Seminar: Power System Optimization Modelling: Integrating the unit commitment with the generation expansion planning problem by Nikolaos E. Koltsaklis


Department of Industrial Engineering 


Power System Optimization Modelling: Integrating the unit commitment with the generation expansion planning problem


Nikolaos E. Koltsaklis

University of Western Macedonia, Greece



The long-term Generation Expansion Planning problem determines the optimal type of energy technologies, size, location, and time construction of new power generation plants while minimizing total cost over a long planning horizon and being subject to a series of constraints. Due to its complex nature, its effective implementation requires the consideration of a wide range of aspects, including economic, environmental, regulatory, technical, operational, social, and potential interdependencies with other complementary sectors. As a consequence, the traditional cost-based approaches have been extensively modified and updated, leading to more advanced ones, including, at least partially, some of the above-described aspects. This work presents a generic mixed-integer linear programming (MILP) model that integrates the unit commitment problem, i.e., daily energy planning, with the long-term generation expansion planning framework. Typical daily constraints at an hourly level such as start-up and shut-down related decisions (start-up type, minimum up and downtime, synchronization, soak and desynchronization time constraints), ramping limits, system reserve requirements are combined with representative yearly constraints such as power capacity additions, power generation bounds of each unit, peak reserve requirements, and energy policy issues (renewables penetration limits, CO2 emissions cap, and pricing). For modeling purposes, a representative day (24 h) of each month over a number of years has been employed in order to determine the optimal capacity additions, electricity market-clearing prices, and daily operational planning of the studied power system. The model has been tested on an illustrative case study of the Greek power system. This approach aims to provide useful insight into strategic and challenging decisions to be determined by investors and/or policymakers at a national and/or regional level by providing the optimal energy roadmap under real operating and design constraints.



Nikolaos Koltsaklis is currently an adjunct Assistant Professor at the University of Western Macedonia in Greece. He continues his post-doctoral research in the same university, as well as the universities of Piraeus (Greece) and Czech Technical University in Prague (Czech Republic), in the context of relevant research programs. He has significant experience in energy system modeling, with a particular focus on power systems and markets. He also has experience working within power utilities, besides developing models for the needs of their daily and yearly operations. His research interests include themes related to unit commitment, long-term energy planning, flexibility issues, decentralized energy systems, and sector coupling.

Date: Thursday, June 17, 2021


Online Seminar Link:

Meeting ID: 969 4557 2901
Passcode: 335897