Decoupled DSOGI-PLL for Improved Three Phase Grid Synchronisation

Nazib, A, Holmes, G and McGrath, B 2018, 'Decoupled DSOGI-PLL for Improved Three Phase Grid Synchronisation', in Proceedings of the 2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia), Niigata, Japan, 20-24 May 2018, pp. 3670-3677.


Document type: Conference Paper
Collection: Conference Papers

Title Decoupled DSOGI-PLL for Improved Three Phase Grid Synchronisation
Author(s) Nazib, A
Holmes, G
McGrath, B
Year 2018
Conference name IPEC-Niigata 2018 -ECCE Asia
Conference location Niigata, Japan
Conference dates 20-24 May 2018
Proceedings title Proceedings of the 2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia)
Publisher IEEE
Place of publication United States
Start page 3670
End page 3677
Total pages 8
Abstract The DSOGI-PLL structure is widely used for grid synchronization in three phase systems because of its capability to reject voltage harmonics and rapidly calculate the positive sequence fundamental voltage under unbalanced grid conditions. However, its conventional design requires the estimated supply frequency from the PLL to be fed back to the SOGI structure to make it frequency adaptive. This creates an interdependent loop that reduces stability margins and limits the PLL bandwidth. To reduce this interaction, this paper presents an alternative approach that improves the stability margin of the overall system and so allows the PLL bandwidth to be increased without degrading the SOGI harmonic rejection capability. Detailed simulation and experimental results are presented to validate the proposed approach.
Subjects Power and Energy Systems Engineering (excl. Renewable Power)
Keyword(s) Grid synchronization
second order generalised integrator (SOGI)
phase-locked loop (PLL)
grid connected converter
DOI - identifier 10.23919/IPEC.2018.8507364
Copyright notice Copyright © 2018, IEEJ Industry Applications Society
ISBN 9781538641903
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