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Ingeniería y Ciencia

Print version ISSN 1794-9165


LOPEZ-LEZAMA, Jesús María; GRANADA-ECHEVERRI, Mauricio  and  GALLEGO-PAREJA, Luis A. A combined pool/bilateral dispatch model for electricity markets with security constraints. ing.cienc. [online]. 2011, vol.7, n.13, pp.7-28. ISSN 1794-9165.

The secure operation of the electric power system is a challenging task for the system operator which is responsible of its coordination, control and monitoring. In most power systems security is typically handled on a multi-state approach. In which case, security criteria are incorporated by means of additional constraints, modifying the initial dispatch calculation. In this paper a generation dispatch model for competitive energy markets considering security constraints is presented. The proposed approach combines the generation dispatch related to pool and bilateral markets with coupled post-contingency optimal power flows into a single optimal dispatch model, avoiding economic inefficiencies that appear in conventional multi-stage dispatch approaches. The proposed model is linear, and as such, it is based on a DC model of the network. A 6-bus didactic system and the IEEE RTS-24 bus test system are used in order to show the operation and effectiveness of the proposed approach and to compare it with the basic pool/bilateral dispatch with no security constraints. Results show that the inclusion of security constraints lead to a higher dispatch cost. Furthermore, it was found that the enforcement of firmed bilateral contracts might lead to system congestion.

Keywords : optimal dispatch; bilateral contracts; energy markets.

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