Quadrature signal generator based on all-pass filter for single-phase synchronization

Low-cost single-phase grid connected converters require synchronization with the grid voltage to obtain a better response and protection under diverse conditions, such as frequency perturbations and distortion. Phase-locked loops (PLLs) have been used in this scenario. This paper describes a set of quadrature signal generators for single-phase PLLs; compares the performances by means of simulation tests considering diverse operation conditions of the electrical grid; proposes strategies to reduce the computational burden, considering fixed-point digital implementations; and provides both descriptive and quantitative comparisons of the required mathematical operations and memory units for implementation of the analyzed single-phase PLLs.

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“…The first-order all-pass filter (APF) PLLs are easy to implement to create the fictitious orthogonal signal [39,[76][77][78].…”

Section: Pll Based On First-order All-pass Filtersmentioning

confidence: 99%

Evaluation of Quadrature Signal Generation Methods with Reduced Computational Resources for Grid Synchronization of Single-Phase Power Converters through Phase-Locked Loops

2020

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“…However, it is hard to adopt this technique in single phase converters since it requires at least two orthogonal vectors from a single phase quantity. To generate orthogonal vectors, different techniques can be used [18]- [20]. In this study, the most common method is used, in which a time delay block introduces a phase shift of 90° with respect to fundamental frequency of reference signal.…”

Section: Synchronous Reference Frame Based Pi Controllermentioning

confidence: 99%

Analysis and design of single phase voltage-frequency converter with optimized PI controller

Asna¹,

Shareef²,

Khalid³

et al. 2019

IJPEDS

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This paper proposes a new voltage frequency converter (VFC) that converts both voltage and frequency to the required level of voltage and frequency in low voltage networks used in various countries. The proposed converter could be used as a universal power supply for sensitive AC loads. The converter is composed of, input voltage and frequency detection circuitry, full bridge boost rectifier and a DC to AC inverter. In addition, to improve the feasibility and performance of the converter, synchronous reference based PI (SRFPI) controller is adopted, where the system behaves similar to a DC-DC converter. The parameter selection of PI controller is done using a recent optimisation technique called Lightning Search Algorithm (LSA). The simulation of VFC is conducted in MATLAB/Simulink environment. The simulation results shows that LSA based PI controller provides better output voltage regulation with respect to the reference value under various load and input conditions.

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“…An APF is a filter in which allows all frequency signals to pass through not changing their amplitude, changing only their phase. The APF-PLL based on the all-pass filter has gained wide attention because of its simple structure and easy implementation [3]. However, because APF cannot suppress high-frequency harmonic voltages, it cannot accomplish accurate phase locking in applications where grid distortion is severe.…”

Section: Introductionmentioning

confidence: 99%

Improved Single-phase PLL Based on All-Pass Filter

Cao

Feng

2023

J. Phys.: Conf. Ser.

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The detection accuracy of a conventional phase-locked loop for a single phase is affected by the interference of the DC component and harmonic component when the grid has a lot of problems such as harmonic interference and DC offset, and It will be unable to accurately track the grid voltage frequency and phase. The traditional APF-PLL is improved to address this problem. An improved phase-locking algorithm is proposed, combining a CSOGI and a FLL with the conventional single-phase phase-locked loop. The method incorporates CSOGI into the APF-PLL pre-stage to reduce interference from DC and harmonic components, while FLL achieves the frequency tracking of the input signal and improves the adaptivity and dynamic response speed of the phase-locked loop. Through simulation verification, the proposed new phase-locked loop can improve the frequency tracking capability, dynamic performance, and precision of the locking phase of the PLL.

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Quadrature signal generator based on all-pass filter for single-phase synchronization

Cited by 12 publications

References 14 publications

Evaluation of Quadrature Signal Generation Methods with Reduced Computational Resources for Grid Synchronization of Single-Phase Power Converters through Phase-Locked Loops

Evaluation of Quadrature Signal Generation Methods with Reduced Computational Resources for Grid Synchronization of Single-Phase Power Converters through Phase-Locked Loops

Analysis and design of single phase voltage-frequency converter with optimized PI controller

Improved Single-phase PLL Based on All-Pass Filter

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