This paper presents a mixed-integer linear programming (MILP) reformulation of the thermal unit commitment (UC) problem. The proposed formulation is simultaneously tight and compact. tighter characteristic reduces search space more compact increases searching speed with which solvers explore that reduced space. Therefore, as natural consequence, significantly computational burden in comparison analogous MILP-based UC formulations. We provide results comparing two others have been recognized...

Growing load factors in winter and summer peaks are a serious problem faced by the Spanish electric energy system. This has led to extensive use of peak plants thus higher costs for whole Wind represents strongly increasing percentage overall electricity production, but wind normally does not follow typical demand profile. As generation flexibility is limited due technical restrictions, absence large storages, other side equilibrium generation-demand react. Demand management measures intend...

Hydrogen can be key in the energy system transition. We investigate role of offshore hydrogen generation a future integrated system. By performing optimisation model application Northern-central European and North Sea grid towards 2050, we find that may likely only play limited role, wind has higher value when sent to shore form electricity. Forcing all would lead increased costs. Under assumed scenario conditions, which result deep decarbonisatiton – both onshore follows solar PV patterns....

This paper presents a mixed-integer linear programming (MILP) formulation of start-up (SU) and shut-down (SD) power trajectories thermal units. Multiple SU power-trajectories costs are modeled according to how long the unit has been offline. The proposed significantly reduces computational burden in comparison with others commonly found literature. is because 1) tighter, i.e., relaxed solution nearer optimal integer solution; 2) more compact, it needs fewer constraints, variables nonzero...

This paper deals with the design of underground rail system timetables that synchronize movement trains to allow energy consumption from substations be reduced by maximizing use regenerative-braking energy. Nowadays, most are equipped systems and any this recovered not used on-board auxiliary services can consumed other in same section. A mathematical programming optimization model has been designed braking arriving at station acceleration exiting or another station. In addition, a power...

Security-constrained unit commitment (SCUC) problem is one of the necessary tools for system operators to make operational planning and real-time operation. The internalization transmission network security constraints (e.g., N-1 criterion) could lead different decisions in generation dispatch. However, computational burden this challenging mainly due its inherent large size. Therefore, paper proposes an constrained formulation based on line outage distribution factors (LODF) instead...

Carbon Capture and Storage (CCS) might be a central technology to reach the decarbonisation goals of European energy system. However, CCS deployment faces multiple economic, technological, infrastructure challenges. Related literature tends only focus on certain aspects or limited particular sector perspective. In contrast, this paper presents holistic modelling framework analyse long-term perspectives in Europe by extending typical analysis from electricity industry sector, including CO2...

An unprecedented process of reforms has shaken the power industry during last two decades. In order to sell energy produced by their plants, many generation companies are now forced prepare and submit daily offers an electricity market under uncertainty about submitted rivals. this paper, we describe a methodology optimal for company operating in day-ahead organized as series 24 hourly uniform-price multiunit double auctions. We explicitly consider ability affect price well company's rivals'...

In the coming years, an extensive development of large-scale offshore wind farms (OWFs) is foreseen in Europe. Electric power systems OWFs need to be optimized order minimize investment and operational costs. This paper proposes a comprehensive decision support model that covers three key factors characterize design ac electric OWFs: costs components, system efficiency, reliability. Stochasticity speed reliability main components are also considered. The decisions concern layout...

Electrical layout design is a key element in offshore wind farm planning, with critical impact on both plant cost and reliability. Offshore Windfarm Layout optimizer (OWL) has been developed to efficiently find optimal electrical layouts affordable computation times. The tool includes the possibility of HVDC connection incorporates an approximation losses, as well stochasticity inputs component failures. OWL applied several case studies including Barrow Wind Farm. produces significant...

This paper provides the convex hull description for basic operation of slow- and quick-start units in power-based unit commitment (UC) problems. The operating constraints that are modeled both types (1) generation limits (2) minimum up down times. Apart from this, startup shutdown processes also modeled, using (3) power trajectories slow-start units, (4) capabilities units. In conventional UC problem, schedules used to represent staircase energy schedule; however, this simplification leads...

The day-ahead unit-commitment (UC)-based market-clearing (MC) is widely acknowledged to be the most economically efficient mechanism for scheduling resources in power systems. In conventional UC problems, schedules are used represent staircase energy schedule. However, realizability of this schedule cannot guaranteed due violation ramping limits, and hence formulations do not manage flexibility generating units efficiently. This paper provides a UC-based MC formulation, drawing clear...

This paper provides the convex hull description of single thermal Unit Commitment (UC) problem with following basic operating constraints: (1) generation limits, (2) start-up and shut-down capabilities, (3) minimum up down times. The proposed constraints can be used as core any unit commitment formulation to strengthen lower bound in enumerative approaches. We provide evidence that dramatic improvements computational time are obtained by solving self-UC network-constrained UC new...

Private investors, flexibility, efficiency and environmental requirements from deregulated markets have led the existence building of a significant number combined-cycle gas turbines (CCGTs) in many power systems. These plants represent complex optimization problem for short-term planning unit commitment (UC) carried out by independent system operators due to their multiple operating configurations. Accordingly, this paper proposes mixed-integer linear programming (MIP) formulation...

This paper introduces a bi-level decentralized model for organizing the Local Congestion Management Market (LCMM) in renewable-based distribution systems with active participation of Energy Communities (ECs) and Internet Data Centers (IDCs). At upper level, system operator (DSO) tackles an optimization problem to identify congested lines considering network security constraints clearing results Day-Ahead (DAEM). The lower level encompasses strategic planning from ECs IDCs, aimed at...

We propose a stochastic unit commitment model for power generation company that takes part in an electricity spot market. The relevant feature of this is its detailed representation the market during whole week, including seven day-ahead sessions and corresponding adjustment sessions. can be seen as hour-ahead mechanism. This into account influence company's decisions exert on market-clearing price by means residual demand curve each session. introduce uncertainty form several possible...

This paper proposes a power-based network-constrained unit commitment (UC) model as an alternative to the traditional deterministic UCs deal with wind generation uncertainty. The formulation draws clear distinction between power-capacity and ramp-capability reserves production These power ramp requirements can be obtained from forecast information. is formulated UC, which schedules power-trajectories instead of energy-blocks takes into account inherent startup shutdown trajectories thermal...

Abstract Wind turbine spacing is an important design parameter for wind farms. Placing turbines too close together reduces their power extraction because of wake effects and increases maintenance costs unsteady loading. Conversely, placing them further apart land cabling costs, as well electrical resistance losses. The asymptotic limit very large farms in which the flow conditions can be considered ‘fully developed’ provides a useful framework studying general trends optimal layouts function...