Frequency-Locked Loop-Based Estimation of Single-Phase Grid Voltage Parameters

Ahmed, Hafiz; Amamra, Sid-Ali; Bierhoff, Michael

doi:10.1109/tie.2018.2873527

Cited by 64 publications

(40 citation statements)

References 21 publications

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“…For this purpose, the proposed adaptive observer (AO) is implemented in Matlab/Simulink using Runge-Kutta discretization technique with a sampling frequency of 10 kHz. As a comparison tool, circular limit cycle oscillator -frequency-locked loop (CLO) [39] and adaptive notch filter (ANF) [14] are selected. Both of the comparison techniques are nonlinear in nature and can handle DC bias.…”

Section: Results and Discussion A Hardware-in-the-loop (Hil) Exmentioning

confidence: 99%

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Coordinate Transformation-Free Observer-Based Adaptive Estimation of Distorted Single-Phase Grid Voltage Signal

et al. 2020

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This paper studies the phase and frequency estimation problem of single-phase grid voltage signal in the presence of DC offset and harmonics. For this purpose, a novel parameterized linear model of the grid voltage signal is considered where the unknown frequency of the grid is considered as the parameter. Based on the developed model, a linear observer (Luenberger type) is proposed. Then using Lyapunov stability theory, an estimator of the unknown grid frequency is developed. In order to deal with the grid harmonics, multiple parallel observers are then proposed. The proposed technique is inspired by other Luenberger observers already proposed in the literature. Those techniques use coordinate transformation that requires real-time matrix inverse calculation. The proposed technique avoids real-time matrix inversion by using a novel state-space model of the grid voltage signal. In comparison to similar other techniques available in the literature, no coordinate transformation is required. This significantly reduces the computational complexity w.r.t. similar other techniques. Comparative experimental results are provided with respect to two other recently proposed nonlinear techniques to show the dynamic performance improvement. Experimental results demonstrate the suitability of the proposed technique.

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Section: Results and Discussion A Hardware-in-the-loop (Hil) Exmentioning

confidence: 99%

“…As such lower values are recommended. Parameters of the comparative techniques are selected according to the guidelines in the original papers where the methods were proposed [14], [39].…”

Section: Results and Discussion A Hardware-in-the-loop (Hil) Exmentioning

confidence: 99%

Coordinate Transformation-Free Observer-Based Adaptive Estimation of Distorted Single-Phase Grid Voltage Signal

et al. 2020

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“…However, this require accurate information of the grid voltage parameters. Grid voltage parameters are an integral part of the GCC controller [2]- [9]. This motivates the current work.…”

Section: Introductionmentioning

confidence: 85%

Enhanced Frequency Adaptive Demodulation Technique for Grid-Connected Converters

Ahmed

Biricik

Benbouzid

2021

IEEE Trans. Ind. Electron.

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This paper presents an enhanced frequency adaptive demodulation technique for grid-synchronization of grid-connected converters (GCC) in variable frequency condition. Demodulation works by generating demodulated voltages which contain undesired double frequency components. As a result, high-order low-pass filters (LPF) with high cutoff frequency are required to eliminate the undesired components. This reduces the dynamic performance. Frequency adaptive demodulation technique enhances the dynamic performance by rejecting the double frequency components as opposed to filtering, however, at the cost of additional computational complexity. This paper overcomes this problem by using double demodulation without recreating the double frequency component for rejection purpose. This reduces the computational complexity significantly. Suitability of proposed method is verified through numerical simulation and experimental study. Comparative study with existing frequency adaptive demodulation and second-order generalized integrator phase-locked loop (SOGI-PLL) techniques demonstrate the validity and performance improvement by the proposed technique.

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“…In addition, there are other aspects of design choices in the FLL design. For instance, both (13) and (13) are able to achieve the goal of FAL. It is necessary to take as many design choices as possible into account, in order to further improve existing FLLs for advantageous performance.…”

Section: Proposed Generalized Design Frameworkmentioning

confidence: 99%

“…In contrast to PLLs, FLLs usually use the estimated frequency as a feedback variable. Growing interest has been directed to FLLs as another breed of grid synchronization techniques, which include notch filter-based FLL [6]- [11], limit cycle oscillator-based FLL [12], [13], linear Kalman filter-based FLL [14], consecutive sample-based FLL [15], moving window filter-based FLL [16], moving-window discrete Fourier transform-based FLL [17], etc. Since notch filter-based FLL possesses low complexity and good harmonic suppression capability [6], [7], it has attracted increasing attention.…”

Section: Introductionmentioning

confidence: 99%

Reinvestigation of Single-Phase FLLs

Geng

Yang

2019

IEEE Access

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Besides well-known phase-locked loops, frequency-locked loops (FLLs) are applicable to grid synchronization for grid-tied power converters. The models, principles, and algorithm structures of existing notch filter-based single-phase FLLs are often described with different theories in previous studies. Consequently, a theoretically unified understanding and further advancements of such type of FLLs are restricted. This paper reinvestigates notch filter-based single-phase FLLs and develops a generalized design framework for such types of FLLs. The model derivations of the FLLs are made uniformly via the Popov's model reference adaptive control theory, in order to achieve the theoretically unified understanding. Three major contributions are received in this paper. First, a family of FLLs is derived, and existing seemingly different FLL designs are accordingly developed into a family of homologous FLLs. Second, the performance differences between the FLLs in the whole family are evaluated and compared quantitatively from the algorithm structure point of view, in terms of stability, convergence speed, and harmonic suppression capability. Finally, an enhanced single-phase FLL (named the 1φ-EFLL) is recommended by the family of the homologous FLLs. The designs and the performance evaluations are verified by both simulations and experiments. INDEX TERMS Frequency-locked loop (FLL), grid synchronization, model reference adaptive control (MRAC), phase-locked loop (PLL), power converter control, second-order generalized integrator (SOGI).

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Frequency-Locked Loop-Based Estimation of Single-Phase Grid Voltage Parameters

Cited by 64 publications

References 21 publications

Coordinate Transformation-Free Observer-Based Adaptive Estimation of Distorted Single-Phase Grid Voltage Signal

Coordinate Transformation-Free Observer-Based Adaptive Estimation of Distorted Single-Phase Grid Voltage Signal

Enhanced Frequency Adaptive Demodulation Technique for Grid-Connected Converters

Reinvestigation of Single-Phase FLLs

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