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	Ekonomisk drift (ED)	Snabbkopplad effektflödesmetod	Unit Commitment
Ämnesområde	Elektroteknik	Elektroteknik	Elektroteknik
Familj	Process / pipeline	Process / pipeline	Process / pipeline
Ursprungsår	1958	1972	1959
Upphovsperson	Lester K. Kirchmayer	Brian Stott, Octave Alsac	Charles J. Baldwin
Typ	Continuous optimization for allocating power output among committed generators	Decoupled iterative solution method for power system analysis	Combinatorial optimization for generator turn-on/turn-off scheduling
Ursprungskälla	Kirchmayer, L. K. (1958). Economic Operation of Power Systems. Wiley & Sons.	Stott, B., & Alsac, O. (1972). Fast decoupled load flow. IEEE Transactions on Power Apparatus and Systems, 91(3), 859-869.	Baldwin, C. J., Dale, K. M., & Dittrich, R. F. (1959). A study of the economic shutdown of generating units in daily dispatch. AIEE Transactions, 78(3), 272-282.
Alias	ED, Least-Cost Generation Dispatch	FDLF, Fast Decoupled Load Flow	UC, Generator Commitment, Thermal Unit Scheduling
Närliggande	3	3	3
Sammanfattning	Economic Dispatch (ED) is the process of optimally allocating power output among committed generators to meet demand at minimum fuel cost. Introduced by Kirchmayer in 1958, ED is a fundamental real-time optimization problem solved every few minutes in power system operations. Unlike Unit Commitment (which decides generator on/off), ED assumes generators are already committed and focuses on splitting load most economically. ED's rapid feedback enables efficient real-time power plant operations.	The Fast Decoupled Load Flow (FDLF) method, introduced by Stott and Alsac in 1972, exploits the weak coupling between active and reactive power in power systems to accelerate convergence beyond standard Newton-Raphson. By decoupling the equations and using constant, approximate Jacobians, it reduces computation per iteration while maintaining acceptable accuracy for most practical systems. This method remains widely used in operational software for its speed and numerical stability.	Unit Commitment (UC) is the problem of deciding which power generation units should be switched on or off over a planning horizon (typically 24-168 hours) to minimize total operating cost while meeting demand and reserve requirements. Introduced by Baldwin et al. in 1959, UC is a fundamental scheduling problem in power system operations, combining combinatorial optimization (which units to commit) with continuous optimization (optimal power output). UC remains one of the most important and computationally challenging problems in power systems.