Artículos de revistas
Modelo AC para el despacho combinado de contratos bilaterales y bolsa de energía considerando restricciones de seguridad
Ingenieria y Universidad, v. 13, n. 2, p. 227-249, 2009.
Universidad Nacional de Colombia
Universidad de Antioquia
Universidad Tecnológica de Pereira
Universidade Estadual Paulista (UNESP)
Reliability is a key aspect in power system design and planning. Maintaining a reliable power system is a very important issue for their design and operation. Under the new competitive framework of the electricity sector, power systems find ever more and more strained to operate near their limits. Under this new scenario, it is crucial for the system operator to use tools that facilitate an energy dispatch that minimizes possible power cuts. This paper presents a mathematical model to calculate an energy dispatch that considers security constraints (single contingencies in transmission lines and transformers). The model involves pool markets and fixed bilateral contracts. Traditional methodologies that include security constraints are usually based in multistage dispatch processes. In this case, we propose a single-stage model that avoids the economic inefficiencies which result when conventional multi-stage dispatch approaches are applied. The proposed model includes an AC representation of the transport system and allows calculating the cost overruns incurred in due to reliability restrictions. We found that complying with fixed bilateral contracts, when they go above certain levels, might lead to congestion problems in transmission lines.
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Freitas, Luiz C. G.; Lima, Gustavo B.; Gonçalves, Flávio A. S.; Melo, Guilherme A.; Canesin, Carlos A.; De Freitas, Luiz C.
Universidade Federal de Uberlândia (UFU); Universidade Estadual Paulista (UNESP) (2009-12-01)This paper proposal presents the development and the experimental analysis of a new single-phase hybrid rectifier structure with high power factor (PF) and low harmonic distortion of current (THDI), suitable for application ...
Proposal of a hybrid rectifier structure with HPF and low THD suitable for front-end trolleybuses systems supplied by AC distribution networks Freitas, Luiz C.G.; Lima, Gustavo B.; Gonçalves, Flávio A.S.; Melo, Guilherme A.; Canesin, Carlos A.; De Freitas, Luiz C.