A Simple Frequency Estimator for Power Systems

Ahmed, Hafiz; Ushirobira, Rosane; Efimov, Denis

doi:10.1109/tim.2021.3094249

Cited by 10 publications

(3 citation statements)

References 9 publications

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“…In the conventional DSC-based DC offset rejection approach, half-cycle delayed signals are used. Recently, in [ 31 , 38 , 39 ], an alternative approach has been presented where DC offset rejection can be done using an arbitrary length of delay. As such, the modified DSC approach is adopted in this work.…”

Section: Development Of the Proposed Pllmentioning

confidence: 99%

Fundamental frequency sequence amplitude estimator for power and energy applications

Ahmed

Tir²,

Biricik

et al. 2022

PLoS ONE

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A grid-synchronization-based fundamental frequency positive-sequence (FFPS) and negative-sequence (FFNS) amplitudes estimation technique is proposed for unbalanced and distorted grid. In this technique, the sequence amplitudes are extracted by extracting the phase-angle of the FFPS and FFNS components. The extracted phase-angles have DC and double frequency AC components. The AC component is filtered out by using a Moving Average Filter (MAF) of appropriate window length. From the extracted phase-angle, the unknown frequency can be estimated by using a suitable controller. A frequency-fixed equidistant samples-based pre-loop filter is also applied to eliminate the effect of measurement offset. The proposed technique has a very simple structure and is easy to tune. Small-signal modeling-based stability analysis and gain tuning procedure are also provided. The proposed technique strikes a good balance between fast convergence and disturbance rejection capability. Comparative numerical simulation and experimental results with similar other techniques demonstrate the suitability and performance enhancement by the proposed technique.

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Section: Development Of the Proposed Pllmentioning

confidence: 99%

Fundamental frequency sequence amplitude estimator for power and energy applications

Ahmed

Tir²,

Biricik

et al. 2022

PLoS ONE

Self Cite

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“…However, its performance deteriorates when sudden changes take place in the grid voltage. Since the frequency estimator alone can handle a selective order of harmonics, the four equidistant sample (4ES)-based technique is gaining popularity in the technical literature [40]. Note that an additional prefiltering stage is always required to assist the sample-based frequency estimator in achieving better robustness under heavily distorted grid conditions [41].…”

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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“…In the realm of frequency measurement techniques, several innovative approaches have been introduced. The work cited as [17] presents a straightforward method grounded in a delay-based linear-regression framework. Comparative analysis with TQT1-PLL demonstrates that the proposed technique is twice as fast as the existing method, showcasing its efficiency and speed.…”

Section: Introductionmentioning

confidence: 99%

Generator Protection Based on Fast Frequency and Phase Measurement

Adapa,

Wang

2024

Advances in Transdisciplinary Engineering

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The existing generator protection systems employ complex algorithms that require substantial memory and substantial computing power. To overcome these challenges, this paper presents an efficient, reliable, and computationally less intensive generator protection method focused on swiftly measuring generator frequency and phase. This approach has been assessed within a system comprising a synchronous generator powering a DC load. The paper provides a detailed model of the synchronous generator and evaluates the influence of a rectifier, comparing it with a PLL-based Phasor Measurement Unit (PMU).

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A Simple Frequency Estimator for Power Systems

Cited by 10 publications

References 9 publications

Fundamental frequency sequence amplitude estimator for power and energy applications

Fundamental frequency sequence amplitude estimator for power and energy applications

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

Generator Protection Based on Fast Frequency and Phase Measurement

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