Comparer des méthodes

	Boucle à verrouillage de phase	Engagement des unités
Domaine	Génie électrique	Génie électrique
Famille	Process / pipeline	Process / pipeline
Année d'origine	1966	1959
Auteur d'origine	Floyd M. Gardner	Charles J. Baldwin
Type	Feedback control loop for frequency and phase synchronization	Combinatorial optimization for generator turn-on/turn-off scheduling
Source fondatrice	Gardner, F. M. (1966). Phaselock Techniques. Wiley & Sons.	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	PLL, Phase lock, Frequency synchronizer	UC, Generator Commitment, Thermal Unit Scheduling
Apparentées	3	3
Résumé	A Phase-Locked Loop (PLL) is a feedback control system that synchronizes an output oscillator to match the phase and frequency of an input signal. Introduced by Gardner in 1966, PLLs are ubiquitous in communications, radar, clock distribution, and power systems. The PLL continuously adjusts its oscillator frequency to minimize the phase error with the input, achieving lock. PLLs are fundamental to modern electronic systems.	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.