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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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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
Publisher: Indian Institute of Science
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.ac.in/id/eprint/12985

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