Advanced Grid Synchronization System for Power Converters under Unbalanced and Distorted Operating Conditions

Rodriguez, P.; Luna, Álvaro; Ciobotaru, Mihai; Teodorescu, Remus; Blaabjerg, Frede

doi:10.1109/iecon.2006.347807

Cited by 368 publications

(265 citation statements)

References 10 publications

Supporting

Mentioning

254

Contrasting

Unclassified

Order By: Relevance

“…The 2nd-order harmonic in the positive sequence component caused by the negative sequence component can be eliminated by cross decoupling. The decoupling network can eliminate harmonics from both the positive and negative sequence components [18]. Compared with the SRF-PLL, the DDSRF-PLL does not have to reduce the bandwidth in order to eliminate the influence of negative sequence components.…”

Section: A Decoupled Double Synchronous Reference Frame Pllmentioning

confidence: 99%

Performance Analysis of Three-Phase Phase-Locked Loops for Distorted and Unbalanced Grids

Li¹,

An²,

Zheng³

et al. 2017

Journal of Power Electronics

View full text Add to dashboard Cite

This paper studies the performances of five typical Phase-locked Loops (PLLs) for distorted and unbalanced grid, which are the Decoupled Double Synchronous Reference Frame PLL (DDSRF-PLL), Double Second-Order Generalized Integrator PLL (DSOGI-PLL), Double Second-Order Generalized Integrator Frequency-Lock Loop (DSOGI-FLL), Double Inverse Park Transformation PLL (DIPT-PLL) and Complex Coefficient Filter based PLL (CCF-PLL). Firstly, the principles of each method are meticulously analyzed and their unified small-signal models are proposed to reveal their interior relations and design control parameters. Then the performances are compared by simulations and experiments to investigate their dynamic and steady-state performances under the conditions of a grid voltage with a negative sequence component, a voltage drop and a frequency step. Finally, the merits and drawbacks of each PLL are given. The compared results provide a guide for the application of current control, low voltage ride through (LVRT), and unintentional islanding detection.

show abstract

Section: A Decoupled Double Synchronous Reference Frame Pllmentioning

confidence: 99%

Performance Analysis of Three-Phase Phase-Locked Loops for Distorted and Unbalanced Grids

Li¹,

An²,

Zheng³

et al. 2017

Journal of Power Electronics

View full text Add to dashboard Cite

show abstract

“…4 illustrates the DSOGI-FLL structure. Further details about DSOGI-FLL can be obtained from [7], [8]. Performance comparison between SRF-PLL and DSOGI-FLL will be presented through the simulation.…”

Section: B Dsogi-fll Synchronizationmentioning

confidence: 99%

“…Dual Second Order Generalized Integrator, DSOGI based Frequency Locked Loop, DSOGI-FLL is an insensitive frequency-adaptive synchronization mechanism which benefits the instantaneous symmetrical component analysis considering adaptive filters [7]. Being frequency-based, DSOGI-FLL can efficiently ride-through the grid perturbations, provides a clean synchronization signal and attenuates grid voltage high-frequency components [8]. Fig.…”

Section: B Dsogi-fll Synchronizationmentioning

confidence: 99%

Improved FRT control scheme for DFIG wind turbine connected to a weak grid

Abulanwar

Chen

Iov

2013

2013 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)

View full text Add to dashboard Cite

“…As for a weak grid, there may be larger grid-frequency fluctuation such that a big error would be the result. As for sinusoidal signal, a SOGI [12,13] can be configured as a frequency-adaptive band-pass filter and QSG by using feedback from the output signal. The resulting structure is shown in …”

Section: Principle Of the Grid Virtual Flux Estimationmentioning

confidence: 99%

“…The decoupled double synchronous reference frame PLL (DDSRF-PLL) [10] can detect fundamental negative-sequence components or the specified harmonic components, but when the DDSRF-PLL is extended in multiple reference frames, decoupling cells would be very complicated because feedback decoupling of each component uses a rotation transformation. Some scholars use the optimal iterative method with symmetrical components and state-space filter to approach the input signal [11,12]. Rodriguez et al proposed a second-order generalized integrator-frequency-locked loop (SOGI-FLL) that makes improvements from an enhanced phase-locked loop by using the SOGI as the quadrature signal generator (QSG).…”

Section: Introductionmentioning

confidence: 99%

Frequency-adaptive grid-virtual-flux synchronization by multiple second-order generalized integrators under distorted grid conditions

Wang¹,

Liu²,

Han³

et al. 2015

Turk J Elec Eng & Comp Sci

View full text Add to dashboard Cite

Abstract:With some of the intermittent new energy and large nonlinear loads, grid voltage unbalance, harmonics, and frequency deviation are increasing year by year. The voltage source converter (VSC) is seriously affected by the various unexpected factors, and the presence of grid impedance makes the situation worse. In order to make the VSC track the nonideal grid quickly and accurately, this paper proposes a frequency-adaptive grid-virtual-flux synchronization by multiple second-order generalized integrators (MSOGI-GVFS). Key expressions of the MSOGI-GVFS and its frequency response characteristics are described in this paper. A second-order generalized integrator configured as a quadrature signal generator generates a specific-frequency virtual flux. A harmonics decoupling network achieves fundamental and harmonic components of the virtual flux. The positive-and negative-sequence components are separated by multiple positive-and negative-sequence calculators. A frequency-locked loop is used to track the grid angular frequency. Finally, after compensating the voltage and the flux on the grid impedance and the filtering inductor, it accurately achieves the estimation of the grid virtual flux in the highly polluted grid environment. This method may reduce the voltage sensors, eliminate the influence of grid impedance, and track the grid frequency quickly, which contributes to the stability of the VSC. The good performance of MSOGI-GVFS is verified by simulation and experimental results.

show abstract

Advanced Grid Synchronization System for Power Converters under Unbalanced and Distorted Operating Conditions

Cited by 368 publications

References 10 publications

Performance Analysis of Three-Phase Phase-Locked Loops for Distorted and Unbalanced Grids

Performance Analysis of Three-Phase Phase-Locked Loops for Distorted and Unbalanced Grids

Improved FRT control scheme for DFIG wind turbine connected to a weak grid

Frequency-adaptive grid-virtual-flux synchronization by multiple second-order generalized integrators under distorted grid conditions

Contact Info

Product

Resources

About