Optimization and Systems Theory Seminar
Friday, June 8, 2001, 11.00-12.00, Room 3721, Lindstedtsvägen 25

Erik Dotzauer
Birka Energi AB
E-mail: erik.dotzauer@birkaenergi.se

Energy system operation by Lagrangian relaxation

Due to its relatively high total energy efficiency, the application of cogeneration, i.e. simultaneous exploitation of power and heat from the energy transformation process, is receiving increased attention. In order to improve the operation of such systems, it is necessary to have detailed and reliable optimization models and methods available. The same is also desirable for pure heating systems, and for pure power systems. However, finding the optimal plan for production of heat and power, possibly also taking into account the optimal use of storage devices, is a difficult optimization problem.

Finding the optimal production schedule for the near future is known as the short-term planning problem or the unit commitment and economic dispatch problem. Typically a time horizon of up to one week, partitioned into one-hour time intervals, is considered. The problem may be characterized as a nonlinear mixed integer optimization problem, often large scale. The present talk deals with mathematical models and Lagrangian relaxation based algorithms for short-term planning of cogeneration and power systems. The aim is to present ideas and theories that may be exploited in such algorithms to make them more efficient.

Calendar of seminars
Last update: May 10, 2001 by Anders Forsgren, anders.forsgren@math.kth.se.