DESIGN OF ISLANDING DETECTION USING PHASE-LOCKED LOOPS IN THREE-PHASE GRID-INTERFACE POWER

DESIGN OF ISLANDING DETECTION USING PHASE-LOCKED LOOPS IN THREE-PHASE GRID-INTERFACE POWER
Author(s):
M. MadhuSudhan Reddy, E.Arunakumari
Keywords:
Converter stability, distributed generation (DG), islanding detection, phase-locked loop (PLL).
Abstract
Phase locked loop and synchronization techniques are one of the most important issues for operating grid-interfaced converters in practical applications, which involve Distributed Power Generation Systems, Flexible AC Transmission Systems (FACTS), and High Voltage Direct Current (HVDC) Transmission, and so on.This paper proposes a systematic PLL modeling anddesign approach to evaluate different frequency-based islandingdetection methods. Two different types of PLL-based islandingdetection solution are discussed, accounting for a majority ofthe existing methods. The first method is to modify the PLL toconstantly move the stable equilibrium point. The second methodis to modify the PLL small-signal characteristics to achieve amonotonic instability behavior under the islanded conditions.The design procedures of these methods are presented using theproposed PLL modeling approach.
Article Details
Unique Paper ID: 142580 Publication Volume & Issue: Volume 2, Issue 4 Page(s): 121 - 126
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