An Enhanced Frequency-Fixed All-Pass Filter PLL for Single-Phase Application

All-pass filter (APF) offers a simpler implementation for orthogonal signal generation (OSG) and has widely featured in single-phase phase locked loop (PLL) applications. However, they have two prominent issues, the absence of filtering capability and reliance on grid frequency information for yield...

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Bibliographic Details
Published in2021 31st Australasian Universities Power Engineering Conference (AUPEC) pp. 1 - 6
Main Authors Gautam, Samir, Lu, Yuezhu, Lu, Dylan Dah-Chuan, Xiao, Weidong, Hasan, Saad Ul
Format Conference Proceeding
LanguageEnglish
Published IEEE 26.09.2021
Subjects
all-pass filter
Band-pass filters
bandpass filter
Filtering algorithms
Harmonic analysis
Heuristic algorithms
Information filters
phase locked loop
Power engineering
Single-phase system
Voltage
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Summary:All-pass filter (APF) offers a simpler implementation for orthogonal signal generation (OSG) and has widely featured in single-phase phase locked loop (PLL) applications. However, they have two prominent issues, the absence of filtering capability and reliance on grid frequency information for yielding 90° phase shifted signal. This paper proposes an enhanced APF-PLL based on frequency fixed configuration for abnormal grid voltage scenarios addressing both the aforementioned concerns. The suggested structure utilizes a modified transformation for attaining frequency-independent APF-PLL, while a frequency-fixed bandpass filter (BPF) is appended as a prefilter to serve the filtering objective. Thus obtained PLL structure, is then evaluated against some recently proposed OSG-PLLs. The simulation and experimental results demonstrate improved performance (dynamic and steady-state) in different operating scenarios.
ISSN:2474-1507
DOI:10.1109/AUPEC52110.2021.9597826