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Single phase NTD PLL for fast dynamic response and operational robustness under abnormal grid condition
journal contribution
posted on 2023-05-21, 06:23 authored by Gautam, S, Lu, Y, Waqas HassanWaqas Hassan, Xiao, W, Lu, DD-CNon-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.
History
Publication title
Electric Power Systems ResearchVolume
180Article number
106156Number
106156Pagination
1-10ISSN
0378-7796Department/School
School of EngineeringPublisher
Elsevier Science SaPlace of publication
Po Box 564, Lausanne, Switzerland, 1001Rights statement
© 2019 Elsevier B.V. All rights reserved.Repository Status
- Restricted