Jorge Pereira, Ana Viana, Bogdan G. Lucus and Manuel Matos
The purpose of this paper is to solve the problem of committing electric power generators (unit commitment, UC), considering network constraints.
Abstract
Purpose
The purpose of this paper is to solve the problem of committing electric power generators (unit commitment, UC), considering network constraints.
Design/methodology/approach
The UC is first solved with a local search based meta‐heuristic, following the assumption that all generators and loads are connected to a single network node. For evaluation purposes, the economical production levels of the units committed are computed by running a pre‐dispatch algorithm where network constraints are not included. If a good quality solution is reached, an economic dispatch (ED) with network constraints is performed, where the geographic location of generators and loads are considered. Therefore, the production level of each committed generator is performed that leads to the global lowest solution cost, regarding both the generators' costs and constraints and the power system network constraints.
Findings
The algorithm proposed is computationally efficient, given the time available for decision making. In addition, the solution for this algorithm, in terms of minimization of total costs, is generally better than the solution of the two phases approach. Some contractual and legal aspects related with the injection in network connections can also be included in the model.
Practical implications
UC with network constraints has a large potential of use, especially for small and medium size power systems. It reflects reality in a closer way and provides a more complete and realistic knowledge about the system in operation.
Originality/value
The paper presents an approach where the ED with network constraints is integrated with the UC procedure. The model described is currently implemented in an EMS package offered in the market – making it a case of successful transfer from science to industry.
Details
Keywords
The purpose of this paper is to conduct an action‐research study of metaphors and metaphoric fragments composed by graduate students in 17 teams in two business (MBA) and three…
Abstract
Purpose
The purpose of this paper is to conduct an action‐research study of metaphors and metaphoric fragments composed by graduate students in 17 teams in two business (MBA) and three educational administration courses taught by the same instructor and action‐researcher.
Design/methodology/approach
The methodology of the paper was action‐research conducted directly by the instructor and indirectly by the business and education graduate students who participated in the study. Participants (74) were aspiring leaders in business and educational leadership programs at a private university in New York. The instructor and action‐researcher utilized participants' metaphors or metaphoric fragments (i.e. glimpses of a metaphor) as an instructional technique to compare and further understand the team process in both disciplines.
Findings
The findings in the paper indicated that an analysis of metaphors or metaphoric fragments enabled the instructor to develop a multiple perspective of various team stages and revise an action‐plan (or syllabus) that would expand the use of metaphors as a diagnostic tool for team development.
Originality/value
The originality of the paper is that it is cross‐disciplinary, and compares metaphors from aspiring leaders within the disciplines of business and education. The value of the study is that it may influence the development of other action‐research team studies on the university level.