A Study Of Security-Constrained Economic Dispatch In Power Market

Realizing the safe and economic operation of electric power system has great meaning to the development of country's economy, so the electric power technicians and scholars always pay much attention to the electric power system security economic dispatch problem. Along with the development of power market, security economic dispatch problem faces many new problems: first, because of the asymmetry of the structure and distribution of electrical sources, to realize the configuration of electric power resource of whole country, the exchange of electric power between areas which most of the form is bilateral transaction is getting more and more frequent, so the economic dispatch must adapt itself to this demand; second, for maximum profit, there will bring antinomy between the security of transmission network and the free transmission of electric power, that is in given transmission network, if the free transmission of electric power is too emphasized, the electric system will breakdown; whereas if the security of transmission network is too emphasized, the market will be lost. In power market environment, system operator will reduce the security margin of transmission system for more profit by considering that the preconceived contingency may not really happen. Therefore, the transmission limits of lines in area and ties between areas must consider at one time in the model of security economic dispatch between areas.In this paper, first we introduce the definition of power system security economic dispatch under power market environment and the OPF problem (which can consider security and economy at the same time), describe several classical algorithms of. OPF, stress the analysis of linear programming used by this paper. Then we calculate the total transmission capacity and security dispatch problem under all kinds of mathematic model in the power market environment through IEEE30 nodes system and Sichuan practical network, receive satisfying results, and the main content is as follows:(1) Based on the definition of total transmission capacity, we found a mathematic model which objective is maximizing the exchange power between areas and subject to power flow equilibrium equation, limits of active and reactive power output of generators, transmission power flow and nodes' voltage, without considering the dynamic limits...