Advanced SOGI-FLL Scheme Based on Fuzzy Logic for Single-Phase Grid-Connected Converters

Park, Jin-Sang; Nguyễn, Thanh Hải; Lee, Dong-Choon

doi:10.6113/jpe.2014.14.3.598

Cited by 32 publications

(12 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The orthogonal signal set after Park's transformation features the same expression as that in (3). Therefore, the magnitude and phase of the single-phase signal in (8) can be calculated with (4) and (5) instantaneously.…”

Section: B Opl-srf Scheme For a Single-phase Ideal Gridmentioning

confidence: 99%

A Novel Fast Open-loop Phase Locking Scheme Based on Synchronous Reference Frame for Three-phase Non-ideal Power Grids

Xiong¹,

Zhuo²,

Wang³

et al. 2016

Journal of Power Electronics

View full text Add to dashboard Cite

Rapid and accurate phase synchronization is critical for the reliable control of grid-tied inverters. However, the commonly used software phase-locked loop methods do not always satisfy the need for high-speed and accurate phase synchronization under severe grid imbalance conditions. To address this problem, this study develops a novel open-loop phase locking scheme based on a synchronous reference frame. The proposed scheme is characterized by remarkable response speed, high accuracy, and easy implementation. It comprises three functional cascaded blocks: fast orthogonal signal generation block, fast fundamental-frequency positive sequence component construction block, and fast phase calculation block. The developed virtual orthogonal signal generation method in the first block, which is characterized by noise immunity and high accuracy, can effectively avoid approximation errors and noise amplification in a wide range of sampling frequencies. In the second block, which is the foundation for achieving fast phase synchronization within 3 ms, the fundamental-frequency positive sequence components of unsymmetrical grid voltages can be achieved with the developed orthogonal signal construction strategy and the symmetrical component method. The real-time grid phase can be consequently obtained in the third block, which is free from self-tuning closed-loop control and thus improves the dynamic performance of the proposed scheme. The proposed scheme is adaptive to severe unsymmetrical grid voltages with sudden changes in magnitude, phase, and/or frequency. Moreover, this scheme is able to eliminate phase errors induced by harmonics and random noise. The validity and utility of the proposed scheme are verified by the experimental results.

show abstract

Section: B Opl-srf Scheme For a Single-phase Ideal Gridmentioning

confidence: 99%

A Novel Fast Open-loop Phase Locking Scheme Based on Synchronous Reference Frame for Three-phase Non-ideal Power Grids

Xiong¹,

Zhuo²,

Wang³

et al. 2016

Journal of Power Electronics

View full text Add to dashboard Cite

show abstract

“…The behavior of the SOGI-FLL is well studied in the literature. In [7][8][9], the SOGI-FLL was presented as the coupling between its two main parts, the SOGI and the FLL, whose dynamics correspond to that of a second-order system. However, the behavior of the SOGI-FLL is deeply perturbed by voltage sags, which produce high distortion peaks in the FLL response [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

New SOGI-FLL Grid Frequency Monitoring with a Finite State Machine Approach for Better Response in the Face of Voltage Sag and Swell Faults

et al. 2020

View full text Add to dashboard Cite

The SOGI-FLL (Second-Order Generalized Integrator–Frequency-Locked Loop) is a well-known and simple adaptive filter that allows for estimating the parameters of grid voltage with a small computational burden. However, the SOGI-FLL has been shown to be especially sensitive to voltage sags and voltage swells, which deeply distort the estimated parameters, especially the frequency. This problem can be alleviated by simply using a saturation block at the Frequency-Locked Loop (FLL) output to limit the impact of distortion on the estimated frequency. Improving upon this straightforward approach, in this paper we propose the use of a finite state machine (FSM) for the definition of the different states of the SOGI-FLL frequency response during a voltage sag or swell fault. The FSM approach allows for applying different gains during the fault, enhancing the SOGI-FLL transient response. The performance of the FSM-based SOGI-FLL is evaluated by using simulation results, which show a better and faster response to these kinds of faults.

show abstract

“…However, the resonant frequency of the HFR will vary when the compensation degree changes, thus the adaptive frequency detection [16, 17] has to be concluded in the damping control. Usually, it is achieved by a frequency locked‐loop which is based on an adaptive notch filter [18–21]. Unfortunately, the authors of [14, 15] indicate that the performance of the HFR damping controller will degrade due to the dynamic time delay of the resonance frequency detection [18, 19].…”

Section: Introductionmentioning

confidence: 99%

Damping control of high‐frequency resonance based on voltage feedforward for voltage source converter under a parallel compensated grid

Pang

Nian

et al. 2020

IET power electron.

View full text Add to dashboard Cite

Advanced SOGI-FLL Scheme Based on Fuzzy Logic for Single-Phase Grid-Connected Converters

Cited by 32 publications

References 23 publications

A Novel Fast Open-loop Phase Locking Scheme Based on Synchronous Reference Frame for Three-phase Non-ideal Power Grids

A Novel Fast Open-loop Phase Locking Scheme Based on Synchronous Reference Frame for Three-phase Non-ideal Power Grids

New SOGI-FLL Grid Frequency Monitoring with a Finite State Machine Approach for Better Response in the Face of Voltage Sag and Swell Faults

Damping control of high‐frequency resonance based on voltage feedforward for voltage source converter under a parallel compensated grid

Contact Info

Product

Resources

About