Germán Morales-España

Tight and Compact MIP Formulation of Configuration-Based Combined-Cycle Units

  • Carlos M. Correa-Posada
  • Germán Morales-España
  • Andres Ramos
    • Categories (Mixed) Integer Linear Programming, Applications - OR and Management Sciences Tags , , ,

    Private investors, flexibility, efficiency and environmental requirements from deregulated markets have led the existence and building of a significant number of combined-cycle gas turbines (CCGTs) in many power systems. These plants represent a complicated optimization problem for the short-term planning unit commitment (UC) carried out by independent system operators due to their multiple operating configurations. … Read more

    Robust Unit Commitment with Dispatchable Wind: An LP Reformulation of the Second Stage

  • Germán Morales-España
    • Categories Applications - Science and Engineering, Robust Optimization Tags , , ,

    Abstract— The increasing penetration of uncertain generation such as wind and solar in power systems imposes new challenges to the Unit Commitment (UC) problem, one of the most critical tasks in power systems operations. The two most common approaches to address these challenges — stochastic and robust optimization — have drawbacks that prevent or restrict their … Read more

    Tight MIP Formulations of the Power-Based Unit Commitment Problem

  • Claudio Gentile
  • Germán Morales-España
  • Andres Ramos
    • Categories (Mixed) Integer Linear Programming, Scheduling Tags , , , , ,

    This paper provides the convex hull description for the basic operation of slow- and quick-start units in power-based unit commitment (UC) problems. The basic operating constraints that are modeled for both types of units are: 1) generation limits and 2) minimum up and down times. Apart from this, the startup and shutdown processes are also … Read more

    A Tight MIP Formulation of the Unit Commitment Problem with Start-up and Shut-down Constraints

  • Claudio Gentile
  • Germán Morales-España
  • Andres Ramos
    • Categories (Mixed) Integer Linear Programming, Scheduling Tags , ,

    This paper provides the convex hull description for the following basic operating constraints of a single power generation unit in Unit Commitment (UC) problems: 1) generation limits, 2) startup and shutdown capabilities, and 3) minimum up and down times. Although the model does not consider some crucial constraints, such as ramping, the proposed constraints can … Read more

    Power-Capacity and Ramp-Capability Reserves for Wind Integration in Power-Based UC

  • Ross Baldick
  • Germán Morales-España
  • Javier García-González
  • Andres Ramos
    • Categories Applications - OR and Management Sciences, Robust Optimization, Stochastic Programming Tags , , , ,

    This paper proposes a power-based network-constrained unit commitment (UC) model as an alternative to the traditional deterministic UCs to deal with wind generation uncertainty. The formulation draws a clear distinction between power-capacity and ramp-capability reserves to deal with wind production uncertainty. These power and ramp requirements can be obtained from wind forecast information. The model … Read more