An αβ-Frame Moving Average Filter to Improve the Dynamic Performance of Phase-Locked Loop

Li, Jinbo; Wang, Qin; Xiao, Lan; Hu, Yinfeng; Wu, Qunfang; Liu, Zehao

doi:10.1109/access.2020.3028237

Cited by 18 publications

(9 citation statements)

References 45 publications

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“…After Park transformation, the fundamental positive-sequence, DC offset, fundamental negative-sequence, and n th -order harmonics in the abc frame are respectively transformed into the DC offset, negative-sequence, negative 2 nd -order, and (n−1) th -order harmonics in the dq frame [35]. The transformation of harmonic orders from the abc to the dq frame is summarized in Table I [6], [8].…”

Section: Methodsmentioning

confidence: 99%

“…However, applying MAF introduces a considerable phase delay in the PLL control loop leading to slower dynamic response and reduced bandwidth. To deal with this challenge, several approaches such as pre-loop MAFs [7], [8], Quasi-Type-1 (QT1) PLL structure [28], hybrid PLL structure [29], PID controller [30], and lead compensator [31] have been proposed in the literature.…”

Section: Lcl Filtermentioning

confidence: 99%

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Improving Performance of Three-Phase MAF-PLL Under Asymmetrical DC-Offset Condition

Taheri,

Amini,

Moallem

2023

IEEE Access

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Synchronization is a critical aspect of integrating renewable energy sources and inverter-based power plants into the electrical grid. Phase-Locked Loops (PLLs) are widely used for this purpose, providing rapid and accurate phase and frequency estimation. In PLLs, the Moving Average Filter (MAF) is commonly employed to extract the fundamental grid voltage component, particularly in the presence of harmonic distortions. Traditional PLLs with a full-cycle time-window MAF perform well in grids with sinusoidal voltage waveforms and DC offsets. However, this approach sacrifices the speed of dynamic response due to the extended time window. In this paper, we introduce a novel approach to address this trade-off. Our method involves reducing the MAF's time window to one cycle by incorporating a delay operator, effectively reducing model complexity and runtime by 50%. Through comprehensive simulations and experimental scenarios, we demonstrate the practical advantages of the proposed method. Comparison of the proposed approach is provided with existing algorithms in the literature, which illustrate its effectiveness in terms of mitigating PLL oscillations in the presence of DC offsets and other non-ideal grid conditions while achieving a 50% improvement in the execution speed. Therefore, the contribution of this paper is in the field of grid synchronization by providing a balanced solution that enhances dynamic response without compromising DC-offset rejection. The proposed method can improve the stability and efficiency of grid-connected systems involving renewable energy sources and inverter-based power plants.

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Section: Methodsmentioning

confidence: 99%

Section: Lcl Filtermentioning

confidence: 99%

Improving Performance of Three-Phase MAF-PLL Under Asymmetrical DC-Offset Condition

Taheri,

Amini,

Moallem

2023

IEEE Access

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“…Multiple DSC (MDSC) [24], another class of non-ISC filters, has been reported in the literature to address the discretization issue. It works well enough in nominal frequency cases, however, its effectiveness degrades under off-nominal frequency cases.The digital signal processing (DSP)-based BPFs [25] and αβ-framed MAF [26] have shown significant performance in extracting the FFPS from distorted and imbalanced three-phase grid conditions. However, their performance deteriorates when the grid operates under offnominal frequency conditions, where 'K' becomes noninteger (if f s = Kf o ', where f s ' is the sampling frequency, f o ' is the nominal frequency, and 'K' is the number of samples in a fundamental time period) [28].…”

Section: Introductionmentioning

confidence: 99%

Robust Band-Pass Filter-Based PLL-Less Approach for Three-Phase Nonsinusoidal Grid Conditions

Kumar,

Verma,

Burgos-Mellado

et al. 2024

IEEE Open J. Instrum. Meas.

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The performance enhancement of an inverter-based grid-connected system necessitates a fast and accurate dynamic response in terms of estimating three-phase grid voltage attributes. The synchronous reference frame phase-locked loop and/or the frequency-locking (i.e., frequency-locked loop) approaches are widely used in practical applications. However, due to the phase/frequency feedback loops, the aforementioned parameter estimation schemes may experience instability and provide a slow dynamic response. This work presents a PLL-less grid synchronization solution for three-phase applications to counter the slower dynamic response and demonstrate better immunity against the non-ideality of a threephase grid. In order to remove even and odd-order harmonics and extract the fundamental frequency positive sequence (FFPS), the proposed method employs a combination of band pass filters (CBPF). Additionally, a novel frequency estimation algorithm is developed, which accurately estimates the angular three-phase grid frequency. Furthermore, the phase angle and amplitude are adaptively estimated using an off-line error-resolving approach, which is derived from the transfer function of the proposed pre-filtering solution. Finally, the experimental findings validate the robustness of the current proposal.

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“…This method seems to be simpler to practically implement since the DC offset and the scaling error in measured voltages do not need to be detected or estimated. Several converter control techniques are used to estimate positive and negative fundamental components from unbiased and unbalanced three-phase signals based on phase-locked loop implementation [25][26][27][28][29][30]. However, there are challenges facing the design of PLL, such as instability problems [31][32][33][34], complexity in the case of abnormal grid conditions [35], and a large calculation burden [36].…”

Section: Introductionmentioning

confidence: 99%

Modified Extended Complex Kalman Filter for DC Offset and Distortion Rejection in Grid-Tie Transformerless Converters

et al. 2023

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Proper operation of the grid-tie transformerless converters under unbalanced and distorted conditions entails a precise detection of the frequency and fundamental component of the grid voltage. One of the main problems that could arise during the estimation of grid parameters is the existence of a DC offset generated from measurement and A/D conversion. This undesirable induced DC offset could appear as a part of the reference sinusoidal current of grid-tie converters. Although literature has proposed the use of an extended complex Kalman filter (ECKF) for the estimation of positive and negative sequence voltage components as a promising competitor to phase locked loops, mitigating the effect of possible DC offsets when a Kalman filter is employed remains scarce. This paper proposes a new extended complex Kalman filter to improve the filter stability for estimating the frequency and the fundamental positive and negative symmetrical components of the grid voltages, where DC offset, scaling error, and noise can successfully be rejected. The theoretical findings are experimentally validated.

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An αβ-Frame Moving Average Filter to Improve the Dynamic Performance of Phase-Locked Loop

Cited by 18 publications

References 45 publications

Improving Performance of Three-Phase MAF-PLL Under Asymmetrical DC-Offset Condition

Improving Performance of Three-Phase MAF-PLL Under Asymmetrical DC-Offset Condition

Robust Band-Pass Filter-Based PLL-Less Approach for Three-Phase Nonsinusoidal Grid Conditions

Modified Extended Complex Kalman Filter for DC Offset and Distortion Rejection in Grid-Tie Transformerless Converters

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