Title :
The sag detection strategy for seamless transfer APF-UPS system
Author :
Kook-Nam Sung ; Woo-Cheol Lee ; Taeck-Ki Lee
Author_Institution :
Dept. of Electr. Eng., HanKyong Nat. Univ., Ansung, South Korea
Abstract :
In this paper, when voltage sag of the normal grid voltage occurs, detecting the peak voltage for fast mode transfer method is proposed. The conventional detector of sag voltage used in synchronous d-q frame by Digital Phase-Locked-Loop(DPLL). However using this method, the delay time is longer. Despite the sag occurrence of grid voltage, it cannot reflect a sudden change of the grid voltage in the moment of voltage sag, which causes a resulted peak value to be significantly distorted and momentary interruption. Sag detection method is proposed by reducing the delay time caused by these sag. Its effectiveness and capability in instantly detecting are verified via PSIM simulations and experimental results.
Keywords :
active filters; delays; digital phase locked loops; power grids; power harmonic filters; power supply quality; uninterruptible power supplies; DPLL; PSIM simulations; delay time reduction; digital phase-locked-loop; fast mode transfer method; momentary interruption; normal grid voltage sag detection strategy; seamless transfer APF-UPS system; synchronous d-q frame; Insulated gate bipolar transistors;
Conference_Titel :
Vehicle Power and Propulsion Conference (VPPC), 2012 IEEE
Conference_Location :
Seoul
Print_ISBN :
978-1-4673-0953-0
DOI :
10.1109/VPPC.2012.6422589
