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	Estimering av elkraftsystemets tillstånd	Unit Commitment
Ämnesområde	Elektroteknik	Elektroteknik
Familj	Process / pipeline	Process / pipeline
Ursprungsår	1970	1959
Upphovsperson	Fred Schweppe	Charles J. Baldwin
Typ	Real-time state estimation using measurements and physical models	Combinatorial optimization for generator turn-on/turn-off scheduling
Ursprungskälla	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.	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	PSSE, WLS State Estimation, Power Flow State Estimation	UC, Generator Commitment, Thermal Unit Scheduling
Närliggande	3	3
Sammanfattning	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.	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.