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	Unit Commitment	Ekonomisk drift (ED)	Estimering av elkraftsystemets tillstånd
Ämnesområde	Elektroteknik	Elektroteknik	Elektroteknik
Familj	Process / pipeline	Process / pipeline	Process / pipeline
Ursprungsår	1959	1958	1970
Upphovsperson	Charles J. Baldwin	Lester K. Kirchmayer	Fred Schweppe
Typ	Combinatorial optimization for generator turn-on/turn-off scheduling	Continuous optimization for allocating power output among committed generators	Real-time state estimation using measurements and physical models
Ursprungskälla	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.	Kirchmayer, L. K. (1958). Economic Operation of Power Systems. Wiley & Sons.	Schweppe, F. C., & Wildes, J. (1970). Power system static-state estimation: III system implementation. IEEE Transactions on Power Apparatus and Systems, 89(1), 120-125.
Alias	UC, Generator Commitment, Thermal Unit Scheduling	ED, Least-Cost Generation Dispatch	PSSE, WLS State Estimation, Power Flow State Estimation
Närliggande	3	3	3
Sammanfattning	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.	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.	Power System State Estimation (PSSE) is a real-time algorithm that estimates the voltage and phase angle at every bus in a power grid from a set of noisy, redundant measurements. Introduced by Schweppe in 1970, it combines measurements (power flows, voltage magnitudes) with the physical power flow model to produce the most likely system state. State estimation is the foundation of modern grid control centers, providing operators with an accurate digital representation of the actual network.