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Single phase NTD PLL for fast dynamic response and operational robustness under abnormal grid condition


Gautam, S and Lu, Y and Hassan, W and Xiao, W and Lu, DD-C, Single phase NTD PLL for fast dynamic response and operational robustness under abnormal grid condition, Electric Power Systems Research, 180 Article 106156. ISSN 0378-7796 (2020) [Refereed Article]

Copyright Statement

2019 Elsevier B.V. All rights reserved.

DOI: doi:10.1016/j.epsr.2019.106156


Non-frequency-dependent transfer delay (NTD) approach is one of the simplest and the fastest solution for single-phase AC systems to achieve phase-locked loops (PLLs). It also exhibits immunity to error in estimated quantities in grid frequency variations. However it is susceptible to grid voltage disturbances, such as DC offset and distortions. This paper proposed an improved NTD scheme to achieve both fast dynamic response and operational robustness against abnormal grid conditions. The solution is based on a digital phase lead compensator (PLC), which is cascaded with the MAF inside the PLL control loop to enhance dynamic response and mitigate disturbance, DC offset, and harmonics. The filtering structure is also designed to be adaptive to grid frequency variations. The effectiveness of the proposed solution is verified via simulation and experimental results.

Item Details

Item Type:Refereed Article
Keywords:phase locked loop, moving average filter, grid connected power system
Research Division:Engineering
Research Group:Communications engineering
Research Field:Signal processing
Objective Division:Energy
Objective Group:Energy storage, distribution and supply
Objective Field:Energy services and utilities
UTAS Author:Hassan, W (Dr Waqas Hassan)
ID Code:149220
Year Published:2020
Web of Science® Times Cited:9
Deposited By:Engineering
Deposited On:2022-03-17
Last Modified:2022-04-20

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