Parameter Optimization of an Interval Robust Controller of a Buck Converter Subject to Parametric Uncertainties

Marcillo, Kevin Eduardo Lucas; Guingla, Douglas Antonio Plaza; Rocha, Erick Melo; Barra, Walter; Benavides, David Alejandro Vaca; Medeiros, Renan Landau Paiva de

doi:10.1109/etcm.2018.8580301

Cited by 4 publications

(5 citation statements)

References 7 publications

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“…Each converter can be considered an independent subsystem; therefore, the dynamics of the system can be simplified to the analysis of two independent converters. The dynamic behavior of buck converter, in Continuous Conduction Mode (CCM), can be found in [40] and [41].…”

Section: Mathematical Model For Multi-converter Buck-buck Systemmentioning

confidence: 99%

“…However, there are other problems apart from the CPL, e.g., uncertainties present in the system parameters, which may lead to performance degradation [38]. In literature can be found control strategies applied to DC-DC power converters that deal with parametric uncertainties [39]- [41].…”

Section: Introductionmentioning

confidence: 99%

“…However, in [39], a novel multivariable robust parametric technique was used for minimizing coupling effect in single inductor multiple output DC-DC converter operating in continuous conduction mode. Moreover, in [40] and [41], the use of Robust Parametric Control (RPC) techniques is proposed to stabilize oscillations at the output of a buck converter caused by parametric uncertainties.…”

Section: Introductionmentioning

confidence: 99%

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Interval Robust Controller to Minimize Oscillations Effects Caused by Constant Power Load in a DC Multi-Converter Buck-Buck System

et al. 2019

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Multi-converter electronic systems are becoming widely used in many industrial applications; therefore, the stability of the whole system is a big concern to the real-world power supplies applications. A multi-converter system comprised of cascaded converters has a basic configuration that consists of two or more converters in series connection, where the first is a source converter that maintains a regulated dc voltage on the intermediate bus while remaining are load converters that convert the intermediate bus voltage to the tightly regulated outputs for the next system stage or load. Instability in cascaded systems may occur due to the constant power load (CPL), which is a behavior of the tightly regulated converters. CPLs exhibit incremental negative resistance behavior causing a high risk of instability in interconnected converters. In addition, there are other problems apart from the CPL, e.g., non-linearities due to the inductive element and uncertainties due to the imprecision of a mathematical model of dc-dc converters. Aiming to effectively mitigate oscillations effects in the output of source converter loaded with a CPL, in this paper, an interval robust controller, by linear programming based on Kharitonov rectangle, is proposed to regulate the output of source converter. Several tests were developed by using an experimental plant and simulation models when the multi-converter buck-buck system is subjected to a variation of power reference. Both simulation and experimental results show the effectiveness of the proposed controller. Furthermore, the performance indices computed from the experimental data show that the proposed controller outperforms a classical control technique. INDEX TERMS Constant power load (CPL), multi-converter buck-buck system, parametric uncertainties, robust control based on Kharitonov rectangle, mitigation oscillations in multi-converter buck-buck system.

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Section: Mathematical Model For Multi-converter Buck-buck Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Interval Robust Controller to Minimize Oscillations Effects Caused by Constant Power Load in a DC Multi-Converter Buck-Buck System

et al. 2019

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“…Each converter (see Fig 5) can be considered an independent subsystem; therefore, the dynamics of the system can be simplified to the analysis of two independent converters. The dynamic behavior of buck converter, in Continuous Conduction Mode (CCM), can be found in the literature [11], [32].…”

Section: Mathematical Model Of the Studied DC Microgridmentioning

confidence: 99%

“…Furthermore, in [32] and [33], the use of RPC techniques is proposed to stabilize oscillations at the output of a buck converter caused by parametric uncertainties. Recently, the study developed in [34] addressed an outstanding contribution for the current state-of-the-art on the study of parametric uncertainties in DC-DC converters, its approach is focused only on a posterior analysis of system stability.…”

Section: Introductionmentioning

confidence: 99%

Novel Robust Methodology for Controller Design Aiming to Ensure DC Microgrid Stability Under CPL Power Variation

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In recent years, dc microgrid (MG) is increasing rapidly in electric power grids and other isolated systems, integrating more efficiency and suite better some of the renewable energy sources, storage units, and dc loads. However, dc MG stability analysis becomes a challenge when constant power loads (CPLs) are applied to dc bus, which introduces destabilizing effects in the system due to its negative impedance characteristics. This paper presents a novel robust controller, based on linear programming based on the Chebyshev theorem as a robust control technique considering the Kharitonov's theorem that ensures the minimization of the total deviation from the desired performance in a closed-loop system, specified by a family of characteristic polynomials. The purpose of the proposed controller is to tightly regulate the dc bus voltage, ensuring MG stability due to the effects of power variation on CPLs. The simulation and experimental tests are performed by using a MATLAB/Simulink simulator and a developed prototype of the DC MG system, respectively, to ratify the robustness and effectiveness of the proposed method of robust controller design.INDEX TERMS Constant power load (CPL), Chebyshev theorem, DC microgrid (MG), Kharitonov stability theorem, microgrid stability, robust control design.

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Stochastic Control for DC–DC Power Converters: A Generalized Minimum Variance Control Approach

et al. 2020

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Parameter Optimization of an Interval Robust Controller of a Buck Converter Subject to Parametric Uncertainties

Cited by 4 publications

References 7 publications

Interval Robust Controller to Minimize Oscillations Effects Caused by Constant Power Load in a DC Multi-Converter Buck-Buck System

Interval Robust Controller to Minimize Oscillations Effects Caused by Constant Power Load in a DC Multi-Converter Buck-Buck System

Novel Robust Methodology for Controller Design Aiming to Ensure DC Microgrid Stability Under CPL Power Variation

Stochastic Control for DC–DC Power Converters: A Generalized Minimum Variance Control Approach

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