PROJECT TITLE :

Modeling and Design of Islanding Detection Using Phase-Locked Loops in ThreePhase Grid-Interface Power Converters (2014)

ABSTRACT :

Islanding detection is critical to safety and power quality as well as the control mode of grid-interface power converters. This paper addresses the islanding-detection methods on the basis of the grid synchronization instability mechanism. Although many modified phase-locked loop (PLL) methods have been proposed to achieve islanding detection, the PLL modeling and design are not clear in the existing literature and a cut-and-trail process is usually required during the design phase. This paper proposes a systematic PLL modeling and design approach to evaluate different frequency-based islanding-detection methods. Two different types of PLL-based islanding-detection solution are discussed, accounting for a majority of the existing methods. The first method is to modify the PLL to constantly move the stable equilibrium point. The second method is to modify the PLL small-signal characteristics to achieve a monotonic instability behavior under the islanded conditions. The design procedures of these methods are presented using the proposed PLL modeling approach. The impact of the modified PLLs to the converter's operation is also analyzed.


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