An Improved Delayed Signal Cancelation for Three-Phase Grid Synchronization with DC Offset Immunity

Smadi, Issam A.; Atawi, Ibrahem E.; Ibrahim, Ammar A.

doi:10.3390/en16062873

Cited by 4 publications

(6 citation statements)

References 23 publications

(45 reference statements)

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“…The presence of dc offset, harmonics, and the fundamental frequency negative sequence (FFNS) component in the grid voltage results in an error in the estimation of grid frequency using (1). Therefore, the αβ-axis voltage components should be filtered out before using them in the calculation of grid frequency.…”

Section: Filtering Of the Grid Voltage Disturbance Componentsmentioning

confidence: 99%

“…Providing an accurate estimation of the grid voltage phase, frequency, and amplitude is extremely important in a wide variety of applications, including distributed generation (DG) systems and microgrids, high-voltage direct current systems, flexible alternating current transmission systems, and power conditioning systems, and in the monitoring and protection of power systems [1][2][3][4][5]. For instance, in DG systems and microgrids, knowledge of the grid phase, frequency, and amplitude is required for a seamless transition from islanding mode to grid-connected mode, as well as for islanding detection [6].…”

Section: Introductionmentioning

confidence: 99%

“…One of the earliest methods was the zero-crossing detection (ZCD)-based technique [8,9]. However, while the ZCD approach is easy to implement, it suffers from two main drawbacks: (1) it often has a poor dynamic response, as the algorithm is updated only every half cycle [10,11]; and (2) its performance deteriorates in the presence of noise, harmonics, and commutation notches, as these disturbances result in multiple zero crossings. Several approaches to improve the performance of the ZCD-based method can be found in later studies [12,13].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Frequency/Phase/Amplitude Estimator for Three-Phase Applications Operating at a Low Sampling Rate

Abusorrah,

Sepahvand

2024

Mathematics

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A frequency/phase/amplitude estimator is arguably one of the most crucial components in the control and synchronization of grid-connected equipment. Such an estimator may also be useful for monitoring and protection purposes in power systems. In this paper, an open-loop (and therefore unconditionally stable) estimator for the accurate and rapid extraction of the grid voltage phase, frequency, and amplitude is presented. In designing the proposed technique, special focus is given to applications operating at a low sampling rate. Examples of such applications include high-power converters, where both switching and sampling frequencies are very low. The study concludes with a comprehensive evaluation of the proposed estimator, demonstrating its effectiveness in accurately and swiftly estimating the fundamental parameters of grid voltage under low sampling rates. It highlights the estimator’s enhanced performance in scenarios of distorted grid conditions and its superiority in filtering capabilities compared to traditional methods. These findings underline the estimator’s potential for broad applicability in power system monitoring, protection, and control.

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Section: Filtering Of the Grid Voltage Disturbance Componentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Frequency/Phase/Amplitude Estimator for Three-Phase Applications Operating at a Low Sampling Rate

Abusorrah,

Sepahvand

2024

Mathematics

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“…The DC offset in the grid voltage can result from different sources, such as grid faults, geomagnetic phenomena, A/D conversion, the offset of voltage sensors, sampling, measurement errors, the DC injection by the distributed system, and implementation of control algorithms in microcontrollers [11][12][13][14][15][16][17]. The presence of the DC offset resulted in a fundamental frequency oscillation in the estimated grid parameters, affecting the closedloop stability, power quality, and operation of the grid-connected converter.…”

Section: Introductionmentioning

confidence: 99%

Advanced Single-Phase PLL-Based Transfer Delay Operators: A Comprehensive Review and Optimal Loop Filter Design

Bany Fawaz,

Smadi,

Albatran

et al. 2024

Energies

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In recent years, several research works have addressed and developed the phase-locked loop (PLL) in single-phase grid-connected converters with different structures and properties. Each has merits and demerits, such as a complex structure, high computational burden, and slow transient response. This paper aims to comprehensively review advanced single-phase PLLs based on transport delay operators to realize signal orthogonality. A deep insight into the PLLs’ small-signal modeling, main characteristics, stability analysis, and loop filter design are provided in this paper. The main advantages and drawbacks are explained for each type of PLL in terms of different performance indexes, such as settling time, estimation error, and ripples in the estimated grid information. This paper also aims to provide optimal tuning and design of the loop filter gains from the large-signal model point of view, including all the nonlinearities, adopting the stochastic optimization method. All simulations are implemented using the MATLAB/Simulink 2018b environment to validate all theoretical analyses of this paper. The sampling and nominal frequencies are set to be 100 kHz and 50 Hz throughout all the simulation studies.

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“…In ref. [21], the authors proposed applying the Modified Delayed Signal Cancelation (MDSC) operator in the dq reference frame to reject the DC-offset effect, regardless of the delay factor selection.…”

Section: Introductionmentioning

confidence: 99%

Grid-Connected Renewable Energy Sources: A New Approach for Phase-Locked Loop with DC-Offset Removal

Bany Issa,

Al Muala,

Bello Bugallo

2023

Sustainability

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Renewable Energy Sources (RES) are widely used worldwide due to their positive effect on the environment, being sustainable, low cost, and controllable. The power generated from RESs must be configured to interface and perfectly synchronize with the grid by using Power Electronics Converters (PEC). A Phase-Locked Loop (PLL) is one of the most popular synchronization techniques used due to its speed and robustness. A growing issue that results in oscillations in the estimated fundamental grid phase, frequency, and voltage amplitude is the DC-offset in the input of the PLL. This study was developed to eliminate the DC-offset in the single-phase grid synchronization using Delay Signal Cancellation (DSC) and a fixed-length Transfer Delay (TD)-based PLL. Then, the small-signal model, stability analysis, and selection of controller gains were discussed. The proposed PLL was simulated using MATLAB/Simulink. Moreover, to evaluate the proposed method, several scenarios were developed in order to compare it with other powerful PLLs in terms of performance indicators such as settling time, frequency, and phase error. As a result, the proposed PLL has the fastest dynamic response, completely rejects the DC-offset effect, and fully synchronizes with the electrical grid.

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An Improved Delayed Signal Cancelation for Three-Phase Grid Synchronization with DC Offset Immunity

Cited by 4 publications

References 23 publications

A Frequency/Phase/Amplitude Estimator for Three-Phase Applications Operating at a Low Sampling Rate

A Frequency/Phase/Amplitude Estimator for Three-Phase Applications Operating at a Low Sampling Rate

Advanced Single-Phase PLL-Based Transfer Delay Operators: A Comprehensive Review and Optimal Loop Filter Design

Grid-Connected Renewable Energy Sources: A New Approach for Phase-Locked Loop with DC-Offset Removal

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