Multiresonant Frequency-Locked Loop for Grid Synchronization of Power Converters Under Distorted Grid Conditions

Rodríguez, Pedro; Luna, Álvaro; Candela, Ignacio; Mujal, R.; Teodorescu, Remus; Blaabjerg, Frede

doi:10.1109/tie.2010.2042420

Cited by 923 publications

(616 citation statements)

References 44 publications

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“…In this structure, SOGI Quadrature Signal Generations (SOGI-QSGs) are combined in parallel to detect and extract fundamental, third, fifth harmonics individually. This method has a good disturbance rejection capability, high filter capability, fast dynamic response and medium computation burden [17].…”

Section: B Fault Current Limiter Strategymentioning

confidence: 99%

A secondary-control based fault current limiter for four-wire three phase inverter-interfaced DGs

Beheshtaein

Savaghebi

Guerrero

et al. 2017

IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society

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Abstract-Fault current limiters (FCLs) are one class of solutions to cope with the upcoming challenges in microgrid protection. Considering high penetration of distributed generations (DGs) in microgrids, the necessity of designing cheap and effective FCL is getting higher. This paper attempts to fill this gap by proposing an embedded FCL operating based on modifying the secondary control of DGs. As this method is designed for fourwire system, besides cost-effectiveness, it has independency and flexibility to only limit the fault current of DG. In order to validate the proposed method, different types of faults are examined through an extensive simulation study.

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Section: B Fault Current Limiter Strategymentioning

confidence: 99%

A secondary-control based fault current limiter for four-wire three phase inverter-interfaced DGs

Beheshtaein

Savaghebi

Guerrero

et al. 2017

IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society

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“…The reference current for BPSC strategy is inspired from (17) and is expressed as: From (44) it could be inspired that for keeping the phase currents safely to rated value, the maximum reference reactive power must be reduced in proportion of V + .…”

Section: B Maximum Phase Current For Bpsc Strategymentioning

confidence: 99%

“…7. A voltage sequence extraction block based on Double Second Order Generalized Integrator (DSOGI) accompanied by a Frequency Locked Loop (FLL) presented in [17] is responsible for the positive and negative sequence voltage extraction in stationary reference frame. …”

Section: Overall Control Schemementioning

confidence: 99%

Control of D-STATCOM during unbalanced grid faults based on DC voltage oscillations and peak current limitations

Khoshooei

Moghani

Milimonfared

et al. 2016

2016 IEEE Energy Conversion Congress and Exposition (ECCE)

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Abstract-The safe operation of grid connected power converters during abnormal condition is a key issue in order to guarantee its operation and to avoid undesired trips. In this paper different control methods for the operation of a D-STATCOM are evaluated, where the reference currents are determined in such a way that none of the phase currents goes over the limits, as well as the DC voltage fluctuations remain in safe operation limit. Therefore, the contribution of this paper lays on the combination of the DC voltage oscillations and the current limit control. As it is shown in the following, three different control strategies are evaluated. The amplitude of the oscillations which are superimposed on the DC voltage as well as peak amplitude of the phase currents are calculated for each, considering a generic imbalance in the network. The effectiveness of the presented control strategies are verified by simulating a D-STATCOM tied to an industrial distribution network. Moreover a scaled scenario has been reproduced experimentally which shows that the results cope well with the analytical equations and the simulation results.

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“…In the seriously distorted grid, a cross-feedback network consisting of multiple SOGI-QSGs with different filter frequencies can accurately detect the fundamental and harmonic components of the grid voltage, called the HDN [13] as shown in Figure 9. The HDN can be seen as a plurality of different adaptive filters with n selectable center frequencies in parallel pairs, named as DSOGI-QSG-i.…”

Section: Under Unbalanced and Distorted Grid Conditionsmentioning

confidence: 99%

“…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). This approach not only detects positive-and negative-sequence fundamental components of the grid, but it also takes low-order harmonics expansion into consideration [13]. This approach can also be adapted to the changes in the grid frequency.…”

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

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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.

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Multiresonant Frequency-Locked Loop for Grid Synchronization of Power Converters Under Distorted Grid Conditions

Cited by 923 publications

References 44 publications

A secondary-control based fault current limiter for four-wire three phase inverter-interfaced DGs

A secondary-control based fault current limiter for four-wire three phase inverter-interfaced DGs

Control of D-STATCOM during unbalanced grid faults based on DC voltage oscillations and peak current limitations

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

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