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Energies 2019, 12(6), 966; https://doi.org/10.3390/en12060966

Online Economic Re-dispatch to Mitigate Line Overloads after Line and Generation Contingencies

1
Departamento de Energía Eléctrica y Automática, Facultad de Minas, Universidad Nacional de Colombia, Sede Medellín, Carrera 80 No. 65-223, Campus Robledo, Medellín 050041, Antioquia, Colombia
2
Escuela de Física, Facultad de Ciencias, Universidad Nacional de Colombia, Sede Medellín, Carrera 65 No. 59A-110, Medellín 050034, Antioquia, Colombia
*
Author to whom correspondence should be addressed.
Received: 15 February 2019 / Revised: 5 March 2019 / Accepted: 9 March 2019 / Published: 13 March 2019
(This article belongs to the Special Issue Optimization Methods Applied to Power Systems Ⅱ)
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Abstract

This paper presents an online economic re-dispatch scheme based on the generation cost optimization with security constraints to mitigate line overloads before and after line and generation contingencies. The proposed optimization model considers simplification of mathematical expressions calculated from online variables as the power transfer distribution factor (PTDF) and line outage distribution factor (LODF). Thus, a first algorithm that calculates economic re-dispatch for online operation to avoid overloads during the normal operation and a second algorithm that calculates online emergency economic re-dispatch when overloads occur due to line and generator contingencies are proposed in this paper. The results show that the proposed algorithms avoid overload before and after contingencies, improving power system security, and at the same time reducing operational costs. This scheme allows a reduction of power generation units in the electricity market during online operation that considers line overloads in the power system. View Full-Text
Keywords: electricity markets; economic dispatch; optimization; maximum capacity; online operation; power system; unit commitment electricity markets; economic dispatch; optimization; maximum capacity; online operation; power system; unit commitment
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Arenas-Crespo, O.; Candelo-Becerra, J.E.; Hoyos Velasco, F.E. Online Economic Re-dispatch to Mitigate Line Overloads after Line and Generation Contingencies. Energies 2019, 12, 966.

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