방법 비교

	드로프 제어	위상 고정 루프	단위 계획 (Unit Commitment, UC)
분야	전기공학	전기공학	전기공학
계열	Process / pipeline	Process / pipeline	Process / pipeline
기원 연도	2013	1966	1959
창시자	Juan M. Guerrero	Floyd M. Gardner	Charles J. Baldwin
유형	Decentralized control for synchronous operation of distributed generators	Feedback control loop for frequency and phase synchronization	Combinatorial optimization for generator turn-on/turn-off scheduling
원전	Guerrero, J. M., Vasquez, J. C., Matas, J., Castilla, M., & de Vicuña, L. G. (2013). Hierarchical control of droop-controlled AC and DC microgrids. IEEE Transactions on Power Electronics, 28(11), 4915-4933.	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.
별칭	Frequency droop, Voltage droop, Decentralized control	PLL, Phase lock, Frequency synchronizer	UC, Generator Commitment, Thermal Unit Scheduling
관련	3	3	3
요약	Droop Control is a decentralized control method that enables independent generators (inverters, microgrids) to operate synchronously without direct communication. Introduced by Guerrero et al. in 2013 for microgrids, droop control uses frequency and voltage deviations as signals to share power. By making generator output depend on frequency and voltage (like synchronous generators), microgrids achieve plug-and-play operation. Essential for modern distributed energy resources and grid resilience.	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.