Multi-oscillatory current control with anti-windup for grid-connected VSCs operated under distorted grid voltage conditions

Gałecki, Andrzej T.; Grzesiak, Lech M.; Ufnalski, Bartłomiej; Kaszewski, Arkadiusz; Michalczuk, Marek

doi:10.23919/epe17ecceeurope.2017.8099306

Cited by 11 publications

(14 citation statements)

References 13 publications

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“…In the transient-state, a fast dynamic response has been provided. Moreover, the adjusting mechanism of the damping factor for the oscillatory terms is applied as well as in [20,21], result-ing in almost complete suppression of oscillatory terms in the transient-states linked with the load variation, limiting their influence on the control signals.…”

Section: Numerical Resultsmentioning

confidence: 99%

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Particle swarm optimization of the multioscillatory LQR for a three-phase grid-tie converter

Gałecki

Michalczuk

Kaszewski

et al. 2018

ELECTROTECHNICAL REVIEW

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This paper presents an evolutionary optimization of the linear-quadratic (LQ) current controller for a three-phase grid-tie voltage source converter with an L-type input filter. The current control system is equipped with multi-oscillatory terms, which enable the converter to obtain nearly sinusoidal shape and balanced input currents under unbalanced and distorted grid voltage conditions. The augmentation of the state vector to include additional states which describe dynamics of disturbances increases the number of weights to be selected for a cost function in the LQR procedure design. Therefore, it is proposed that optimal weighting factors are sought using particle-swarm-based method. Finally, the simulational tuning based on the linear model and the numerical verification based on a non-linear model of the system with a pulse width modulator are addressed. Streszczenie. Artykuł prezentuje optymalizację ewolucyjną liniowo-kwadratowego regulatora prądu dla trójfazowego przekształtnika sieciowego z filtrem wejściowym typu L. Układ regulacji prądu jest wypozażony w człony oscylacyjne co pozwala na kształtowanie niemal sinusoidalnych i symetrycznych prądów wejściowych w warunkach występowania wyższych harmonicznych i asymetrii napięć sieci. Rozszerzenie wektora stanu o dodatkowe stany opisujące dynamikę zakłóceń zwiększa liczbę wag, które należy dobrać dla funkcji celu ujętej w procedurze projektowania LQR. Dlatego zaproponowano dobór optymalnych wsółczynników wagowych przy użyciu optymalizacji metodą roju cząstek. Finalnie zostały omówione strojenie symulacyjne na modelu liniowym oraz weryfikacja numeryczna na modelu nieliniowym z modulatorem szerokości impulsów. (Optymalizacja rojem cząstek regulatora liniowo-kwadratowego z członami oscylacyjnymi dla trójfazowego przekształtnika sieciowego)

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Section: Numerical Resultsmentioning

confidence: 99%

“…In the proportional-integral part, the integrator clamping method is used. In the oscillatory part, the strategy based on adjusting the damping factor ζ of a damped oscillatory terms has been applied as presented in [20,21]. Therefore, the details of this issue have been omitted here.…”

Section: System Descriptionmentioning

confidence: 99%

Particle swarm optimization of the multioscillatory LQR for a three-phase grid-tie converter

Gałecki

Michalczuk

Kaszewski

et al. 2018

ELECTROTECHNICAL REVIEW

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“…That is why some degree of damping is recommended. This damping does not have to be constant -it is common practice to vary it according to the state of the actuator (in our case the converter), and increase it if the actuator saturates [14]. By discretizing G 1 (s) using e.g.…”

Section: Model Of the Input Using Resonant/oscillatory Elementsmentioning

confidence: 99%

On the similarity and challenges of multiresonant and iterative learning current controllers for grid converters and why the disturbance feedforward matters

Ufnalski¹

2018

ELECTROTECHNICAL REVIEW

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There are two main techniques to solve the reference tracking problem for repetitive references and under repetitive disturbances, namely multiresonant (a.k.a. multioscillatory) controllers and iterative learning controllers. Nevertheless, neither of the approaches is a definitive winner, which is to be demonstrated herein. Both have their strengths, weaknesses and challenges. A grid-tie converter will be the case study here. The goal is to draw or inject sinusoidal currents under distorted grid voltage conditions. The supporting feedforward controller will be addressed within the context of the discussed repetitive control task. The case will be illustrated using numerical simulations. Our main goal is to make practitioners familiar with the relationships between these two control methods. Streszczenie. Istnieją dwia główne sposoby rozwiązywania zadania regulacji nadążnej dla powtarzalnego sygnału zadanego w obecności powtarzalnego zakłócenia, jest to zastosowanie regulatorów wielorezonansowych (zwanych też wielooscylacyjnymi) oraz regulatorów z uczeniem iteracyjnym. Jednakżadnego z tych rozwiązań nie można uznać za jednoznacznie lepsze, co zostanie tutaj pokazane. Oba cechują zarówno mocne strony, jak i pewne słabości oraz wyzwania implementacyjne. Przekształtnik sieciowy posłuży tutaj za przykład. Celem jest pobieranie lub oddawanie sinusoidalnego prądu sieci pomimo odkształconego napięcia. Omówione zostanie również sprzężenie w przód od zakłócenia w kontekście zadania sterowania powtarzalnego. Zagadnienie zostanie zilustrowane przy użyciu symulacji komputerowych. Naszym głównym celem jest pokazanie praktykom związków pomiędzy tymi dwiema metodami sterowania. (O podobieństwach i wyzwaniach regulatorów wielorezonansowych i regulatorów z uczeniem iteracyjnym dla przekształtników sieciowych oraz dlaczego sprzężenie w przód ma znaczenie)

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“…They have been applied in motor drives, 2 AC power supplies, 3 and various types of power grid connected devices 4 . In this paper, proportional‐resonant second order generalized integrator (SOGI) 5 and reduced order generalized integrator (ROGI) 4,6‐8 based AC current controllers are addressed, since they are increasingly being used, especially where devices require selective harmonic compensation 9‐13 …”

Section: Introductionmentioning

confidence: 99%

“…4 In this paper, proportional-resonant second order generalized integrator (SOGI) 5 and reduced order generalized integrator (ROGI) 4,[6][7][8] based AC current controllers are addressed, since they are increasingly being used, especially where devices require selective harmonic compensation. [9][10][11][12][13] LIST OF SYMBOLS AND ABBREVIATIONS: G mf SOGI (s), novel ROGI multifrequency controller, V/V; ω cutoff , controller cutoff frequency, rad/s; h max , maximum controller harmonic term order; φ r , controller phase lag at cutoff frequency, Rad; g aw , back-propagation anti-windup controller gain, V/V; I * αβ , current reference vector, V; I αβ , current measurements vector, V; Y αβ , regulator output vector, V; Y αβL , limited regulator output vector, V; ρ, regulator output vector amplitude, V; ρ L , limited regulator output vector amplitude, V; θ, regulator output vector angle, rad; T s , sampling period, S; G VSI (s), VSI equivalent transfer function, V/V; K VSI , VSI equivalent gain, V/V; T d , VSI equivalent time delay, seconds; R, load resistance, Ω; L, load inductance, H; ω marg , controller design auxiliary frequency, rad/s; φ PM , controller phase margin, rad; G aw (z), back-propagation anti-windup transfer function, V/V; D αβ , disturbance vector, V; I * dq , current reference vector in dq reference frame, A; t r , current response rising time, seconds; t set , current response settling time, seconds; o s , current response overshoot, %.…”

Section: Introductionmentioning

confidence: 99%

Modified multifrequency resonant current controller

Stojić

Ninkovic

Lukić

et al. 2020

Int Trans Electr Energ Syst

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Summary In this paper, a modified multifrequency resonant current controller is proposed for application in three‐phase power converters. The modifications include a novel controller structure combined with a corresponding parameter tuning procedure. We outlined the novel tuning procedure together with an original anti‐windup algorithm, which we used in proportional‐resonant (PR) controllers based on second order generalized integrator (SOGI) and reduced order generalized integrator (ROGI) methods. We tested and verified the control structure through a set of simulations and experimental tests. When compared to a reference solution, the novel controller enables simpler parameter tuning, faster settling times, and operation with a smaller margin between the controller cutoff frequency and maximum multifrequency controller harmonic frequency.

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Multi-oscillatory current control with anti-windup for grid-connected VSCs operated under distorted grid voltage conditions

Cited by 11 publications

References 13 publications

Particle swarm optimization of the multioscillatory LQR for a three-phase grid-tie converter

Particle swarm optimization of the multioscillatory LQR for a three-phase grid-tie converter

On the similarity and challenges of multiresonant and iterative learning current controllers for grid converters and why the disturbance feedforward matters

Modified multifrequency resonant current controller

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