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

fYear

2012

fDate

9-12 Oct. 2012

Firstpage

1480

Lastpage

1484

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicle Power and Propulsion Conference (VPPC), 2012 IEEE

Conference_Location

Seoul

Print_ISBN

978-1-4673-0953-0

Type

conf

DOI

10.1109/VPPC.2012.6422589

Filename

6422589