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Bibliografie tematiche / DC robustness

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Letteratura scientifica selezionata sul tema "DC robustness"

Autore: Grafiati

Pubblicato: 1 marzo 2025

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Articoli di riviste sul tema "DC robustness"

1

Elvin Yusubov, Elvin Yusubov. "ROBUSTNESS AND CONTROL ISSUES OF DC MICROGRIDS". PAHTEI-Procedings of Azerbaijan High Technical Educational Institutions 47, n. 12 (20 dicembre 2024): 29–39. https://doi.org/10.36962/pahtei47122024-03.

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DC microgrids have a number of advantages compared to traditional AC systems, including enhanced stability, better integration of renewable energy sources, and improved reliability. However, there are many challenges in DC microgrids that must be solved before the wide adoption of their use. This article focuses on the key problems associated with DC microgrids, including voltage stability, fault management, and power quality. Besides, a number of control strategies and technologies are developed to enhance the performance of DC microgrids. Keywords: Information measurement system, DC-DC converters, DC microgrid, measurements in microgrids.

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2

Leung, F. H. F., H. K. Lam, T. H. Lee e P. K. S. Tam. "Fuzzy control of DC-DC switching converters: stability and robustness analysis". Australian Journal of Electrical and Electronics Engineering 4, n. 1 (gennaio 2008): 91–100. http://dx.doi.org/10.1080/1448837x.2008.11464176.

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3

Jiao, Junsheng, e Xueying Cui. "Robustness Analysis of Sliding Mode on DC/DC for Fuel Cell Vehicle". Journal of Engineering Science and Technology Review 6, n. 5 (dicembre 2013): 1–6. http://dx.doi.org/10.25103/jestr.065.01.

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4

Ba, Qin, e Ketan Savla. "Robustness of DC Networks With Controllable Link Weights". IEEE Transactions on Control of Network Systems 5, n. 3 (settembre 2018): 1479–91. http://dx.doi.org/10.1109/tcns.2017.2724842.

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5

Mosskull, Henrik. "Performance and robustness evaluation of dc-link stabilization". Control Engineering Practice 44 (novembre 2015): 104–16. http://dx.doi.org/10.1016/j.conengprac.2015.06.011.

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6

Bensaada, M., S. Della Krachai e F. Metehri. "Proposed Fuzzy Logic Controller for Buck DC-DC Converter". International Journal of Fuzzy Systems and Advanced Applications 7 (5 febbraio 2021): 24–28. http://dx.doi.org/10.46300/91017.2020.7.5.

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This paper provides the design for buck DC-DC converter system using fuzzy logic as well as sliding mode method. Design of fuzzy logic controller will be based on improvement of imperfection of the sliding mode controller, in particular the robustness and response time of the system. The simulation results of both systems using fuzzy logic and sliding mode are shown as well as compared to signify better of the two.

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7

Korompili, Asimenia, e Antonello Monti. "Review of Modern Control Technologies for Voltage Regulation in DC/DC Converters of DC Microgrids". Energies 16, n. 12 (7 giugno 2023): 4563. http://dx.doi.org/10.3390/en16124563.

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This paper provides an overview of modern feedback control methods for the voltage regulation in DC/DC converters of DC microgrids. Control objectives and practical restrictions are defined and used as indicators for the analysis and performance assessment of the control methods. After presenting the concept of each control method, the advantages and limitations in the converter applications are discussed. The main conclusions of this overview can be used as recommendations for the selection of the suitable control method according to the control requirements in the DC microgrid. The low robustness against disturbances is a major issue in all control methods. For the enhancement of the robustness of the feedback control methods, three approaches are reviewed. Applications of these approaches in DC/DC converters are compared with regard to the achieved disturbance rejection and the related cost of nominal performance degradation. The disturbance/uncertainty estimation and attenuation (DUEA) framework appears to be the most promising approach to compromising these opposing control objectives. This overview is presented for a general DC/DC converter, without any additional control design requirement imposed by a specific converter plant. This allows the generalisation of the conclusions of the performance assessment, which can facilitate the application of the control methods in similar systems, such as in AC/DC converters or motor drives.

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8

Wu, Yu, Du e Shi. "Feedforward-Double Feedback Control System of Dual-Switch Boost DC/DC Converters for Fuel Cell Vehicles". Energies 12, n. 15 (26 luglio 2019): 2886. http://dx.doi.org/10.3390/en12152886.

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DC/DC converters for fuel cell electric vehicles need not only high boost ratio and high efficiency, but also strong anti-jamming capability. Therefore, it is especially important to devise a control method with strong robustness under the premise of an appropriate topology. In this paper, a simple dual-switch boost converter topology is adopted. We use the state space averaging method to build a small signal model, and based on this model, we propose a feedforward-double feedback control system for continuous conduction mode (CCM) mode. Simulation and experimental results show that the proposed feedforward-double feedback control system improves the robustness of the system while ensuring a high boost ratio and efficiency, and solves the problem of weak output characteristics of fuel cells. The control effect is similar to the sliding mode control, which is known for its robustness, while the rise time of step response is only 1/10 of that of the voltage feedback control system. When the output voltage of the DC/DC converter is 55 V, the DC/DC converter using feedforward-double feedback control system is more robust than the voltage feedback control system under sudden change of load.

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9

Alarcón-Carbajal, Martin A., José E. Carvajal-Rubio, Juan D. Sánchez-Torres, David E. Castro-Palazuelos e Guillermo J. Rubio-Astorga. "An Output Feedback Discrete-Time Controller for the DC-DC Buck Converter". Energies 15, n. 14 (21 luglio 2022): 5288. http://dx.doi.org/10.3390/en15145288.

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This paper presents a discrete-time output feedback controller to regulate the output voltage of a DC-DC buck converter. The proposal’s main feature is the application of a discrete-time equivalent of the robust exact filtering differentiator. First, the document exposes a theoretical analysis of the closed-loop system, where it is considered the problem of implementing a real-time differentiator with a good relationship between exactness and noise filtration performance. Hence, secondly, the controller in a laboratory setup is presented. The first experimental results suggest that the proposed controller exhibits good robustness against noise and maintains the asymptotic accuracy, even with saturated control inputs, as in the case of the DC-DC buck converter. Consequently, aiming to verify the features of the proposed method, the controller is validated through multiple experiments, showing satisfactory voltage tracking accuracy, good suppression of instantaneous load and supply voltage disturbances, and robustness against bounded measurement noise.

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10

Oucheriah, Said, e Abul Azad. "Current-sensorless robust sliding mode control for the DC-DC boost converter". AIMS Electronics and Electrical Engineering 9, n. 1 (2025): 46–59. https://doi.org/10.3934/electreng.2025003.

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<p>A current-sensorless PWM-based robust sliding mode controller is proposed for the DC-DC Boost Converter, a nonminimum phase system that presents major challenges in the design of stabilizing controllers. The development of the controller requires the measurement of the output voltage and the estimation of its derivative. An extended state observer is developed to estimate a lumped uncertainty that comprises the uncertain load and input voltage, the converter parasitics, and the component uncertainties, and also to estimate the derivative of the output voltage. A linear sliding surface is used to derive the controller that is simple in its design and yet exhibits excellent features in terms of robustness to external disturbances, parameter uncertainties, and parasitics, despite the absence of the inductor current feedback. Also, a simple procedure to select the controller gains is outlined. The robustness of the controller is validated by computer simulations.</p>

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Più fonti

Tesi sul tema "DC robustness"

1

Gianopulos, Garron. "The robustness of Rasch true score preequating to violations of model assumptions under equivalent and nonequivalent populations". [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002646.

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2

Ma, Thi Thuong Huyen. "Evaluation of DC supply protection for efficient energy delivery in low voltage applications". Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1055/document.

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Actuellement, il y a une baisse du prix des ressources énergétiques distribuées, en particulier l'énergie solaire photovoltaïque, conduisant à la croissance significative de leur capacité d'installation dans de nombreux pays. D'autre part, les politiques encourageant l'efficacité énergétique ont favorisé le développement de charges DC dans les zones domestiques, telles que l'éclairage LED, les ordinateurs,, les téléphones, les téléviseurs, les moteurs DC efficaces et les véhicules électriques. Grace à ce changement, le système de distribution de microgrid DC devient plus attractive que le système de distribution à courant alternatif traditionnel. Les avantages principaux du microgrid DC sont l'efficacité énergétique plus élevée, plus facile à intégrer avec les sources d'énergie distribuées et le système de stockage. Alors que de nombreuses recherches se concentrent sur les stratégies de contrôle et la gestion de l'énergie dans le microgrid DC, sa protection reçoit une attention insuffisante et un manque de réglementation et d'expériences. La protection dans les réseaux DC est plus difficile que dans le réseau AC en raison de l'arc continu, de la valeur plus élevée du courant de courtcircuit et du taux de défaut de montée. En outre, dans les réseaux distribués à courant continu sont composés de nombreux dispositifs de commutation électroniques et semi-conducteurs, qui ne supportent le courant de défaut que quelques dizaines de microsecondes. Les disjoncteurs mécaniques, qui ont un temps de réponse de quelques dizaines de millisecondes, ne semblent pas satisfaire aux exigences de sécurité du microréseau à courant continu. L'absence d'un dispositif de protection efficace constitue un obstacle au développement du microgrid DC dans le système distribué. Cette thèse propose un disjoncteur DC auto-alimenté à courant continu utilisant normalement JFET SiC, qui offre un excellent dispositif de protection pour les microgrids DC grâce à son temps de réponse rapide et ses faibles pertes à l'état passant. La conception du disjoncteur DC à semi-conducteurs vise à répondre à deux objectifs: temps de réponse rapide et fiabilité. Les spécifications conçues et les énergies critiques qui entraînent la destruction du disjoncteur sont identifiées sur la base des résultats mesurés d'un JFET populaire dans le commerce. Un pilote de protection très rapide et fiable basé sur une topologie à convertisseur flyback avant est utilisé pour générer une tension négative suffisante pour tourner et maintenir le JFET SiC. Le convertisseur sera activé chaque fois que le disjoncteur détecte des défauts de court-circuit en détectant la tension de drain-source de JFET et crée une tension négative s'applique à la porte de JFET. Pour éviter une défaillance de la porte par surtension au niveau de la grille du JFET, la tension de sortie du convertisseur de retour vers l'avant est régulée à l'aide de la mesure coté primaire. Les résultats expérimentaux sur le prototype du disjoncteur DC ont validé les principes de fonctionnement proposés et ont confirmé que le disjoncteur DC à semi-conducteurs proposé peut interrompre le défaut en 3 μs. D'un autre côté, un modèle du JFET normalement activé dans l'environnement Matlab/Simulink est construit pour étudier les comportements du SSCB pendant une durée de court-circuit. L'accord entre la simulation et les résultats expérimentaux confirment que ce modèle JFET peut être utilisé pour simuler le fonctionnement d'un disjoncteur DC et dans l'étude du fonctionnement du microgrid DC pendant le processus de défaut et de compensation
Currently, there is a drop in the price of distributed energy resources, especially solar PVs, which leads to a significant growth of the installed capacities in many countries. On the other hand, policies encouraging energy efficiency have promoted the development of DC loads in domestic areas, such as LEDs lighting, computers, telephones, televisions, efficient DC motors and electric vehicles. Corresponding to these changes in sources and loads, DC microgrid distribution system becomes more attractive than the traditional AC distribution system. The main advantages of the DC microgrid are higher energy efficiency, easier in integrating with distributed energy sources and storage systems. While many studies concentrate on the control strategies and energy management in the DC microgrid, the protection still receives inadequate attention and lack of regulations and experiences. Protection in DC grids is more complex than AC grids due to the continuous arc, higher short circuit current value and fault rate of rising. Furthermore, the DC distributed grids are composed of many electronic and semiconductor switching devices, which only sustain the fault currents of some tens of microseconds. Mechanical circuit breakers, which have a response time in tens of milliseconds, seem not to meet the safety requirement of DC microgrids. The lack of effective protection devices is a barrier to the development of DC microgrids in the distributed systems. This thesis proposes a self-power solid state DC circuit breaker using normally-on SiC JFET, which offers a great protection device for DC microgrids due to its fast response time and low on-state losses. The design of the solid state DC circuit breaker aims to meet two objectives: fast response time and high reliability. The designed specifications and critical energies that result in the destruction of the circuit breaker are identified on the basis of the experiments of a commercial normally-on JFET. In addition, a very fast and reliable protection driver based on a forward-flyback converter topology is employed to generate a sufficient negative voltage to turn and hold off the SiC JFET. The converter will be activated whenever short-circuit faults are detected by sensing the drain-source voltage, then creating a negative voltage applied to the gate of JFET. To avoid gate failure by overvoltage at the gate of JFET, the output voltage of the forward-flyback converter is regulated using Primary Side Sensing technique. Experimental results validated the working principle of the proposed solid state DC circuit breaker with fault clearing time less than 3 μs. Additionally, a model of the normally-on JFET in Matlab/Simulink environment is built for exploring the behaviors of the solid-state DC circuit breaker during short-circuit faults. The agreement between the simulation and experimental results confirms that this JFET model can be appropriately used for the investigation of solid state DC circuit breaker operations and DC microgrids in general during fault evens and clearing fault processes

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3

Said, Nasri. "Evaluation de la robustesse des technologies HEMTs GaN à barrière AlN ultrafine pour l'amplification de puissance au-delà de la bande Ka". Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0425.

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La filière GaN est stratégique pour l'Union Européenne car elle permet d'améliorer la puissance et le rendement des systèmes radar et de télécommunication, notamment dans les bandes S à Ka (jusqu'à 30 GHz). Pour répondre aux besoins des futures applications, telles que la 5G et les systèmes militaires, le développement des technologies GaN vise à augmenter les fréquences jusqu'aux ondes millimétriques. Cela nécessite d'optimiser l'épitaxie et la réduction de la longueur de grille à moins de 150 nm, ainsi que l'utilisation de barrières ultrafines (<10 nm) pour éviter les effets de canaux courts. La substitution de la barrière AlGaN par du AlN représente une solution pour maintenir de bonnes performances tout en miniaturisant les composants. Dans ces travaux de thèse, plusieurs variantes technologiques à barrière AlN ultrafine (3 nm) sur des canaux GaN non-dopés de différentes épaisseurs, développées par le laboratoire IEMN sont étudiés. L'évaluation des performances et de la robustesse de ces technologies, cruciale pour leur qualification et utilisation dans des missions à long-terme, sont ainsi menées en mode DC et RF afin de définir les zones de sécurité de fonctionnement (SOA) et d’identifier les mécanismes de dégradation.La campagne de caractérisation DC et pulsée a révélé une faible dispersion des composants après leur stabilisation électrique, reflétant une bonne maîtrise technologique : ceci permet par ailleurs des études statistiques et des analyses génériques plus pertinentes sur l’ensemble des lots de composants étudiés. L'analyse de la sensibilité des dispositifs à des températures allant jusqu'à 200°C a prouvé la forte stabilité thermique des performances en mode diode et transistor, en suivant les indicateurs paramétriques représentatifs des modèles électriques des composants (courants de saturation et courants de fuite, tension de seuil, taux de retard aux commandes entrée sortie, …). L’ajout d’une barrière arrière AlGaN sur une couche tampon moyennement dopée C a réglé le compromis entre confinement des électrons et densités de pièges. Les tests de vieillissement accéléré en mode DC à différents points de polarisation et en mode RF par paliers de puissance d’entrée ont montré que la barrière arrière AlGaN confère une meilleure stabilité des courants de fuite et des courbes I(V) statiques, une réduction des effets de piégeage et d'auto-échauffement, ainsi qu'une extension de la SOA-DC opérationnelle. Les tests de vieillissement accéléré en mode dynamique à 10 GHz sur des HEMTs avec différents espacements grille-drain ont montré que la SOA-RF ne dépend pas de cet espacement, mais plutôt de la capacité de la grille à supporter des signaux RF élevés, avant dégradation brutale de cette dernière. En utilisant une méthode de modélisation non linéaire originale, prenant en compte le phénomène d'auto-polarisation, les dispositifs avec barrière AlGaN se sont révélés plus robustes également en RF. Cela se traduit par leur compression plus tardive de gain, allant jusqu’à +10dB et sans dégradation électrique ainsi que structurelle apparente (observée par photoluminescence). Indépendamment de la variante AlN/GaN, le mécanisme de dégradation en stress RF correspond au claquage abrupt de la grille Schottky conduisant à sa défaillance. Ces résultats prouvent que les composants sont plus sensibles aux conditions de polarisation DC qu’au niveau de signal RF injecté [...]
The GaN industry is strategic for the European Union because it enhances the power and efficiency of radar and telecommunication systems, especially in the S to Ka bands (up to 30 GHz). To meet the needs of future applications such as 5G and military systems, GaN technology development aims to increase frequencies to the millimeter-wave range. This requires optimizing epitaxy and reducing the gate length to less than 150 nm, as well as using ultrathin barriers (<10 nm) to avoid short-channel effects. Replacing the AlGaN barrier with AlN is a solution to maintain good performance while miniaturizing devices. In this thesis, several technological variants with an ultrathin AlN barrier (3 nm) on undoped GaN channels of various thicknesses, developed by the IEMN laboratory, are studied. The evaluation of the performance and robustness of these technologies, crucial for their qualification and use in long-term profil missions, is conducted in both DC and RF modes to define the safe operating areas (SOA) and identify degradation mechanisms.The DC and pulsed characterization campaign revealed low component dispersion after electrical stabilization, reflecting good technological control. This also allows for more relevant statistical studies and generic analyses across all component batches studied. The sensitivity analysis of the devices at temperatures up to 200°C demonstrated strong thermal stability in diode and transistor modes, following parametric indicators representative of the electrical models of the components (saturation currents and leakage currents, threshold voltage, gate and drain lags rates, ...). The addition of a AlGaN back-barrier on a moderately C-doped buffer layer resolved the trade-off between electron confinement and trap densities. Accelerated aging tests in DC mode at various biasing conditions and in RF mode by input power steps showed that the AlGaN back-barrier provides better stability in leakage currents and static I(V) curves, reduces trapping and self-heating effects, and extends the operational DC-SOA.Dynamic accelerated aging tests at 10 GHz on HEMTs with different gate-drain spacings showed that the RF-SOA does not depend on this spacing but rather on the gate's ability to withstand high RF signals before abrupt degradation occurs. Using an original nonlinear modeling method that considers the self-biasing phenomenon, devices with the AlGaN back-barrier proved to be more robust in RF as well. This is reflected in their later gain compression, up to +10 dB, without apparent electrical or structural degradation (as observed by photoluminescence). Regardless of the AlN/GaN variant, the RF stress degradation mechanism corresponds to the abrupt breakdown of the Schottky gate, leading to its failure. These results indicate that the components are more sensitive to DC bias conditions than to the level of injected RF signals [...]

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4

Ozakturk, Meliksah. "Power electronic systems design co-ordination for doubly-fed induction generator wind turbines". Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/power-electronic-systems-design-coordination-for-doublyfed-induction-generator-wind-turbines(ebe4de00-07ad-4b06-8b8d-79be291804e7).html.

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Wind turbine modelling using doubly-fed induction generators is a well-known subject. However, studies have tended to focus on optimising the components of the system rather than considering the interaction between the components. This research examines the interaction of the control methods for a doubly-fed induction generator (DFIG) in a wind turbine application integrating them with the crowbar protection control and DC-link brake control to make the best use of the converter. The controls of the rotor-side and the grid-side converters of the DFIG model are both well established and have been shown to work. Typically the crowbar protection is designed in order to protect the rotor-side converter and the power electronic components of the DFIG system from high currents occurring in the rotor due to the faults. The DC-link brake-overvoltage protection is also designed to prevent the overcharging of the DC-link capacitor placed between the rotor-side converter and the grid-side converter. In order to show that these protection schemes work and with thought can co-ordinate with each other, tests consisting of a number of balanced three-, two- and one-phase voltage sags are applied to the network voltage. The main contributions of this thesis are establishing operational tuning and design limits for the controllers and system subassemblies. This is to minimise the electrical subsystem interaction while maintaining adequate performance, and have an improved DC-link control. This work also includes a full electrical system study of the wind turbine and an essential literature review on significant references in the field of the DFIG wind turbine system modelling, control and protection. Specifically this research project makes a number of novel contributions to the literature: enhanced DC voltage control including operating point sensitivity analysis and dynamic stiffness assessment, sensitivity and robustness analyses of the power loop control and control loop segmentation by appropriately tuning the controller loops.

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Capitoli di libri sul tema "DC robustness"

1

Elhajji, Zina, Kadija Dehri, Zyad Bouchama, Ahmed Said Nouri e Najib Essounbouli. "Robustness Analysis of a Discrete Integral Sliding Mode Controller for DC-DC Buck Converter Using Input-Output Measurement". In Advances in Robust Control and Applications, 273–84. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-3463-8_11.

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2

Marhraoui, Saloua, Ahmed Abbou, Zineb Cabrane e Salahddine Krit. "Sliding Mode Control for PV Grid-Connected System With Energy Storage". In Research Anthology on Smart Grid and Microgrid Development, 607–34. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-6684-3666-0.ch027.

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We need to solve the problem due to the nonlinearity and power fluctuation in the photovoltaic (PV) connected storage system and grid; for that, the authors develop an algorithm to obtain the maximum power point tracking (MPPT) via control of the duty cycle of DC/DC boost converter. Consequently, they design an MPPT based on the second-order sliding mode control. Next, generating the law control founded on the Lyapunov theory can augment the robustness and stability of the PV connected grid. Then, they add a battery energy storage system (BESS) with a control management algorithm in the DC/DC side to eliminate any fluctuation of the output power of the PV system because of the temperature and irradiation variation. On the grid side, they control the DC/AC inverter side by the three-phase voltage source inverter control (VSIC) as a charge controller for the grid parameters.

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Marhraoui, Saloua, Ahmed Abbou, Zineb Cabrane e Salahddine Krit. "Sliding Mode Control for PV Grid-Connected System With Energy Storage". In Sensor Network Methodologies for Smart Applications, 168–99. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-4381-8.ch008.

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We need to solve the problem due to the nonlinearity and power fluctuation in the photovoltaic (PV) connected storage system and grid; for that, the authors develop an algorithm to obtain the maximum power point tracking (MPPT) via control of the duty cycle of DC/DC boost converter. Consequently, they design an MPPT based on the second-order sliding mode control. Next, generating the law control founded on the Lyapunov theory can augment the robustness and stability of the PV connected grid. Then, they add a battery energy storage system (BESS) with a control management algorithm in the DC/DC side to eliminate any fluctuation of the output power of the PV system because of the temperature and irradiation variation. On the grid side, they control the DC/AC inverter side by the three-phase voltage source inverter control (VSIC) as a charge controller for the grid parameters.

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4

Natsheh, Ammar, Thanh Hai Nguyen e Preetha Sreekumar. "Experimental Study of Parallel-Connected DC-DC Buck-Boost Converters FPGA Chaos Controlled". In Chronicle of Computing. Oklahoma International Publishing, 2024. http://dx.doi.org/10.55432/978-1-6692-0007-9_11.

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Chaos control is used to design a controller that is able to eliminate the chaotic behavior of nonlinear dynamic systems that experience such phenomena. This paper discuss the use of the FPGA as a controller of a parallel-connected DC-DC buck-boost converter, the goal of this paper is to build a controller that is capable of controlling the output current of a photovoltaic cells and minimize the effect of the module buck-boost converter chaotic behavior on the output voltage. To achieve this goal this paper presents two different methods, FPGA control the duty cycle and the frequency of the output controlling signal, this technique is done through software (FPGA code), and a delayed feedback control scheme in a module converter in the continuous-current conduction mode (CCM) using MATLAB/SIMULINK simulation. Thus, this paper shows the FPGA capabilities in the power industry and it’s specifies a guideline to overcome some of the obstacles when dealing with an FPGA as a buck-boost converter controller, and MATLAB/SIMULINK simulation results show the effectiveness and robustness of the scheme.

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5

Kumar, R. Tharwin, Riyaz A Rahiman, E. Immanuvelbright e K. S. Kavin. "DESIGN OF PMBLDC MOTOR FOR HIGH-SPEED ELECTRICAL APPLICATION". In Futuristic Trends in Electrical Engineering Volume 3 Book 1, 38–52. Iterative International Publishers, Selfypage Developers Pvt Ltd, 2024. http://dx.doi.org/10.58532/v3bdee1p2ch2.

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The use of renewable energy sources as the primary source has been made possible by recent advancements on a worldwide scale. There are many other renewable energy options, but the photovoltaic system seems to have the most promise. Due to its environmental friendliness, this is the case.The PV fed Permanent Synchronous Brushless DC motor (PMBLDC) for highspeed application is presented in this system. However, PV is beneficial for wide range of applications, the output obtained from PV is low due to varying climatic factors. For increasing the voltage to a higher range, it is necessary to utilise a DC-DC converter. In this study, the enhanced CUK converter is combined with an ANFIS controller to produce stable output voltage to power the motor.The stabilized output voltage is subsequently delivered to 3φ VSI, which is in charge of directly powering the PMBLDC motor. Furthermore, perfect control of the inverter's frequency and voltage allows for accurate PMBLDC motor speed regulation, which is performed by comparing the reference speed with the actual motor speed using a PI controller. In addition to this, the LC filter is positioned within the PV and the inverter that assist to reduce the current and voltage fluctuation and consequently, the input feed to the inverter is smoothed. The results of a detailed simulation of the suggested technique using MATLAB reveal remarkable reliability and robustness, demonstrating the effectiveness and practicality for PV supplied PMBLDC motor drive.

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6

R. García-Martínez, José, Edson E. Cruz-Miguel, Juvenal Rodríguez-Reséndiz, Luis D. Ramírez-González e Miguel A. Rojas-Hernández. "PID-like Fuzzy Controller Design for Anti-Slip System in Quarter-Car Robot". In Artificial Intelligence. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.110497.

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The design strategy of an adaptive Proportional-Integral-Derivative (PID)-like fuzzy controller for an anti-slip Quarter-Car robotic system is proposed. The proposed control system is constructed by two loops, an external one for lineal speed control and an internal loop for current control. A motion profile is used to follow a trajectory. The slip is computed, such as the difference between the linear velocity given by an S-curve velocity profile and the longitudinal speed calculated according to the rotational speed of the Quarter-Car tire. This difference is the input of the external control loop. Whether the slip is significant, the slave controller must do that both velocities go at the same speed controlling the current of the direct current (DC) motor. On the other hand, the mathematical model of a tire coupled to the DC-motor model is presented to simulate the system and controller response. To test the robustness of the system, different scenarios are presented where the slip coefficient varies depending on the work surface. Three surfaces were selected to test the performance of the controller, dry, wet, and icy surfaces, while the system had a trajectory.

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7

Karthik, L. Arun, K. Yaswanth Phani Durga, G. Naga Vyshnav e M. Sasi Deepa. "ENHANCING LOAD FREQUENCY CONTROL IN DUAL AREA HYDRO-THERMAL SYSTEMS WITH FRUIT FLY ALGORITHM TUNED PIDD CONTROLLER AND HVDC INTEGRATION". In Futuristic Trends in Renewable & Sustainable Energy Volume 3 Book 4, 145–56. Iterative International Publishers, Selfypage Developers Pvt Ltd, 2024. http://dx.doi.org/10.58532/v3bars4p3ch6.

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In this work, the load frequency control (LFC) of dual area conventional hydro thermal (DACHT) system is enforced under the control of fruit fly algorithm (FFA) tuned Proportional-Integral-Double derivative (PIDD) controller. Initially, the DACHT is laid with 1% step load perturbation (SLP) in area-1 to analyse its dynamic behaviour. However, the performance superiority of the FFA is validated with the artificial field algorithm (AFA), krill herd optimizer (KHO) and particle swarm optimisation. Further, the DACTH dynamic behaviour is assessed with the enforcement of high voltage DC line as the tie-line. Simulation results revealed the improvement of the system performance with the HVDC line. Finally, the DACTH is subjected with different loadings to test the robustness of the suggested control strategy

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Muthamizhan, T., D. Silas Stephen e A. Sivakumar. "ANFIS Controller Based Speed Control of High-Speed BLDC Motor Drive". In Intelligent Systems and Computer Technology. IOS Press, 2020. http://dx.doi.org/10.3233/apc200164.

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The paper aims to define the speed control of Brushless DC Motor (BLDC) drive using an Adaptive Neuro Fuzzy Interface System (ANFIS) controller. ANFIS controller-based switching scheme reduces the power quality issues present in the system by minimizing the Total Harmonic Distortion (THD). Incremental conductance algorithm-based control technique for the Maximum Power Point Tracking (MPPT) in variable solar irradiation conditions for photovoltaic (PV) system is proposed. INC algorithm are used to operate the photovoltaic panels at maximum power, by generating PWM pulse to control the flyback converters in differential power processing mode. BLDC motor drive is electronically commutated by means of switching logical pulses from the rotor position sensor using PI controllers. The simulation shows the significance and robustness of BLDC drive and the results offered illustrates the intended control is effective, with fast responseandminimum settling times.

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Chiheb, Sofiane, Badri Rekik, Tarek Messikh, Abdelhak Djellad, Nacer Bouderres, Omar Kherif, Aicha Chibane e Abir Djendli. "Impact of DC Filters Energies on the Commutation Failure in HVDC CIGRE Benchmark". In Advances in Transdisciplinary Engineering. IOS Press, 2023. http://dx.doi.org/10.3233/atde230535.

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The present work is devoted to study and simulate of the functioning of monopolar HVDC LCC system of 500 kV in the presence of an AC power grids voltage disturbance. The CIGRE HVDC LCC Benchmark was simulated using MATLAB/Simulink in presence of AC grids voltage variations: first an overvoltage in AC grid 1 and second voltage drop in AC grid 2 have been simulated. All of these simulations are done to evaluate the robustness of the CIGRE HVDC LCC benchmark against AC grids voltage variation, and to investigate the ability of HVDC link function after disappearing of the simulated variation. The results showed that the HVDC LCC system is sensitive to overvoltage higher than 15 % appearing at the rectifier level, and is sensible too to voltage drops with more than 10 % at the invert level. In these conditions, a commutation failure leading to short-circuit was observed, which interrupt the HVDC link operation, and doesn’t permit re-establishment of link function after fault disappearing. To find the reason of the commutation failure appearing, the magnetic and electrostatic energies stored in DC filter elements have been measured and analyzed. The analysis show that when the magnetic energy is greater than the electrostatic one, the commutation failure appears.

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Singh, Balvender, e Shree Krishan Bishnoi. "An Application of ANFIS-PID Controller for Multi Area Hybrid Power System". In Artificial Intelligence and Communication Technologies, 613–27. 2022^a ed. Soft Computing Research Society, 2022. http://dx.doi.org/10.52458/978-81-955020-5-9-59.

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In this work adaptive fuzzy- PID (ANFIS-PID) controller is presented for frequency and tie-line regulation of multi-area interconnected power systems (IPS). The proposed controller has the properties of both neural network and fuzzy logic. A novel four area power system comprises two reheat turbines (area1 and area2), one hydropower plant (area 3) with the hydraulic governor and one wind plant (area 4) with a pitch actuator. This hybrid interconnected power system model has been built in MATLAB/ Simulink version 2020(a) and the proposed controller is employed with the same design of ANFIS model in all areas. Further, the performance of power system model is presented with the suggested controller. The step load change is considered in each area. An HVDC lines are considered in each area to improve the performance of the proposed model. Further, a fair comparison is made for the conventional PID and Fuzzy-PID controllers. The designed controller performs best compared to the other compared controller for tie-line power and frequency regulation in all four areas of the IPS. The dynamic response of the proposed model improves with AC/DC line as compared to AC line. The sensitivity analysis with change in plant parameters, step load perturbation (SLP) and random load change is also being applied to check the robustness of the controller.

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Atti di convegni sul tema "DC robustness"

1

Pagano, D. J., e E. Ponce. "On the robustness of the DC-DC boost converter under washout SMC". In 2009 Brazilian Power Electronics Conference (COBEP). IEEE, 2009. http://dx.doi.org/10.1109/cobep.2009.5347639.

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Ammar, Imen Iben, Moustapha Doumiati, Sarah Kassir, Mohamed Machmoum e Mohamed Chaabane. "Polynomial Lyapunov control for DC MicroGrid robustness and stability". In IECON 2022 – 48th Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2022. http://dx.doi.org/10.1109/iecon49645.2022.9968840.

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3

Yang, Tianxiao, Chenggang Cui e Chuanlin Zhang. "On the Robustness Enhancement of DRL Controller for DC-DC Converters in Practical Applications". In 2022 IEEE 17th International Conference on Control & Automation (ICCA). IEEE, 2022. http://dx.doi.org/10.1109/icca54724.2022.9831887.

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4

Jin, Shudan, Shengrong Zhuo e Yigeng Huangfu. "Design of ADRC Based on Improved ESO for Enhanced Robustness of Bidirectional DC/DC Converters in DC Microgrid". In IECON 2023- 49th Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2023. http://dx.doi.org/10.1109/iecon51785.2023.10311645.

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Sumsurooah, Sharmila, Serhiy Bozhko, Milijana Odavic e Dushan Boroyevich. "Stability and robustness analysis of a DC/DC power conversion system under operating conditions uncertainties". In IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2015. http://dx.doi.org/10.1109/iecon.2015.7392577.

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6

Alyaqout, Sulaiman F., Panos Y. Papalambros e A. Galip Ulsoy. "Combined Robust Design and Robust Control of an Electric DC Motor". In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-16027.

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Abstract (sommario):

System performance can significantly benefit from optimally integrating the design and control of engineering systems. To improve the robustness properties of systems, the present article introduces an approach that combines robust design with robust control and investigates the coupling between them. However, the computational cost of improving this robustness can often be high due to the need to solve a resulting minimax design and control optimization problem. To reduce this cost, sequential and iterative strategies are proposed and compared to an all-in-one strategy for solving the minimax problem. These strategies are then illustrated for a case-study: Robust design and robust control of a DC motor. Results show that the resulting strategies can improve the robustness properties of the DC motor. In addition, the coupling strength between robust design and robust control tends to increase as the applied level of uncertainty increases.

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He, Huang, Alexandre Boyer e Sonia Ben Dhia. "Passive device degradation models for an electromagnetic emission robustness study of a buck DC-DC converter". In 2015 IEEE International Symposium on Electromagnetic Compatibility (EMC). IEEE, 2015. http://dx.doi.org/10.1109/isemc.2015.7256359.

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Nihei, Shigeki, Masahiro Umehira e Shigeki Takeda. "A Modified DFTs-OFDM with DC Subcarrier Shift for Low PAPR and DC Offset Error Robustness". In 2015 IEEE 81st Vehicular Technology Conference (VTC Spring). IEEE, 2015. http://dx.doi.org/10.1109/vtcspring.2015.7145623.

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9

Reitz, Max A., e Xin Wang. "Robust Sliding Mode Control of Buck-Boost DC-DC Converters". In ASME 2016 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/dscc2016-9804.

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Abstract (sommario):

DC-DC converters are an efficient way to convert a source voltage from one to level to another and have found extensive applications in many areas such as portable electronics, solar and wind energy systems. This paper presents a comparison of first order and higher order sliding mode control of buck-boost converters. Sliding mode control is ideal for controlling non-linear systems like switched voltage regulators as a result of its robustness to internal parameter uncertainties and external disturbances. First order sliding mode control is subject to a phenomenon known as chattering, which causes an undesirable oscillation about the desired output. Computer simulation studies are presented and show that the higher order controller reduces this problem.

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Wu, Wei, Xin Wang e Andy G. Lozowski. "A Novel Digital Speed Control Design for Brushless DC Motor Drives". In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70667.

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Abstract (sommario):

This paper presents a novel robust digital speed control design for brushless DC motors (BLDCs). The speed control can be achieved by regulating the DC link voltage of a six-step inverter. The discrete-time brushless DC motor dynamics is derived through bilinear transform. A robust digital control algorithm is designed to guarantee the closed loop system stability by satisfying the desired phase and gain margin. Computer numerical simulation studies and hardware implementation have demonstrated the effectiveness and robustness of the proposed scheme.

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