Hydro unit commitment and loading problem for day-ahead operation planning problem

• Published in: International journal of electrical power & energy systems Vol. 44; no. 1; pp. 7 - 16
• Main Authors: Cristian Finardi, Erlon, Reolon Scuzziato, Murilo
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.01.2013; Elsevier
• Subjects: Applied sciences; Electric power plants; Electrical engineering. Electrical power engineering; Electrical machines; Electrical power engineering; Exact sciences and technology; Hydro unit commitment and loading problem; Hydroelectric power plants; Hydropower function; Inexact Augmented Lagrangian; Lagrangian relaxation; Miscellaneous; Operation. Load control. Reliability; Power networks and lines; Special rotating machines; South America; Brazil; America; Inexact Augmented Lagrangian; Hydro unit commitment and loading problem; Hydropower function; Lagrangian relaxation; Dispatching problem; Lagrangian; Power system planning; Power distribution planning; Scheduling; Hydroelectric power; Forecasting management; Electrical network; Relaxation method; Installed capacity; Mechanical loss; Turbine generator; Mathematical model; Lagrangian method; Cascade connection
• ISSN: 0142-0615; 1879-3517
• DOI: 10.1016/j.ijepes.2012.07.023

► A new hydropower function with mechanical and electrical losses explicitly included. ► An efficient solution strategy based on dual decompositions techniques. ► Solution Strategy Improvements based on alternative warm-start procedure. We describe a new model for the hydro unit commitment and loading (HUCL) problem that has been developed to be used as a support tool for day-ahead operation in the Brazilian system. The objective is to determine the optimal unit commitment and generation schedules for cascaded plants with multiple units and a head-dependent hydropower model. In this paper, we propose a new mathematical model for the hydropower function where the mechanical and electrical losses in the turbine-generator are included. We model the HUCL problem as a nonlinear mixed 0–1 programming problem and solve it with a strategy that includes a two-phase approach based on dual decomposition. The computational tool allows the model to effectively schedule hydro units for the problem in the Brazilian regulatory framework. Application of the approach is demonstrated by determining a 24-time step HUCL schedule for four cascaded plants with 4170MW of installed capacity.