A Nonadaptive Window-Based PLL for Single-Phase Applications

Golestan, Saeed; Guerrero, Josep M.; Vasquez, Juan C.

doi:10.1109/tpel.2017.2713379

Cited by 35 publications

(26 citation statements)

References 28 publications

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“…MAFs are commonly regarded as "ideal LPFs" because, although they exhibit a first-order linear LPF magnitude envelope, they notch the harmonics of the tuned cut-off frequency ω c . However, interharmonics do not follow such behavior, and variations in frequency-a customary consideration for PLLs design-would take the signal out of the notched areas, demanding MAF's adaptability for guaranteeing harmonics' rejection-such an effect is deeply disclosed in [10]. Moreover, their tuning is dependent on a memory window that must store N ∈ N elements according to NT s = 2π/ω c ; for a small T s , memory allocation becomes inconvenient.…”

Section: Mafs' Backgroundmentioning

confidence: 99%

“…It is a novel approach, as neither MR systems nor sequential HB filtering have been reported in past related literature. Furthermore, the solutions to tackle known MAF issues seem to have moved away from the MAF itself and mostly focus on the PLL external structure or additional processing blocks [3,10,12]. It is shown here that HB-based PLLs exhibit enhanced performance against frequency-related disturbances at the cost of moderate dynamic losses.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the MAF interacts with non-harmonic frequencies, just as a first-order LPF [6], making frequency disturbances particularly harmful for the PLL performance. This problem has been faced by adding a loop to adapt the MAF's cut-off frequency; yet, non-harmonic components cannot be rejected, and sudden frequency variations would compromise the additional loop's performance and stability [10].…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, the usage of multi-rate (MR) systems is proposed in this work as a substitution for the MAF, to cope with the discrete requirements and, more importantly, as a means to tackle frequency-related disturbances from a non-adaptive perspective. It is worth mentioning that enabling non-adaptive MAF PLLs commonly comes with significantly increased complexity and requires an additional frequency estimator [10]-which is redundant and susceptible to frequency disturbances.…”

Section: Introductionmentioning

confidence: 99%

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A Non-Adaptive Single-Phase PLL Based on Discrete Half-Band Filtering to Suppress Severe Frequency Disturbances

2020

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The interconnection of new generating and storing devices to the power grid imposes the necessity of synchronizing, so the power flow can be manipulated and distributed. In the presence of an increasingly perturbed electric grid, many proposals of novel and modified synchronization techniques attained enough robustness to deal with known perturbations. However, such proposals exhibit drawbacks on their own, leaving open enhancement opportunities, mostly over their discrete implementation—e.g., sampling issues and not-considered inter/harmonics—and their inherent complexity—e.g., the need for frequency adaptability. In this work, three traditional synchronous reference frame (SRF) phase-locked loops (PLL) are modified to implement discrete filtering, such as the well-known proposals based on moving average filters (MAFs), to avoid the problems mentioned above, known for affecting the MAF’s performance. This proposal makes use of discrete, efficient units modularly assembled to yield a signal’s average, based on elliptic half-band filters. The proposed PLLs were tested and exhibited clear advantages—robustness against frequency disturbances—over MAF-based equivalents at standardized tests over a typical simulation environment, setting through this work an initial milestone for its verification and further incorporation in more complex synchronization topologies.

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Section: Mafs' Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Non-Adaptive Single-Phase PLL Based on Discrete Half-Band Filtering to Suppress Severe Frequency Disturbances

2020

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“…In the past, several researches have successfully shown that the frequency assessment technology was able to detect the PQs of defects in power system. These technologies include Zero-crossing Algorithm [5][6][7], Discrete Fourier Transform (DFT) [8][9][10][11][12][13], Kalman Filter (KF) [14,15], Phase-Locked Loops (PLL) [16,17], Newton Algorithm [18,19], Least squares Algorithm (LMS) [20,21], Prony Algorithm [4,22], Taylor Algorithm [23,24], and Artificial-intelligence Algorithm [25,26].…”

Section: Introductionmentioning

confidence: 99%

Application of a Hybrid Method for Power System Frequency Estimation with a 0.2-second Sampled Period

Lee

Tsai

2018

MATEC Web Conf.

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The signal processing technique is one of the principal tools for diagnosing power quality (PQ) issues in electrical power systems. The Discrete Fourier Transform (DFT) is a frequency analysis technique used to process power system signals and identify PQ problems. However, the DFT algorithm may lead to spectral leakage and picket-fence effect problems for asynchronously sampled signals that contain harmonic, inter-harmonic, and flicker components. To resolve this shortcoming, a hybrid method for frequency estimation based on a second-level DFT approach and a frequency-domain interpolation algorithm to obtain the accurate fundamental frequency of a power system is proposed in this paper. This method uses a second-level DFT to compute the cosine and sine parts for the fundamental frequency components of the acquired signals. Then, a frequency-domain interpolation approach is adopted to determine the amplitude ratio for the cosine and sine parts of the system’s fundamental frequency. A set of mixed signals with harmonic, inter-harmonic, and flicker components with the fundamental frequency deviation is used. The evaluation results demonstrate the superiority of the new method over other approaches for assessing asynchronously sampled signals contaminated with noise, harmonic, inter-harmonic, and flicker components.

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A novel time delay‐based phase‐locked loop with improved anti‐harmonic interference performance for grid synchronization

Liu

Zhang

et al. 2023

Circuit Theory & Apps

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SummaryThe time delay unit‐based PLLs (TD‐PLLs) are widely used in grid synchronization in single‐phase power systems. However, the TD‐PLL is vulnerable to frequency variations and harmonic disturbances, leading to grid synchronization failures. Analysis shows that the performance degradation is due to the inability to obtain the variation of the input signal frequency. This paper proposes a new time delay‐based phase‐locked loop called immune to double frequency component TD‐PLL (IDFC‐TD‐PLL) based on a feedback structure to accurately capture the variation of input signal frequency, which can improve the dynamic performance and the performance against harmonic interference. Simulations and experiments have evaluated the performance of the proposed phase‐locked loop, demonstrating its superior accuracy and dynamic performance compared to the phase‐locked loops referred in the paper.

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A Nonadaptive Window-Based PLL for Single-Phase Applications

Cited by 35 publications

References 28 publications

A Non-Adaptive Single-Phase PLL Based on Discrete Half-Band Filtering to Suppress Severe Frequency Disturbances

A Non-Adaptive Single-Phase PLL Based on Discrete Half-Band Filtering to Suppress Severe Frequency Disturbances

Application of a Hybrid Method for Power System Frequency Estimation with a 0.2-second Sampled Period

A novel time delay‐based phase‐locked loop with improved anti‐harmonic interference performance for grid synchronization

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