Design and experimental implementation of a new robust observer-based nonlinear controller for DC-DC buck converters

Abdelmalek, Salem; Dali, Ali; Bakdi, Azzeddine; Bettayeb, Maâmar

doi:10.1016/j.energy.2020.118816

Cited by 30 publications

(21 citation statements)

References 49 publications

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“…This index is defined in Eq. (11). In this study, two different dynamic shading conditions are defined and two MPPT approaches are compared using SBC and P&O algorithm.…”

Section: Discussionmentioning

confidence: 99%

“…The efficiency change of the converter operated at different frequencies has been examined and it has been observed that the frequency has a serious effect on the efficiency. In [11], a new robust observer nonlinear control is proposed. SBC is a circuit used for MPPT purposes in PV systems in order to obtain high efficiency in low voltage applications.…”

Section: Article Info Abstractmentioning

confidence: 99%

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Submodule based MPPT with synchronous buck converter under dynamic partial shading conditions

Başoğlu¹

2021

European Journal of Technic

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In order to obtain more power from photovoltaic (PV) modules under mismatching operating conditions, the submodule-based MPPT technique is an important solution. In this technique, since the power-voltage (P-V) curve of a submodule cannot be multi-peaked, the maximum power point (MPP) tracking (MPPT) is easily achieved through a DC-DC converter connected to each submodule. Since the P-V curve cannot be in a multi-peaked form, the maximum power can be obtained with a simple MPPT algorithm. For this reason, perturb & observe (P&O) algorithm can be chosen. In this study, the behaviour of a submodule-based MPPT with synchronous buck converter (SBC) is investigated for dynamic shading conditions. In addition, submodule-based MPPT and module-based MPPT technique were compared and the comparison was confirmed by simulation studies that submodule-based MPPT performed better. In this context, simulation studies were carried out for different shading conditions. According to the simulation results, the submodulebased MPPT approach achieves greater efficiencies to the module-based MPPT. In some simulations, when the module-based MPPT technique is used, the operation at the local MPP has been realized. In such cases, more advanced algorithms are needed. However, a simple algorithm is sufficient in submodule-based MPPT. The only disadvantage of this MPPT is the high hardware cost. However, the increase in efficiency obtained is at a level that can easily tolerate this cost.

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“…This index is defined in Eq. (11). In this study, two different dynamic shading conditions are defined and two MPPT approaches are compared using SBC and P&O algorithm.…”

Section: Discussionmentioning

confidence: 99%

Section: Article Info Abstractmentioning

confidence: 99%

Submodule based MPPT with synchronous buck converter under dynamic partial shading conditions

Başoğlu¹

2021

European Journal of Technic

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“…Given the following Equation ( 14) modifying the coefficient −1/2 when the control leads to the output to stagnate in a fixed error in a steady state. Changing Equation ( 14) by Equation (15), as follows:…”

Section: The Proposed Methodologymentioning

confidence: 99%

“…To ensure the desired output of the boost converter, control techniques of a pulse width modulated signal (PWM) are used. Different control techniques have been used to control the desired signals for the boost converter and other converters, such as the PI [8,[13][14][15][16], PID [17][18][19], frequency-domain control techniques such as the method of sliding modes [6,20,21], fuzzy logic [22,23], and inverse optimal control [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Robust Inverse Optimal Control for a Boost Converter

2021

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The variability of renewable energies and their integration into the grid via power electronics demands the design of robust control algorithms. This work incorporates two techniques to ensure the stability of a boost converter through its state equations, implementing the inverse optimal control and the gain-scheduling technique for robust control settings. In such a way that, under a single adjustment, it is capable of damping different changes such as changes in the parameters, changes in the load, the input voltage, and the reference voltage. On the other hand, inverse optimal control is based on a discrete-time control Lyapunov function (CLF), and CLF candidate depends on fixed parameters that are selected to obtain the solution for inverse optimal control. Once these parameters have been found through heuristic or artificial intelligence methods, the new proposed methodology is capable of obtaining a robust optimal control scheme, without having to search for new parameters through other methods, since these are sometimes sensitive changes and many times the process of a new search is delayed. The results of the approach are simulated using Matlab, obtaining good performance of the proposed control under different operation conditions. Such simulations yielded errors of less than 1% based on the voltage reference, given the disturbances caused by changes in the input variables, system parameters, and changes in the reference. Thus, applying the new methodology, the stability of our system was preserved in all cases.

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“…Transient performance and robustness against uncertainties/perturbations were improved. In (Abdelmalek et al, 2020) a sliding mode approach with two extra states augmentation was suggested. The control strategy considered a nonlinear observer for state estimations.…”

Section: Introductionmentioning

confidence: 99%

Experimental Validation of Voltage Regulation in Buck Converters through Fractional-Order PID Approximation

Soto-Vega

Soriano-Sánchez

2021

IJONEST

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Viability of a fractional-order PID approximation regulating voltage in buck converters through a single control loop is investigated. Fractional calculus approach is suggested due to it exhibits good robustness against parameter variations. The non-integer approach is integrated in the control strategy through a Laplacian operator biquadratic approximation to generate a flat phase curve in the system closed-loop frequency response, which results in the generation of the iso-damping characteristic. The synthesis and tuning process consider both robustness and closed-loop requirements to ensure a fast and stable regulation characteristic. Experimental data obtained with the resulting controller, which was easy implemented through RC circuits and OPAMPs in adder configuration, confirmed its effectiveness. Superiority of proposed approach, which is determined through a comparison with typical PID controllers, confirms its viability to be used in highly efficient converters, such as Silicon-Carbide ones.

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Design and experimental implementation of a new robust observer-based nonlinear controller for DC-DC buck converters

Cited by 30 publications

References 49 publications

Submodule based MPPT with synchronous buck converter under dynamic partial shading conditions

Submodule based MPPT with synchronous buck converter under dynamic partial shading conditions

Robust Inverse Optimal Control for a Boost Converter

Experimental Validation of Voltage Regulation in Buck Converters through Fractional-Order PID Approximation

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