Adaptive nonlinear control of series APFs: Harmonics grid voltage compensation and inverter DC voltage regulation

Chihab, A. Ait; Ouadi, Hamid; Giri, F.; Majdoub, Khalid El

doi:10.1109/cca.2014.6981448

Cited by 5 publications

(3 citation statements)

References 12 publications

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“…In the case of linear dependence between the magnetic coil flux φ and the corresponding current i (i.e., no magnetic saturation) (Chihab et al 2014), we have φ Table 2 vanish and the adaptive control laws (51)-(52) are reduced to…”

Section: Remarkmentioning

confidence: 99%

Adaptive Nonlinear Control of Three-Phase Series Active Power Filters with Magnetic Saturation

Ouadi

Aitchihab

Giri

2020

J Control Autom Electr Syst

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The problem of controlling three-phase series active power filters (series APF) is addressed in the presence of nonlinear loads. In previous works, the control design for series APF is generally based on standard models that assume the involved magnetic coil to be linear. In reality, the magnetic characteristics of these components are nonlinear. In this paper, a new model for series APF load system, taking into account for the nonlinearity of coil characteristics, is developed. Based on the new model, a nonlinear adaptive controller is developed, using the backstepping design. The control objectives is twofold: (i) compensating for the harmonic and disturbed voltages components at the point of common coupling, this objective is referred to network voltage quality; and (ii) regulating the inverter DC capacitor voltage. Moreover, the controller is made adaptive for compensating the uncertainty on the switching loss power. The performances of the proposed adaptive controller are formally analyzed using tools from the Lyapunov stability and average theory. The supremacy of the proposed controller with respect to standard control solution is illustrated through simulation. Keywords Adaptive control • Active power filters • Magnetic saturation • Voltage quality • Lyapunov stability • Average model 1 Introduction Several industrial and residential applications (such as switching power supplies, motor drivers and medical equipment, among others) are very sensitive to voltage network fluctuations. Indeed, the presence of these disturbances leads to problems of synchronization with line voltage, responsible for systems malfunctions. Moreover, the nonlinear load contributes strongly to generating disturbing voltage components. In fact, the circulation of current harmonics components through the line conductors generates additional voltage distortions at the point of common coupling (PCC). These voltage distortions are manifested by flickers, dips, interruptions and voltage harmonics, which are harmful for B A.

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Section: Remarkmentioning

confidence: 99%

Adaptive Nonlinear Control of Three-Phase Series Active Power Filters with Magnetic Saturation

Ouadi

Aitchihab

Giri

2020

J Control Autom Electr Syst

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“…The main circuit of the LCL-APF is shown in Figure 1 [22][23], where usa, usb and usc are grid voltage, i1x (x=a, b, c) is the converter-side current, L1 is the converter-side inductance, R1 is the parasitic resistance of converter-side inductor, i2x (x=a, b, c) is the grid-side current; L2 is the grid-side inductance; is the parasitic resistance of grid-side inductor, and Cg is the parallel capacitor. The voltage of the parallel capacitor and that of the direct current (DC)-side are denoted as Ugx (x=a, b, c) and Udc, respectively.…”

Section: Mathematical Modellingmentioning

confidence: 99%

Vector-Proportional-Integral Control of Inductor-Capacitor-Inductor Active Power Filter under the Alpha-Beta Stationary Coordinate System

Liu¹,

Zhou²,

Sai³

2020

EJEE

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The proportional-resonant (PR) controller is a traditional tool for current control. Due to the phase jump at the resonance point, the PR controller cannot compensate for the current in the inductor-capacitor-inductor (LCL)-based active power filter (APF) in a precise manner. To solve the problem, this paper puts forward a vector-proportional-integral (VPI) current control strategy, which relies on the VPI controller to compensate for the harmonic current of the n-th order under the alpha-beta (α-β) stationary coordinate system. Through theoretical analysis and contrastive experiment, it is learned that the closed-loop transfer function of the VPI controller satisfies 0dB of amplitude-frequency at the resonance point, and controls the phase response at the resonance frequency at 0°. Hence, the VPI strategy can track the harmonic current with no error, and thus fully compensate for the harmonic current. The proposed control strategy improves the current compensation precision of APFs, and provides a reference for enhancing the power quality of the grid.

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“…In general, the proposed algorithms require complex mathematical calculation. In the present work a simple method of references extraction, proposed in [10]. It's based on the computation of the voltage distortion (denotes ( )), from the actual measured grid voltage ( ).…”

Section: Iii1 Voltages References Generationmentioning

confidence: 99%

Non linear control of the UPQC for grid current and voltage improvement

Abderrahmane

Ouadi

Giri

2015

2015 Third World Conference on Complex Systems (WCCS)

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The problem of controlling Unified power Quality Conditioners (UPQC) is addressed in presence of nonlinear loads. In this paper, a oriented control model for UPQCload system, is developed. The control objective is threefold: (i) Compensating for the current harmonics and the reactive power absorbed by the nonlinear load; (ii) Compensating for the voltage harmonics and fluctuations; (ii) Regulating the inverter DC capacitor voltage. To this end, based on the UPQC model, a nonlinear controller is developed, using the backstepping technical design. Moreover, the controller is made adaptive for compensating the uncertainty on the switching loss power. The performances of the proposed adaptive controller are formally analyzed using tools from the Lyapunov stability and the averaging theory. The performances of the proposed controller is illustrated through simulation

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Adaptive nonlinear control of series APFs: Harmonics grid voltage compensation and inverter DC voltage regulation

Cited by 5 publications

References 12 publications

Adaptive Nonlinear Control of Three-Phase Series Active Power Filters with Magnetic Saturation

Adaptive Nonlinear Control of Three-Phase Series Active Power Filters with Magnetic Saturation

Vector-Proportional-Integral Control of Inductor-Capacitor-Inductor Active Power Filter under the Alpha-Beta Stationary Coordinate System

Non linear control of the UPQC for grid current and voltage improvement

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