Synchronization algorithms for grid-connected renewable systems: Overview, tests and comparative analysis

Guerrero-Rodríguez, N.F.; Rey-Boué, Alexis B.; Bueno, Emilio; Ortiz, Octavio; Reyes-Archundia, Enrique

doi:10.1016/j.rser.2016.11.038

Cited by 26 publications

(8 citation statements)

References 37 publications

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“…The Synchronous Reference Frame PLL algorithm utilizes mathematical transformations in order to extract the grid angle information. First, a three-phase stationary reference system (1) is transformed into a two-phase stationary reference system using Clarke transform (2), which is then released from constraints and rotates with the grid angle, using Park transform (3) [20].…”

Section: Synchronous Reference Frame (Srf-pll)mentioning

confidence: 99%

Frequency Estimation for Grid-Tied Inverters Using Resonant Frequency Estimator

Zieliński

Fatyga

2021

Energies

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This paper introduces a new strategy of frequency estimation for grid-tied and stand-alone mode AC/DC power converters. Frequency stabilization is required, especially when operating in stand-alone mode with a Droop Control strategy, or in hybrid mode with a Diesel generator. It is also required to reduce or increase power output along with grid frequency changes. The novel strategy utilizes a resonant filter to estimate the frequency of the voltage grid and is referenced as a resonant-frequency-estimator (RFE). A mathematical background is presented for the proposed estimator and its performance is evaluated. It is compared with three common frequency estimation algorithms: SRF-FLL, DDSRF-FLL, and DSOGI-FLL. Results are presented for three cases: frequency swing, harmonics injection, and type B short-circuit. Results are analyzed and the conclusion shows that the proposed novel strategy has comparable parameters to commonly used frequency estimation algorithms while having a loopless structure.

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Section: Synchronous Reference Frame (Srf-pll)mentioning

confidence: 99%

Frequency Estimation for Grid-Tied Inverters Using Resonant Frequency Estimator

Zieliński

Fatyga

2021

Energies

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“…v + g,q = 0 (10) This second part works with samples. Accordingly, Equations ( 11) and ( 12) are the discretized Equations ( 8) and (9).…”

Section: Finite Position Setmentioning

confidence: 99%

“…In order to build orthogonal signals, a dual second order generalized integrator (DSOGI) pre-filter was implemented [7], providing an effective harmonics attenuation that is caused by the negative sequence component due to unbalanced voltages [8]. However, the second-order generalized integrator (SOGI) can degrade its operation due to the presence of harmonics elements and frequency deviations [9]. The work [10] introduces one proposal to fix the cited problems.…”

Section: Introductionmentioning

confidence: 99%

One-Cycle Fourier Finite Position Set PLL

et al. 2021

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This work introduces a new method for computing the angular position of the voltage of the grid—based on a finite set of angles—in the condition of failures in the distribution systems, as symmetrical and asymmetric voltage sags, unbalance, harmonic distortions, and frequency changes. This method is inspired in the model predictive control finite control set principles. In this way, the proposal employs the One-Cycle Fourier filter (OCF) to estimate the positive sequence of the voltage vector into the stationary αβ-frame. The positive sequence voltages extracted from this filter is then handled by an algorithm that is implemented by a finite position set (FPS) for estimating the phase angle. In this way, the minimized cost function chooses the optimal angular position while using the predicted behavior of the grid voltage vector elements in dq frame. The structure, called One-Cycle Fourier Finite position Set Phase Locked Loop (OCF-FS-PLL), here is a composition of the OCF and the FPS. The results that were obtained in an experimental test bench validate the proposed method.

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“…One of the most frequently used synchronization algorithms is the second-order generalized integrator phase-locked loop (SOGI-PLL) due to its simplicity, low computational cost, and independence from network frequency, and because it avoids filtering delays [28][29][30]. In this paper, a modification of the SOGI-PLL architecture is proposed; the modification improves the stability of the quadrature signal generator (QSG) stage and increases the bandwidth of the PLL structure, achieving a fast response of the PLL as a whole, without sacrificing the harmonic rejection capability of the traditional SOGI-PLL.…”

Section: Introductionmentioning

confidence: 99%

A Modified SOGI-PLL with Adjustable Refiltering for Improved Stability and Reduced Response Time

2022

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The controls of most power electronic inverters connected to an electrical power system (EPS) rely on the precise determination of the voltage magnitude, frequency, and phase angle at the point of common coupling. One of the most widely used approaches for measuring these quantities is the phase-locked loop (PLL); however, the precision of this measurement is affected during transients in the EPS and is a function of the type of event and the architecture of the PLL. PLLs based on the second-order generalized integrator (SOGI) are widely used in power converter synchronization, offering an adaptive or fixed-parameter prefilter with low-pass and band-pass characteristics. This article proposes a variant of the SOGI-PLL that offers improved stability and a faster response time. This is accomplished by decoupling the effect of the SOGI’s gains and adding feedback. The modification is carried out in the state space model of the SOGI. Manipulating the attenuation moves the poles of the SOGI to improve the stability. The performance of the proposed PLL is verified and validated under the processor-in-the-loop (PIL) approach.

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Synchronization algorithms for grid-connected renewable systems: Overview, tests and comparative analysis

Cited by 26 publications

References 37 publications

Frequency Estimation for Grid-Tied Inverters Using Resonant Frequency Estimator

Frequency Estimation for Grid-Tied Inverters Using Resonant Frequency Estimator

One-Cycle Fourier Finite Position Set PLL

A Modified SOGI-PLL with Adjustable Refiltering for Improved Stability and Reduced Response Time

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