เปรียบเทียบวิธี

	Phase-Locked Loop	การควบคุมแบบดรอป (Droop Control)
สาขาวิชา	วิศวกรรมไฟฟ้า	วิศวกรรมไฟฟ้า
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	1966	2013
ผู้ริเริ่ม	Floyd M. Gardner	Juan M. Guerrero
ประเภท	Feedback control loop for frequency and phase synchronization	Decentralized control for synchronous operation of distributed generators
แหล่งต้นตำรับ	Gardner, F. M. (1966). Phaselock Techniques. Wiley & Sons.	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.
ชื่อเรียกอื่น	PLL, Phase lock, Frequency synchronizer	Frequency droop, Voltage droop, Decentralized control
ที่เกี่ยวข้อง	3	3
สรุป	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.	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.