A Method to Improve PLL Performance Under Abnormal Grid Conditions

Ghoshal, Anirban and John, Vinod (2007) A Method to Improve PLL Performance Under Abnormal Grid Conditions. In: National Power Electronics Conference 2007, 17-19 Dec. 2007, Indian Institute of Science , Bangalore.

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Abstract

Phase tracking system or phase locked loop (PLL) is an important part of the control unit of a grid connected power converter. Popular methods such as zero crossing detection (ZCD) and synchronous reference frame (SRF) PLL do not produce accurate phase information when grid is non-ideal. In this work a method to obtain accurate phase information when the grid voltages are unbalanced by adding a moving average filter to a SRF PLL has been proposed. The performances of the PLL have been experimentally verified for abnormal grid conditions such as unbalance, harmonics, voltage sag and swell, faults etc. Generally, during a fault phase voltages become unbalanced so this method can give better fault ride through capability to a power converter.

Item Type:	Conference Paper
Additional Information:	Copyright of this article belongs to Indian Institute of Science.
Keywords:	Phase locked loop (PLL);Utility interface;Grid connected converters;Synchronous reference frame (SRF)
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	07 Feb 2008
Last Modified:	19 Sep 2010 04:42
URI:	http://eprints.iisc.ernet.in/id/eprint/12985

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