Готові списки джерел за темами / Active compensation

Добірка наукової літератури з теми "Active compensation"

Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Active compensation"

1

Ginn, Herbert L., and Guangda Chen. "Flexible Active Compensator Control for Variable Compensation Objectives." IEEE Transactions on Power Electronics 23, no. 6 (November 2008): 2931–41. http://dx.doi.org/10.1109/tpel.2008.2005385.

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2

Tępiński, Jarosław. "Converter Compensation of Reactive Power Consumed by the Induction Generato." Safety & Fire Technology 57, no. 1 (2021): 64–79. http://dx.doi.org/10.12845/sft.57.1.2021.5.

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Purpose: The purpose of the article is to present a reactive power compensation for small hydropower plants with an induction generator. The classic compensation with capacitors is discussed and its improvement is proposed. Instead of capacitors, a three level power electronic converter connected in parallel to the induction generator can be used to provide reactive power compensation. The purpose of the paper is to present the developed structure of an active compensator and its control method. The developed control method was verified on a laboratory stand. The project and the methods: As part of research, an active compensator was built as a three-level power electronic converter in topology with Neutral Point Clamped. Laboratory tests of a converter compensator were carried out on a stand equipped with an induction generator with a power of 7.5 kW. Laboratory system measurements were made using a power analyzer and an oscilloscope. Results: A control structure of an active compensator based on a voltage-oriented method was presented and discussed. The operation of the con- verter compensator has been verified on a laboratory stand equipped with a 7.5 kW induction generator. The compensator current reduces the reactive (inductive) component of the current consumed from a power grid to a value equal to zero. The reactive power compensator ensures that the tgφ power factor is maintained at a set value of zero, which corresponds to the total compensation of inductive reactive power consumed by an induction generator working in a hydropower plant. Operation of the active compensator did not cause a significant increase in the harmonic content in the current consumed from the power grid. Conclusions: The paper presents the issues regarding reactive power compensation in hydropower plants with induction generators. Commonly used capacitor compensation has been covered and as a result, it is proposed to replace it with power electronics converter compensation of reactive power connected in parallel induction generators. Active compensator provides compensation for the entire reactive power consumed by the induction generator. The use of the converter compensator of reactive power significantly contributes to the reduction of costs for reactive power incurred by the owners of hydropower plants. The reactive power compensator also has a positive impact on the operation of the entire power grid, power losses from the reactive component of the current on the impedances of power grid components are limited. Keywords: renewable source of electricity, reactive power, active compensator, induction generator Type of article: original scientific article
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3

Fatyga, Karol, and Dariusz Zieliński. "Sensorless Current Pulsation Compensation in a Hybrid Energy Storage." Applied Sciences 13, no. 4 (February 9, 2023): 2252. http://dx.doi.org/10.3390/app13042252.

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This paper presents a dual active bridge DC/DC converter used as an AC current compensator in a hybrid energy storage application. The AC current in the DC link appears when a three-phase, four-wire inverter operates with unbalanced output currents—for example, when trying to compensate for grid voltage unbalance. This AC current has adverse effects on the operation of the electrochemical energy storage, and it should be compensated. To achieve this, a compensator is introduced into the DC link circuit of the inverter—a DC/DC converter with a capacitor bank. The DC/DC converter is responsible for compensating the AC pulsation by creating its own pulsation with the opposite phase. In the paper, the genesis of this pulsation is explained, and a compensation circuit is proposed along with a sensorless compensation algorithm. The algorithm is based on symmetrical decomposition and is used to generate a reference signal for the compensator. The numerical analysis of the algorithm is presented, and the operation of the compensator is verified on the laboratory bench.
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4

Wang, Dazhi, Tianqing Yuan, Xingyu Wang, Xinghua Wang, and Wenhui Li. "A Composite Vectors Modulation Strategy for PMSM DTC Systems." Energies 11, no. 10 (October 12, 2018): 2729. http://dx.doi.org/10.3390/en11102729.

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The operation performance of permanent magnet synchronous motors (PMSMs) driven by direct torque control (DTC) are affected by torque error compensation and flux error compensation in each control period. The error compensational effects provided by different vectors under different control strategies are analyzed in this paper. The precondition of accurate error compensation is applied to the proposed novel composite vectors modulation strategy (CVM) for a PMSM DTC system. In CVM-DTC, the operating conditions of PMSM are divided into three cases according to the relationships between the errors and the actual error compensations, including steady-state case, dynamic-state case, and transient-state case. In order to establish the novel CVM-DTC strategy smoothly, the effect factors are introduced and used to represent the error compensational effects, which are obtained through the proposed effect factors’ controller. The analysis of error compensational effects provided by single active vector and synthetic voltage vector are described in detail while the PMSM is operated in different operation conditions. Finally, the effectiveness of the novel CVM-DTC strategy is verified through the experimental results in a 100-W PMSM drive system.
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5

Mullen, Anne. "Passive consumption or active compensation." Nature Food 3, no. 5 (May 2022): 305. http://dx.doi.org/10.1038/s43016-022-00528-5.

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6

Makris, C. A., and C. Toumazou. "Current-mode active compensation techniques." Electronics Letters 26, no. 21 (1990): 1792. http://dx.doi.org/10.1049/el:19901148.

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7

Brecher, C., D. Manoharan, and W. Klein. "Active compensation for portal machines." Production Engineering 4, no. 2-3 (March 6, 2010): 255–60. http://dx.doi.org/10.1007/s11740-010-0212-y.

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Demirdelen, T., R. I. Kayaalp, and M. Tumay. "A Modular Cascaded Multilevel Inverter Based Shunt Hybrid Active Power Filter for Selective Harmonic and Reactive Power Compensation Under Distorted/Unbalanced Grid Voltage Conditions." Engineering, Technology & Applied Science Research 6, no. 5 (October 23, 2016): 1133–38. http://dx.doi.org/10.48084/etasr.777.

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In recent years, shunt hybrid active power filters are being increasingly considered as a viable alternative to both passive filters and active power filters for compensating harmonics. In literature, their applications are restricted to balanced systems and low voltage applications and therefore not for industrial applications. This paper investigates the performance of a modular cascaded multilevel inverter based Shunt Hybrid Active Power Filter (SHAPF) for reactive power compensation and selective harmonics elimination under distorted/unbalanced grid voltage conditions in medium voltage levels. In the proposed control method, reactive power compensation is achieved successfully with a perceptible amount and the performance results of harmonic compensation are satisfactory. Theoretical analysis and simulation results are obtained from an actual industrial network model in PSCAD. The simulation results are presented for a proposed system in order to demonstrate that the harmonic compensation performance meets the IEEE-519 standard.
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9

Ma, You Jie, Min Pan, and Xue Song Zhou. "Overview on Control Methods of Active Power Filter." Advanced Materials Research 749 (August 2013): 610–13. http://dx.doi.org/10.4028/www.scientific.net/amr.749.610.

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Анотація:
With the wide application of power electronic devices, especially the use of non-linear device, a large number of harmonics and reactive current injected into the grid, which will cause power grid pollution, and the power quality problems have become increasingly serious .Active Power Filter (APF) is an important device for the power system harmonics and reactive power compensating. The real-time control and accuracy is a key to achieving effective compensation. Several suitable for active power filters basic principle of the compensation current control strategy is introduced in this paper, the paper carries on the contrast analysis, and points out the advantages and disadvantages of each, The development of the control strategy of the active filter can achieve a better performance and a wider range of application.
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10

Liu, Nixuan, Siqi Cao, and Juntao Fei. "Fractional-Order PID Controller for Active Power Filter Using Active Disturbance Rejection Control." Mathematical Problems in Engineering 2019 (July 1, 2019): 1–10. http://dx.doi.org/10.1155/2019/6907570.

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This paper proposed a fractional-order PID controller and active disturbance rejection control (ADRC) method for the current compensation of active power filter (APF). The control method consists of two closed loops. One is a reference current tracking loop based on the ADRC controller, which can treat the internal and external uncertainties of the system as a whole. The other is the voltage control loop with the fractional-order PID controller for more flexibility. Simulation results demonstrate that the proposed control method has a stronger robustness and higher compensating precision comparing with the double-loop PID control method.
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Дисертації з теми "Active compensation"

1

Müller, Jonas [Verfasser]. "Active Toe-Angle Compensation / Jonas Müller." München : Verlag Dr. Hut, 2013. http://d-nb.info/1035049937/34.

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2

Bush, Robert Walton. "Design of an active acceleration compensation robot." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/19314.

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3

Anwar, Saeed. "Active Power Compensation of Microgrid Connected Systems." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1406653103.

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Carpenter, Paul Andrew. "Active filter current compensation for transmission optimisation." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/24291.

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This dissertation is based on the fact that any m-wire electrical system can be modelled as m-equivalent Thevenin voltages and impedances when viewed from any node. The dissertation describes how to calculate the optimal distribution of currents, so a specific amount of power can flow through and reach the network equivalent Thevenin voltages with minimal losses. The optimal current distribution method uses a recently patented method which calculates the optimal currents for each of the wires which are shown to be obtained from the Thevenin parameters and power flow at any instant in time at any node. Once the ideal currents are found, these can be obtained by active and passive devices to inject a specific amount of power (positive and negative) as to compensate existing currents. The focus is particularly on the proof of concept by simulations and physical experiments with work not specifically described in the patent with more emphasis on the optimisation to active compensation. It is explained and shown how this can be implemented using the Malengret and Gaunt method. This method reduces the cost in application where not all the currents need to be processed through a converter (e.g. inverter) but only the difference between the existing and desired optimal currents. A smaller shunt parallel converter can result with ideal current flow without the need for interrupting the currents as described in the present patent. The methodology is explained and demonstrated by simulation.
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5

Decker, Michael Wilhelm. "Active acceleration compensation for transport of delicate objects." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/21258.

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6

Pinfold, W. R. "An active motion compensation system using multiple bodies." Thesis, University of Strathclyde, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381330.

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7

Pomierski, Wojciech. "Position signal filtering for hydraulic active heave compensation system." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71095.

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In the paper a new position signal filtering method with position prediction is presented along with test results using a simulation tool. The complete active heave compensation system performance with input signal filtering is also shown. The control system uses an input acceleration signal taken from the motion reference unit, which usually contains noise that is not acceptable for the position controller. Currently, a Kalman filter is used which is okay to use for certain conditions. The filter works similarly to how it is used for autonomous applications where two input positions are necessary, one from position sensors and another one taken from the model. The challenge is that there is no physical wave model available for the Kalman filter used for offshore position control and the waves are not predictable. It was found that a Kalman filter with a special signal prediction instead of the model input can be used. This position prediction helps to avoid system delays and the potential of missing the signal for a short period of the time.
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8

Granjon, Pierre. "Contribution à la compensation active des vibrations des machines électriques." Phd thesis, Grenoble INPG, 2000. http://tel.archives-ouvertes.fr/tel-00101286.

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Ce travail de recherche est consacré à l'élaboration d'une méthode de compensation active des vibrations d'une machine tournante électrique. Son originalité tient au fait que les enroulements statoriques sont alimentés par
des courants de commande additionnels afin d'engendrer des forces radiales sur le stator. Celui-ci répond alors par des vibrations additionnelles qui interagissent avec les vibrations naturelles de la machine. Le but de ce
système de contrôle actif est donc de calculer la valeur ”optimale” de ces courants, permettant de minimiser la puissance des signaux vibratoires au niveau de capteurs accéléromètriques fixés à la périphérie du stator.
Dans un premier temps, la modélisation du transfert situé entre les commandes et les contre-vibrations engendrées conduit à un système linéaire et variant périodiquement dans le temps (LVPT). La fréquence fondamentale de ses variations est alors proportionnelle à la fréquence de rotation de la machine.
Après avoir montré l'insuffisance des méthodes classiques de contrôle actif pour cette application, une étude théorique détaillée des systèmes LVPT est réalisée. Elle conduit à la définition d'une matrice de transfert, jouant le même rôle que la fonction de transfert classique employée pour les systèmes linéaires et invariants dans le temps. Cette matrice permet d'écrire simplement la relation entre les entrées et les sorties du système
considéré dans le domaine fréquentiel.
Finalement, les résultats précédents sont utilisés afin de déterminer l'expression optimale des courants de commande minimisant la puissance des signaux de vibrations mesurés. Un algorithme récursif permet également de converger vers cet optimum, et de prendre en compte d'éventuelles variations des perturbations vibratoires à éliminer. Divers résultats, obtenus sur des signaux synthétiques puis sur des signaux vibratoires réels, illustrent les performances obtenues par ce système de contrôle actif. Il permet une réduction significative des vibrations
synchrones au phénomène de rotation, sans pour autant modifier les caractéristiques des autres. Enfin, son implantation en temps-réel dans un processeur numérique de traitement de signal est discutée et réalisée.
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9

Argillander, Joakim. "Active Phase Compensation in a Fiber-Optical Mach-Zehnder Interferometer." Thesis, Linköpings universitet, Informationskodning, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-166419.

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This thesis investigates the phenomena of phase stability in a fiber-optical MZI (Mach-Zehnder Interferometer). The MZI is a key building block of optical systems for use in experiments with both continuous-wave light and with single photons. By splitting incoming light into two beams and allowing it to interfere with itself, an interference pattern is visible at the output, and this phenomena can be used to code information. This is the operating principle in, for example, QKD (Quantum Key Distribution) experiments. This interference requires coherence that is higher than the length difference between the beams that the incoming light is split into. Particularly the phase of the beams must be equal to achieve constructive interference. If one beam is phase-shifted (with respect to the other) due to the light having traversed a longer path, only partially constructive interference is achieved. If the phase shift also varies with time this leads to a system where experiments can no longer reliably be performed. Sources of these fluctuations are thermal, acoustic or mechanical. Fiber-optical interferometers are particularly sensitive to path length fluctuations of the waveguides as the fiber-optic medium contracts and elongates with temperature, and also has a larger surface area for circulating air to mechanically disturb the waveguides than bulk optics interferometers. In this thesis, a solution to environment-induced phase drift is presented by evaluating implementations of feedback algorithms for automatic control. The algorithms PID (Proportional-, Integral-, Derivative controller) and an ICA (IncrementalControl Algorithm) have been investigated and the performance of these controllers has been compared when used with, and without, optical enclosures. The algorithms are implemented in an FPGA (Field-Programmable Gate Array) and the controller actuates an electro-optical phase modulator that can add a phase shift to one of the light beams in the MZI. This thesis shows that significant improvement in the optical stability can be achieved with active control compared to an interferometer without active phase control.
Det här examensarbetet undersöker fenomenet fasstabilitet i en fiber-optisk MZI (Mach-Zehnder-Interferometer). MZI:n är en viktig byggsten i optiska system som används till experiment med både kontinuerligt emitterande lasrar och med enskilda fotoner. Genom att dela upp inkommande ljus i två strålar och låta det interferera med sig själv så bildas ett interferensmöster vid utgången vilket kan användas för att koda information. Det här är huvudprincipen bakom, till exempel, experiment inom QKD (kvantnyckeldistribution, eng: Quantum Key Distribution). Denna interferens förutsätter en koherens (högre än längdskillnaden mellan strålarna) mellan strålarna som det inkommande ljuset är uppdelat i. Särskilt måste fasen hos de bägge strålarna vara lika för att åstadkomma fullständig konstruktiv intereferens. Om en stråle är fasförskjuten (i förhållande till den andra) på grund av att ljuset har färdats en längre sträcka så uppnås endast delvis konstruktiv interferens. Om fasförskjutningen även varierar med tiden så leder det till ett system där experiment inte längre kan pålitligt utföras. Sådana fluktuationer är orsakade av termiskt, akustiskt samt mekaniskt varierande effekter. Fiberoptiska interferometrar är särskilt känsliga mot förändringar i vågledarnas längd. Detta på grund av att det fiberoptiska mediet dras ihop respektive sträcks ut med temperaturen, samt att fibern har en större ytarea som cirkulerande luft kan påverka mekaniskt jämfört med interferometrar konstruerade av bulkoptik. I det här examensarbetet presenteras en lösning på problemet med miljöinducerad fasskift genom att utvärdera reglertekniska återkopplande algoritmer. Algoritmerna PID (Proportionell-, Integrerande-, Deriverande regulator) samt ICA (Inkrementell Regleralgoritm, eng: Incremental Control Algorithm) har undersökts och deras prestanda har jämförts med samt utan avskärmning. Algoritmerna har implementerats i en FPGA (fältprogrammerbar grindmatris, eng: Field-Programmable Gate Array) och regulatorn styr en elektrooptisk fasmodulator som kan addera en fasförskjutning till en av ljusstrålarna i MZI:n. Resultat visar att passiv avskärmning inte är tillräckligt utan behöver användas tillsammans med aktiv reglering för att uppnå stabilitet över en längre tidsperiod. Detta examensarbete visar på att en signifikant förbättring i den optiska stabiliteten kan uppnås med aktiv reglering jämfört med en interferometer utan aktiv fasreglering.
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10

Raju, N. Ravisekhar. "A decoupled converter topology for active compensation of power systems /." Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/5847.

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Книги з теми "Active compensation"

1

Glenn, Beheim, and United States. National Aeronautics and Space Administration., eds. Active phase compensation system for fiber optic holography. [Washington, D.C.?: National Aeronautics and Space Administration, 1988.

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2

United States. National Aeronautics and Space Administration., ed. Active feed array compensation for reflector antenna surface distortions. [Washington, D.C.]: National Aeronautics and Space Administration, 1988.

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3

Office, General Accounting. Military personnel: Active duty compensation and its tax treatment. Washington, DC: U.S. General Accounting Office, 2004.

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4

Ash, Beth J. A look at cash compensation for active duty military personnel. Santa Monica, CA: Rand, 2002.

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5

R, Acosta, and United States. National Aeronautics and Space Administration., eds. Case study of active array feed compensation with sidelobe control for reflector surface distortion. [Washington, D.C.]: National Aeronautics and Space Administration, 1988.

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6

Gold, Marsha R. Trends in medical coverage that active workers receive from employers: Implications for reforming the medicare benefit package. Washington D.C. (1730 K Street, NW, Washington, 20006): Medicare Payment Advisory Commission, 2002.

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7

Illinois. Dept. of Transportation. Wetlands Unit. Annual report for active IDOT wetland compensation and hydrologic monitoring sites, September 1, 2000 to September 1, 2001. Champaign, Ill: Illinois State Geological Survey, Wetlands Geology Section, 2001.

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8

Office, General Accounting. Defense budget: Trends in active military personnel compensation accounts for 1990-97 : report to the Chairman, Subcommittee on National Security, Committee on Appropriations, House of Representatives. Washington, D.C: The Office, 1996.

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9

United States. Congress. House. Committee on Post Office and Civil Service. Subcommittee on Compensation and Employee Benefits. Benefits available to federal employees called to active military duty: Hearing before the Subcommittee on Compensation and Employee Benefits of the Committee on Post Office and Civil Service, House of Representatives, One Hundred Second Congress, first session, May 15, 1991. Washington: U.S. G.P.O., 1991.

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10

(Jürgen), Schlabbach J., and Just Wolfgang, eds. Reactive power compensation: A practical guide. Chichester, West Sussex, U.K: Wiley, 2012.

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Частини книг з теми "Active compensation"

1

Landau, Ioan Doré, Tudor-Bogdan Airimitoaie, Abraham Castellanos-Silva, and Aurelian Constantinescu. "Adaptive Feedforward Compensation of Disturbances." In Adaptive and Robust Active Vibration Control, 311–49. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-41450-8_15.

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2

STOCKMAN, MARK I. "Spaser, Plasmonic Amplification, and Loss Compensation." In Active Plasmonics and Tuneable Plasmonic Metamaterials, 1–39. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118634394.ch1.

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3

Zhang, Bao-Lin, Qing-Long Han, Xian-Ming Zhang, and Gong-You Tang. "Optimal Tracking Control with Feedforward Compensation." In Active Control of Offshore Steel Jacket Platforms, 33–48. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2986-9_3.

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4

BERINI, PIERRE. "Loss Compensation and Amplification of Surface Plasmon Polaritons." In Active Plasmonics and Tuneable Plasmonic Metamaterials, 153–70. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118634394.ch5.

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Tamura, Tsutomu, Aris Maroonian, and Robert Fuchs. "Active Compensation of Friction in Electric Power Steering." In Lecture Notes in Electrical Engineering, 213–25. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33795-6_18.

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Chen, Yitong, and Wen Zhang. "Active Room Compensation for 2.5D Sound Field Reproduction." In Proceedings of the 8th Conference on Sound and Music Technology, 105–12. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-1649-5_9.

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7

Landau, Ioan Doré, Tudor-Bogdan Airimitoaie, Abraham Castellanos-Silva, and Aurelian Constantinescu. "Design of Linear Feedforward Compensation of Broad-band Disturbances from Data." In Adaptive and Robust Active Vibration Control, 295–310. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-41450-8_14.

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Li, Jia-Wang, Tong Ge, and Xu-Yang Wang. "Output Feedback Control for an Active Heave Compensation System." In Lecture Notes in Electrical Engineering, 811–20. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1839-5_87.

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Zhao, Yun-Bo, Guo-Ping Liu, Yu Kang, and Li Yu. "Active Compensation for Data Packet Disorder in Networked Control Systems." In Packet-Based Control for Networked Control Systems, 117–26. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-6250-6_9.

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Kushnirenko, Roman, Svitlana Alkhimova, Dmytro Sydorenko, and Igor Tolmachov. "Active Stylus Input Latency Compensation on Touch Screen Mobile Devices." In Communications in Computer and Information Science, 245–53. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-50726-8_32.

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Тези доповідей конференцій з теми "Active compensation"

1

Sozanski, Krzysztof Piotr. "Improved shunt active power filters." In 2008 International School on Nonsinusoidal Currents and Compensation (ISNCC). IEEE, 2008. http://dx.doi.org/10.1109/isncc.2008.4627513.

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Gwozdz, Michal. "Power electronics active filter with controlled dynamics." In 2008 International School on Nonsinusoidal Currents and Compensation (ISNCC). IEEE, 2008. http://dx.doi.org/10.1109/isncc.2008.4627516.

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3

Mansell, Justin D., Supriyo Sinha, Eric K. Gustafson, Martin M. Fejer, and Robert L. Byer. "Active Laser Amplifier Distortion Compensation." In Advanced Solid State Lasers. Washington, D.C.: OSA, 2001. http://dx.doi.org/10.1364/assl.2001.pd4.

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4

Hardy, John W., and Edward P. Wallner. "Wavefront compensation using active lenses." In 1994 Symposium on Astronomical Telescopes & Instrumentation for the 21st Century, edited by Mark A. Ealey and Fritz Merkle. SPIE, 1994. http://dx.doi.org/10.1117/12.176091.

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5

Cuellar, William H., and Eugenio Fortaleza. "Semi-Active Hydropneumatic Heave Compensator." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23564.

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A hydropneumatic heave compensation system and a semi-active control are proposed according to the requirements drilling offshore of 6 km deep. The goal of this semi-active control is to maintain an acceptable performance of the system when the drill string mass changes, which also changes the performance of the hydropneumatic system. The control action is executed just by a servo valve, which modifies the system damping to optimize the compensator performance. This servo valve is the only moving part of the control system and therefore, this system is more robust regarding mechanical/ electrical failures and it has low consumption energy. The results show a satisfactory frequency response of semi-active control when the drill string mass is changed.
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6

Strzelecki, R., and M. Wojciechowski. "New control system of the shunt active power filter." In 2008 International School on Nonsinusoidal Currents and Compensation (ISNCC). IEEE, 2008. http://dx.doi.org/10.1109/isncc.2008.4627518.

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7

Heising, C., M. Oettmeier, and V. Staudt. "Pole-restraining control of three-phase Active Front End." In 2010 International School on Nonsinusoidal Currents and Compensation (ISNCC). IEEE, 2010. http://dx.doi.org/10.1109/isncc.2010.5524507.

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8

Bartelt, Roman, Martin Oettmeier, Carsten Heising, and Volker Staudt. "Flux-based control of 3-phase Active Front End." In 2010 International School on Nonsinusoidal Currents and Compensation (ISNCC). IEEE, 2010. http://dx.doi.org/10.1109/isncc.2010.5524523.

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9

Suru, Constantin Vlad, Alexandra Patrascu, and Mihaita Linca. "Conservative power theory implementation in shunt active power filtering." In 2013 International School on Nonsinusoidal Currents and Compensation (ISNCC). IEEE, 2013. http://dx.doi.org/10.1109/isncc.2013.6604450.

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10

Czarnecki, Leszek S., and Tracy N. Toups. "Working and reflected active powers of three-phase loads." In 2015 International School on Nonsinusoidal Currents and Compensation (ISNCC). IEEE, 2015. http://dx.doi.org/10.1109/isncc.2015.7174698.

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Звіти організацій з теми "Active compensation"

1

Einstein-Curtis, Joshua A. Microphonics and Active Compensation. Office of Scientific and Technical Information (OSTI), October 2017. http://dx.doi.org/10.2172/1460386.

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Clark, Brian F., Brett E. Bagwell, and David Victor Wick. Radical advancement in multi-spectral imaging for autonomous vehicles (UAVs, UGVs, and UUVs) using active compensation. Office of Scientific and Technical Information (OSTI), January 2007. http://dx.doi.org/10.2172/902558.

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3

Schneider, Jason, and Neil Ebuen. The Potential Effects of the Defense Business Board Military Compensation Task Group's 2011 Recommendations on Active-Duty Service Member Retirement. Fort Belvoir, VA: Defense Technical Information Center, December 2012. http://dx.doi.org/10.21236/ada576488.

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4

Whelan, G., K. E. Hartz, and N. D. Hilliard. Remedial Action Assessment System (RAAS): Evaluation of selected feasibility studies of CERCLA (Comprehensive Environmental Response, Compensation, and Liability Act) hazardous waste sites. Office of Scientific and Technical Information (OSTI), April 1990. http://dx.doi.org/10.2172/6988166.

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5

Samach, Alon, Douglas Cook, and Jaime Kigel. Molecular mechanisms of plant reproductive adaptation to aridity gradients. United States Department of Agriculture, January 2008. http://dx.doi.org/10.32747/2008.7696513.bard.

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Annual plants have developed a range of different mechanisms to avoid flowering (exposure of reproductive organs to the environment) under adverse environmental conditions. Seasonal environmental events such as gradual changes in day length and temperature affect the timing of transition to flowering in many annual and perennial plants. Research in Arabidopsis and additional species suggest that some environmental signals converge on transcriptional regulation of common floral integrators such as FLOWERING LOCUS T (FT). Here we studied environmental induction of flowering in the model legume Medicago truncatula. Similarly to Arabidopsis, the transition to flowering in M. truncatula is hastened by long photoperiods and long periods of vernalization (4°C for 2-3 weeks). Ecotypes collected in Israel retain a vernalization response even though winter temperatures are way above 4°C. Here we show that this species is also highly responsive (flowers earlier) to mild ambient temperatures up to 19°C simulating winter conditions in its natural habitat. Physiological experiments allowed us to time the transition to flowering due to low temperatures, and to compare it to vernalization. We have made use of natural variation, and induced mutants to identify key genes involved in this process, and we provide here data suggesting that an FT gene in M.truncatula is transcriptionally regulated by different environmental cues. Flowering time was found to be correlated with MtFTA and MtFTB expression levels. Mutation in the MtFTA gene showed a late flowering phenotype, while over-expressing MtFTA in Arabidopsis complemented the ft- phenotype. We found that combination of 4°C and 12°C resulted in a synergistic increase in MtFTB expression, while combining 4°C and long photoperiods caused a synergistic increase in MtFTA expression. These results suggest that the two vernalization temperatures work through distinct mechanisms. The early flowering kalil mutant expressed higher levels of MtFTA and not MtFTB suggesting that the KALIL protein represses MtFTA specifically. The desert ecotype Sde Boker flowers earlier in response to short treatments of 8-12oc vernalization and expresses higher levels of MtFTA. This suggests a possible mechanism this desert ecotype developed to flower as fast as possible and finish its growth cycle before the dry period. MtFTA and FT expression are induced by common environmental cues in each species, and expression is repressed under short days. Replacing FT with the MtFTA gene (including regulatory elements) caused high MtFTA expression and early flowering under short days suggesting that the mechanism used to repress flowering under short days has diversified between the two species.The circadian regulated gene, GIGANTEA (GI) encodes a unique protein in Arabidopsis that is involved in flowering mechanism. In this research we characterized how the expression of the M.truncatula GI ortholog is regulated by light and temperature in comparison to its regulation in Arabidopsis. In Arabidopsis GI was found to be involved in temperature compensation to the clock. In addition, GI was found to be involved in mediating the effect of temperature on flowering time. We tested the influence of cold temperature on the MtGI gene in M.truncatula and found correlation between MtGI levels and extended periods of 12°C treatment. MtGI elevation that was found mostly after plants were removed from the cold influence preceded the induction of MtFT expression. This data suggests that MtGI might be involved in 12°C cold perception with respect to flowering in M.truncatula. GI seems to integrate diverse environmental inputs and translates them to the proper physiological and developmental outputs, acting through several different pathways. These research enabled to correlate between temperature and circadian clock in M.truncatula and achieved a better understanding of the flowering mechanism of this species.
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Event-Triggered Adaptive Robust Control for Lateral Stability of Steer-by-Wire Vehicles with Abrupt Nonlinear Faults. SAE International, July 2022. http://dx.doi.org/10.4271/2022-01-5056.

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Because autonomous vehicles (AVs) equipped with active front steering have the features of time varying, uncertainties, high rate of fault, and high burden on the in-vehicle networks, this article studies the adaptive robust control problem for improving lateral stability in steer-by-wire (SBW) vehicles in the presence of abrupt nonlinear faults. First, an upper-level robust H∞ controller is designed to obtain the desired front-wheel steering angle for driving both the yaw rate and the sideslip angle to reach their correct values. Takagi-Sugeno (T-S) fuzzy modeling method, which has shown the extraordinary ability in coping with the issue of nonlinear, is applied to deal with the challenge of the changing longitudinal velocity. The output of the upper controller can be calculated by a parallel distributed compensation (PDC) scheme. Then an event-triggered adaptive fault-tolerant lower controller (ET-AFTC) is proposed to drive the whole SBW system driving the desired steering angle offered by the upper controller with fewer communication resources and strong robustness. By employing a backstepping technique, the tracking performance is improved. The dynamic surface control (DSC) approach is used to avoid the problem of repeated differentiations, and Nussbaum function is adopted to overcome the difficulty of unknown nonlinear control gain. Both the stability of the upper and lower controllers can be guaranteed by Lyapunov functions. Finally, the simulations of Matlab/Simulink are given to show that the proposed control strategy is effectively able to deal with the abrupt nonlinear fault via less communication resources and perform better in ensuring the yaw stability of the vehicle.
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