in the current power market. In addition, the proposed approach can be used for maximizing the profits of a specific path owner without endangering system security and stability. By taking advantage of inter-area tie line flow coordination, therefore, the potential danger to the system security can be reduced significantly, and then our attempts make it possible to satisfy their demand. As a result, the optimal solution obtained by the proposed coordination strategy will give useful guidelines to the TSOs and power merchants.
Coordination strategy-Damping ratio criteria- Cayley transformation-Inter-area oscillations-Transfer capability
Mun-Kyeom Kim Jong-Keun Park Yong-Tae Yoon Young-Hwan Moon
Seoul National University, Republic of Korea Korea Electrotechnology Research Institute (KERI), Republic of Korea
国际会议
桂林
英文
1-8
2009-10-28（万方平台首次上网日期，不代表论文的发表时间）