Gotowe bibliografie tematyczne / OPTIMUM COMPENSATION SCHEME

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Gotowa bibliografia na temat „OPTIMUM COMPENSATION SCHEME”

Autor: Grafiati

Data publikacji: 11 września 2023

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Artykuły w czasopismach na temat "OPTIMUM COMPENSATION SCHEME"

Oria, C., V. Baena-Lecuyer, J. Granado, J. Chavez, A. Torralba i C. Pardo. "Optimum Doppler compensation scheme for DVB-H receivers". Electronics Letters 42, nr 13 (2006): 767. http://dx.doi.org/10.1049/el:20061087.

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Tian, Xu, Xingcheng Li i Zibo Zhou. "Novel Uninterruptible Phase-Separation Passing and Power Quality Compensation Scheme Based on Modular Multilevel Converter for Double-Track Electrified Railway". Energies 13, nr 3 (7.02.2020): 738. http://dx.doi.org/10.3390/en13030738.

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Over-voltage and over-current problems of locomotives when passing phase separation and negative sequence current penetration seriously influence the safety of double-track electrified railway and public power systems. In order to solve these problems, this paper proposes a novel uninterruptible power supply phase separation passing and power quality compensation (UPSP-PQC) scheme for double-track electrified railway. Three working modes of UPSP-PQC are put forward, including uninterruptible phase separation passing mode, power quality compensation mode and uninterruptible phase separation passing priority, and power quality compensation optimum mode. A three-leg modular multilevel converter (MMC) topology of UPSP-PQC is proposed and the corresponding control strategy has been studied. PSCAD/EMTDC simulation is performed to verify the correctness and effectiveness of the proposed scheme and its control method.

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Волосюк, Валерій Костянтинович, Володимир Володимирович Павліков, Семен Сергійович Жила, Анатолій Владиславович Попов, Володимир Віталійович Кошарський, Олексій Володимирович Одокієнко, Віталій Георгійович Яковлєв, Едуард Олексійович Церне, Дмитро Сергійович Власенко i Антон Дмитрович Собколов. "Дослідження якісних показників поляризаційної селекції об’єктів на фоні пасивних завад в поляризаційно-доплерівській радіолокаційній системі". Aerospace technic and technology, nr 6 (29.11.2021): 62–73. http://dx.doi.org/10.32620/aktt.2021.6.07.

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The optimal algorithm of polarization-Doppler selection of targets against the background of passive interference is considered. The polarimetric properties of scattered electromagnetic radiation of objects. The functionally-determined mathematical model of the useful signal, structure and correlation characteristics of the internal radiation of the receiver is determined. The algorithm of optimal processing, synthesized within the method of maximum likelihood, is considered for two limit cases. Algorithmic actions in the processing of passive interference and methods of their compensation are considered and investigated. Based on the obtained results, the expression for the algorithm of compensation of interferences reflected from the earth's surface is written. The obtained algorithm equalizes the variance of the input signals and compensates the residual variance with the help of weight coefficients. On the basis of the developed algorithm the scheme of the structurally simplified optimum compensator of passive disturbances is formed. Feature processing of useful signals in the compensation scheme is investigated. To ensure the adaptability of the generated algorithm, the coefficient of the variance ratio is based on the results coming from the variance meter. It is proposed to introduce quality indicators of polarization object selection on the background of the underlying surface, which combines indicators of efficiency of passive interference compensation and indicators of efficiency of useful signal-processing against the background of internal noise of receivers. The corresponding dependence of the indicators on the correlation coefficients of passive interference of different polarizations, as well as on the coefficients that separately characterize the level of difference in signal intensities and interference in the reception channels. The information value of each indicator of the efficiency of polarization signal selection from the ratio of the input variances, the correlation coefficient of passive interference and the ratio of the input signals is investigated.The obtained results are proposed to be used to improve the quality of polarization selection of objects in ground-based and aerospace-based radar systems.

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Dhawan, Divya, i Neena Gupta. "Performance Analysis of Laser Phase Noise Compensated COOFDM System". Journal of Optical Communications 41, nr 4 (28.04.2020): 445–51. http://dx.doi.org/10.1515/joc-2018-0002.

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AbstractOrthogonal Frequency Division Multiplexing along with the coherent detection and spectrally efficient modulation formats is a promising solution for long haul and high speed communication systems. Although they offer significant advantages which make them suitable for high speed and long haul communication systems they all are susceptible to phase noise. In this paper a combination of RF-pilot-based approach followed by pilot-based equalization approach is used for laser phase noise compensation. The various parameters such as drive voltage, bias voltage and extinction ratio are optimized to get the optimum performance from the proposed scheme. The designed system is then analyzed in terms of Symbol Error Rate (SER), constellation diagrams and error vector magnitude using various types of Quadrature Amplitude Modulation (QAM) formats.

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Kurda, Reben. "Heterogeneous networks: Fair power allocation in LTE-A uplink scenarios". PLOS ONE 16, nr 6 (21.06.2021): e0252421. http://dx.doi.org/10.1371/journal.pone.0252421.

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Effective management of radio resources and service quality assurance are two of the essential aspects to furnish high-quality service in Long Term Evolution (LTE) networks. Despite the base station involving several ingenious scheduling schemes for resource allocation, the intended outcome might be influenced by the interference, especially in heterogeneous scenarios, where many kinds of small cells can be deployed under the coverage of macrocell area. To develop the network of small cells, it is essential to take into account such boundaries, in particular, mobility, interference and resources scheduling a strategy which assist getting a higher spectral efficiency in anticipate small cells. Another challenge with small cellular network deployment is further analyzing the impact of power control techniques in the uplink direction for the network performance. With that being said, this article investigates the problem of interference in LTE-advanced heterogeneous networks. The proposed scheme allows mitigation inter-cell interference through fractional self-powered control performed at each femtocell user. This study analyzes a scheme with optimum power value that provides a compromise between the served uplink signal within unwanted interference plus noise ratio to enhance spectral efficiency in terms of throughput. In particular, the maximum transmit power for user equipment in uplink direction should be reviewed for small cells as a major contributor to the interference. The simulation results showed that the proposed fractional power control approach can outperform the traditional power control employed as a full compensation mode in small cell uplinks.

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Chen, Xiangping, Yongxiang Cai, Xiaobing Xiao, Youzhuo Zheng i Anqian Yang. "Solar Energy Compensation for Building Energy Saving with Thermal Comfort in a Cold Climate". Electronics 11, nr 3 (8.02.2022): 491. http://dx.doi.org/10.3390/electronics11030491.

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This paper proposes an energy-saving strategy with assistance from solar thermal compensation for building energy systems. The target of the control strategy was to minimize energy consumption under thermal comfort constraints in buildings. First, the factors influential to indoor temperature in building environments were analyzed. Secondly, the internal and external factors, such as building materials; building orientation; window size; heating, ventilation, and air conditioning (HVAC) facilities; blinding device; solar irradiation; wind speed; and outdoor temperature were used to construct a building model on the platform ENERGYPLUS (E+). A controller aiming to regulate the amount of solar irradiation was developed with the Building Controls Virtual Test Bed (BCVTB) tool. Afterward, the building performance under different strategies was tested by co-simulation using both the computational platforms, E+ and BCVTB. The optimum scheme achieved 30.6% energy savings while meeting the same comfort criterion of its competition strategy. The study verified that the proposed strategy of combined heating, ventilation, and air conditioning and blind control could realize the energy savings and comfort satisfaction at the same time. The proposed method provides a reference to the development of low-/zero-energy building concepts in the field.

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Futatsukawa, K., E. Cicek, Z. Fang, Y. Fukui, S. Mizobata i Y. Sato. "Development of the novel and superior adaptive beam-loading compensation system calculated in the frequency domain for the J-PARC Linac". Journal of Instrumentation 17, nr 11 (1.11.2022): T11002. http://dx.doi.org/10.1088/1748-0221/17/11/t11002.

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Abstract The Japan Proton Accelerator Research Complex (J-PARC) is one of the highest intensity proton accelerator facilities in the world. Its accelerator consists of a 400-MeV linac (LINAC), a 3-GeV rapid-cycling synchrotron (RCS), and a 30-GeV main ring (MR) and its beam is provided for wide-ranging applications. The peak current of the beam at LINAC had been increased from 30 mA to the design value of 50 mA in 2018. Therefore, the performance of the beam-loading compensation implementing in the low-level radio frequency (LLRF) system has been more important to satisfy the stability of the accelerating gradient. Although the iterative learning control (ILC) scheme with adaptive ability was demonstrated, the practical use of ILC was not convenient for large accelerators such as the J-PARC LINAC with forty-nine RF stations. Therefore, we developed at novel and superior adaptive beam-loading compensation system that was calculated in the frequency domain. Compared to the scheme of the previous ILC, the newly developed system is useful because it does not require parameter adjustment using the beam. In the experimental results utilizing this system, the optimum tables of FF_BEAM were able to be obtained as a smaller number of iterations. The peak-to-peak stability of amplitude was achieved to ± 0.23% and the peak-to-peak stability of phase was improved to ± 0.036°. In addition, errors such as white noise did not accumulate for the table of FF_BEAM and this system solved the problem of the divergence when the number of iterations was increased. This implementation of the adaptive beam-loading compensation system calculated in the frequency domain will potentially contribute to the improvement of the J-PARC LINAC LLRF, and this system may lead to a stable user operation. This system is so simple in principle and effective that it could be applied to other linear accelerators with the pulsed beam.

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Awang Ahmad, Zahari, Tien Sze Lim, Voon Chet Koo, Shuhaizar Daud, Muhamad Asmi Romli i Rafikha Aliana A. Raof. "A High Efficiency Gyrostabilizer Antenna Platform for Real-Time UAV Synthetic Aperture Radar (SAR) Motion Error Compensation". Applied Mechanics and Materials 892 (czerwiec 2019): 16–22. http://dx.doi.org/10.4028/www.scientific.net/amm.892.16.

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A gyro-stabilized antenna platform could implement a real-time motion compensation for a SAR system. Since motion errors reduce during the data acquisition process, post-processing load also reduces. Subsequently, production of well-focused, and high-resolution synthetic aperture radar (SAR) images is conceivable. The research is to design a gyro-stabilized SAR antenna platform that compensates motion in real time during data acquisition. This paper explains the study of undesired motion (error) for typical UAV SAR. The resulting angle ranges of yaw, pitch, and roll describe the magnitude of the motion errors. The design of a gimbal system as a stable antenna platform considers yaw, pitch and roll range parameters. IMU optimization (Complimentary Filter, and Madgwick Filter algorithms are tested and compared in order to decide the optimum optimization scheme for the antenna platform. The data fusion and gradient descent algorithm from Madgwick show significant performance. The implementation of the optimized IMU algorithm and control on a field programmable gate array (FPGA) has resulted in a very effective stable antenna platform.

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Yuan, Ye, i Cheng Liu. "Passive Power Filter Optimization Problem Based on Adaptive Multipopulation NSGA-II and CRITIC-TOPSIS". Mathematical Problems in Engineering 2022 (25.10.2022): 1–18. http://dx.doi.org/10.1155/2022/5753651.

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The best configuration of passive filters in extra-high voltage systems is investigated in this study using a two-stage multiobjective decision-making (MODM) framework. A collection of Pareto solutions is found using an adaptive multipopulation-modified nondominated ranking genetic algorithm (AMP NSGA-II) in the first stage. The goals taken into account include the least fundamental reactive power compensation losses, overall cost and maintenance cost, and simultaneous minimum harmonic current distortion rate. The objective weights are determined and the optimum solution is chosen in the second stage using the criteria importance interrelationship (CRITIC) and similarity ranking preference technique (TOPSIS). A number of examples show how the suggested method performs more effectively than the conventional and well-known algorithm and can identify the relationship between the objective functions, indicating that the suggested scheme has better superiority in filters and has a promising future in the solution of multiobjective problems.

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Subhash, Bochu, i Veramalla Rajagopal. "EPLL Control Technique Optimum Controller Gains to Control Voltage and Frequency in Standalone Wind Energy Conversion System". European Journal of Electrical Engineering 24, nr 1 (28.02.2022): 55–65. http://dx.doi.org/10.18280/ejee.240108.

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This study describes how to regulate the frequency and terminal voltage of a freestanding wind energy conversion system using an Enhanced Phase Locked Loop (EPLL)-based strategy to supply power to varied loads regardless of wind speed. In a standalone wind turbine energy conversion system, the EPLL control scheme extracts the reference source currents (SWECS). The control algorithm employs two proportional-integral (PI) controllers to create the active and reactive power components of the consumers' load currents, estimate reference source currents, and connect the zigzag transformer to PCC with VSC for neutral current compensation. To obtain optimal PI controller gains and most-suited settings to apply to SWECS, optimization approaches are used. The control algorithm is the most significant aspect of the system, and the speed with which it calculates, evaluates, and guesstimates determines the generation of source currents based on the algorithm's ideal controller PI gains. By properly estimating source currents, the EPLL control method improves dynamics and power quality issues, and the optimization technique is employed to acquire the gains of PI controllers. The proposed system employs the EPLL algorithm on a three-phase, four-wire system with changing loads to achieve ideal total harmonic distortion of source currents and voltages on the PCC, as defined by IEEE-519 standards. A battery energy storage device coupled to the VSC dc link keeps the load's necessary power constant. If the generator output exceeds the consumer demand, the excess power is delivered to BESS for temporary storage. When consumer demand exceeds generated power, a BESS delivers deficit power to the load, which adjusts and the frequency under various load conditions. The suggested system simulated results were tested with 3-phase 4-wire for harmonics reduction, load balancing, neutral wire current compensation, frequency and voltage control using MATLAB / Simulink.

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Rozprawy doktorskie na temat "OPTIMUM COMPENSATION SCHEME"

SINGH, ABHISHEK KUMAR. "OPTIMUM COMPENSATION SCHEME FOR ULTRA HIGH VOLTAGE LONG TRANSMISSION LINE". Thesis, 2011. http://dspace.dtu.ac.in:8080/jspui/handle/repository/19701.

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Części książek na temat "OPTIMUM COMPENSATION SCHEME"

Cui, Shiliang, Zhongbin Wang i Luyi Yang. "Referral Priority Programs". W Innovative Priority Mechanisms in Service Operations, 75–98. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-30841-3_5.

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AbstractThis chapter presents a model of the referral priority program, an emerging business practice adopted by a growing number of technology companies that manage a wait list of customers. It enables existing customers on the wait list to gain priority access if they successfully refer new customers to the wait list. Unlike more commonly used referral reward programs, this novel mechanism does not offer monetary compensation to referring customers but leverages customers’ own disutility of delays to create referral incentives. Despite this appealing feature, our queueing-game-theoretic analysis finds the effectiveness of such a scheme as a marketing tool for customer acquisition, and an operational approach for wait-list management depends crucially on the underlying market conditions, particularly the base market size of organic customers. The referral priority program does not generate referrals when the base market size is either too large or too small. When customers do refer, the program could actually backfire, namely, by reducing the system throughput and customer welfare, if the base market size is intermediately large. This phenomenon occurs because the presence of referred customers severely cannibalizes the demand of organic customers. We also compare the referral priority program with the referral reward program and find that the referral priority program is more profitable when the base market size is intermediately small. We further solve for the optimal scheduling rule of the referral priority program and find that in addition to full priority and FIFO, partial priority and strategic delay can also emerge in the optimal mechanism. This chapter is primarily based on Yang and Debo (Manag Sci 65(5):2231–2248, 2019) and Yang (Manuf Serv Oper Manag 23(5):1139–1156, 2021) where interested readers can find proofs of the results shown in this chapter.

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Maltsev, Alexander, Andrey Pudeev, Seonwook Kim, Suckchel Yang, Seunghwan Choi i Sechang Myung. "Phase Tracking Sequences for 5G NR in 52.6-71 GHz Band: Design and Analysis". W Proceedings of CECNet 2021. IOS Press, 2021. http://dx.doi.org/10.3233/faia210412.

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This paper presents a novel approach to the phase tracking reference signal (PTRS) design for phase noise impact compensation in the 5G NR communication systems intended to work in a new 52.6 GHz to 71 GHz frequency band. For detailed problem illustration, the phase noise compensation algorithms are discussed and explained, from the basic common phase error (CPE) compensation to the MMSE-base inter-carrier interference (ICI) filtering. Performance of the different phase noise compensation algorithms is investigated for the baseline PTRS accepted in the current 5G NR specification and compared with the newly proposed approach to the PTRS design. This approach is based on nulling the subcarriers adjacent to the reference signals to minimize influence of the ICI on the estimation process. It was shown that new nulling PTRS design outperforms currently used distributed PTRS structure. In addition, numerical results represent a trade-off between the filter size and the amount of the allocated training resources to achieve better performance. It was shown that proposed PTRS structures and processing algorithms give ICI compensation level very close to optimal scheme and thus, different approaches (such as time domain compensation) may be required for further progress.

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Quadir, Uzma, Krishna Tomar, Sheikh Safi-Ullah i Zahid Farooq. "Optimal Control Strategy For Performance Improvement of Hybrid Power System Using Grey Wolf Optimised PIID Controller". W New Frontiers in Communication and Intelligent Systems, 37–45. Soft Computing Research Society, 2021. http://dx.doi.org/10.52458/978-81-95502-00-4-5.

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The problems of load frequency control (LFC) using optimal controllers are discussed in this paper. Two area power systems are implemented and analysed in each region as a result of abrupt load changes. The goal is to prevent errors caused by frequency and tie- line electric supply disruptions with the aim to assure cost effective power generation. P/ PI/ PID/ PIID compensating schemes have been developed and successfully tested. The gains of P/ PI/ PID/ PIID controllers are optimised using Grey Wolf algorithm on a two area power-network. The generating Stations used in this whole operation are Wind Thermal and Solar Thermal. The performances of said controllers are compared and an optimal one is chosen. When the findings of the suggested approach are compared to those of some recently published approaches, the benefits of the proposed approach become clear. The sensitivity analysis is carried out, demonstrating the proposed approach’s ability to cope with large changes in device parameters. This method is tested under a variety of load conditions.

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Khan, Laiq, Rabiah Badar, Saima Ali i Umar Farid. "Comparison of Uncertainties in Membership Function of Adaptive Lyapunov NeuroFuzzy-2 for Damping Power Oscillations". W Fuzzy Systems, 74–131. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-1908-9.ch004.

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The direct focus of this chapter is to explore the potential of online Adaptive NeuroFuzzy Type-2 (ANFT2) control system for damping inter-area oscillations using Static Synchronous Compensator (STATCOM). The nonlinear ANFT2-based direct control scheme is proposed to damp inter-area oscillations by utilizing its model free and universal approximation capabilities. The Gaussian and triangular membership functions with different variations of uncertain mean and standard deviation are considered for ANFT2. The adaptation mechanism utilizes gradient descent-based back-propagation algorithm using Lyapunov stability criteria to update the rule parameters. The performance evaluation of proposed control strategy has been validated using two and three machine power systems. The nonlinear time domain simulations reveal that ANFT2 has excellent damping capabilities as compared to conventional PI control. Simulation results for different performance indices further emphasize the optimal performance of ANFT2 with uncertain mean and variance of triangular membership function in transient and steady state region.

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Khan, Laiq, Rabiah Badar, Saima Ali i Umar Farid. "Comparison of Uncertainties in Membership Function of Adaptive Lyapunov NeuroFuzzy-2 for Damping Power Oscillations". W Handbook of Research on Artificial Intelligence Techniques and Algorithms, 260–321. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-7258-1.ch009.

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Streszczenia konferencji na temat "OPTIMUM COMPENSATION SCHEME"

Røryset, Arne, i Dag Roar Hjelme. "How to Increase Transmission Power Budget by Combatting SPM Induced Distortion with Optimum Pre- and Post-Compensation of Dispersion in 10-40gbit/S NRZ and RZ Unrepeatered Systems". W The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.cthh103.

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Implementing long repeaterless transmission at high bitrates on conventional single mode fibre (SMF) at 1.55µm may be a cost-effective network design. Dispersion compensation is necessary due to high dispersion, while distortion due to self phase modulation (SPM) must be cambatted since high input powers is necessary to achieve high power budget. In this paper we demonstrate numerically that the power budget may be increased considerable if the amount of pre- and post-compensation is optimized. Furthermore, our results shows that optimum modulation format depends on the selected compensation scheme.

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Shirkhodaie, Amir, i A. H. Soni. "Redundancy Compensation in Control of Multiple Arms". W ASME 1991 Design Technical Conferences. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/detc1991-0176.

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Abstract During manipulation of an object grasped at N locations by end-effectors of N robots, relaxation of assumption on invariant grasping locations of end-effectors Is too realistic. When coordinating end-effectors take infinitesimal displacements at the contact grasping locations with a rigid object, a slippage occurs which undesirably induces some redundancy in closed form kinematics/dynamics formulation of the entire robotic system. Particularly, in force/position control of multiple coordinating robot arms such an affect produces Inevitable impulsive reaction forces/moments which need to be compensated for in global control strategy of the system. In this paper, we have presented a control strategy with a Dynamic Redundancy Compensator (DRC) for cartesian space control of the coordinating multiple robots manipulating a common object. The proposed control scheme embeds dynamics of the individual coordinating robot arms and dynamically is capable to compensate for the kinematic/dynamic redundancies while preserving optimum forces/torques distribution between the end-effectors of robot arms. The results of study has been demonstrated on control of two robot arms manipulating a common object through prescribed coordinated motions.

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Al-Bassyiouni, M. "Noise Reduction of Three Dimensional Enclosed Sound Fields Using Nonlinear Compensation". W ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68999.

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In this paper, the feasibility of implementing a nonlinear compensator technique in reducing noise transmitted into a three dimensional enclosure through a flexible panel is presented. A spherical wave, which is generated by a noise source located in the near field, is transmitted into a rectangular enclosure through a flexible panel. Piezoelectric patches, which are bonded symmetrically to the top and bottom surfaces of the panel, are used as actuators. The analytic model used here accounts for panel interactions with both the external and enclosed sound fields and the bonded piezoelectric patches, and this feature makes it appealing for a broad field of model-based active, passive, and hybrid noise control schemes. The nonlinear compensation scheme aims to increase the damping of the flexible panel linearly with the panel vibration amplitude and, thus, attenuates noise fields associated with structural resonance frequencies. Simulation results show that, despite the simple structure of the nonlinear compensator, high attenuation levels could be achieved. Results also show that the control input of the nonlinear compensation scheme is reduced, when compared to optimal control schemes.

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Nolen, Chris, i Farbod Fahimi. "External Disturbance Compensation for Humanoid Robots via a Configuration Control Approach". W ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65021.

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A redundancy resolution scheme to maintain a desired support force on the stance foot of a redundant humanoid robot is considered. The proposed motion planner will mitigate the effect of unknown external disturbances on the robot. For the first time, the proposed approach considers not only the position of the Zero-Moment-Point (ZMP), but also the reaction forces in the plane of the foot and the reaction moment normal to the plane of the foot. So, not only possible tipping of the robot due to an external disturbance, but also possible sliding of the foot, is addressed. An acceleration level configuration control approach is used to find the optimum solution for joint accelerations of the robot to reproduce both the desired gait and support reactions as close as possible. These joint accelerations are then integrated to develop joint positions to be implemented by the robot. The motion planner is demonstrated by simulating a planar humanoid robot. It is shown the proposed approach is effective in mitigating external disturbances while maintaining the desired body trajectory.

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Buhagiar, Daniel, Tonio Sant i Marvin K. Bugeja. "Control of an Open-Loop Hydraulic Offshore Wind Turbine Using a Variable-Area Orifice". W ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41388.

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The viability of offshore wind turbines is presently affected by a number of technical issues pertaining to the gearbox and power electronic components. Current work is considering the possibility of replacing the generator, gearbox and electrical transmission with a hydraulic system. Efficiency of the hydraulic transmission is around 90% for the selected geometries, which is comparable to the 94% expected for conventional wind turbines. A rotor-driven pump pressurises seawater that is transmitted across a large pipeline to a centralised generator platform. Hydroelectric energy conversion takes place in Pelton turbine. However, unlike conventional hydro-energy plants, the head available at the nozzle entry is highly unsteady. Adequate active control at the nozzle is therefore crucial in maintaining a fixed line pressure and an optimum Pelton turbine operation at synchronous speed. This paper presents a novel control scheme that is based on the combination of proportional feedback control and feed forward compensation on a variable area nozzle. Transient domain simulation results are presented for a Pelton wheel supplied by sea water from an offshore wind turbine-driven pump across a 10 km pipeline.

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Jing, Ge, Liu Haijun, Song Jieying, Zhao Guoliang i Zhang Yifan. "Optimal Arrester Configuration Scheme for Series Compensation Devices". W 2019 IEEE 8th International Conference on Advanced Power System Automation and Protection (APAP). IEEE, 2019. http://dx.doi.org/10.1109/apap47170.2019.9224974.

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Rus, D. C., N. S. Preda, R. Teodorescu i Maria Imecs. "Compensation methods applied in current control schemes for large AC drive systems". W 2012 13th International Conference on Optimization of Electrical and Electronic Equipment (OPTIM). IEEE, 2012. http://dx.doi.org/10.1109/optim.2012.6231934.

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Cui, Wei, Wei Xue i Xiaolin Chen. "Compensator Design for a MEMS Gyroscope With Quadratic Optimal Control". W ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/detc2010-28533.

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A number of control algorithms have been reported to adopt force balancing scheme into MEMS vibratory gyroscope systems. In practice, however, many algorithms are difficult to implement with electronic circuits. This paper designs and analyzes a lead compensator for a MEMS gyroscope via the Linear Quadratic Regulator (LQR) technique. LQR optimizes and balances the control effort and system response swiftness. Simulation shows the gyroscope achieves high linearity, wide dynamic range, and high robustness to fabrication uncertainties with this efficient compensator design. The closed-loop scale factor uniformity error is 0.7% under ±10% parameter perturbations. The compensator designed in this paper exhibits comparable outstanding performance compared to other reported control algorithms. The method reported in this paper is proved to be effective and can be used in a wide range of applications.

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Choi, Chintae, i Tsu-Chin Tsao. "Synthesis of an H∞ Controller With Preview Compensation". W ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0277.

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Abstract An optimal preview controller based on the discrete-time H∞ control is presented. The preview controller is synthesized by considering the bounded unknown disturbances as well as pre-viewable commands and disturbances. The controller derivation procedure is analogous to the LQ-based scheme. The designed preview gain matrix has a similar structure as the LQ-based one. As the infinity norm γ of the transfer function matrix tends to ∞, the preview gains obtained by H∞ control method approach to the gains by the LQR. The LQ-based preview gains are verified to be subsets of the H∞-based preview gains.

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Yu, Shuwen, i Masayoshi Tomizuka. "Iterative Learning Control With Optimal Feedback and Feedforward Control". W ASME 2010 Dynamic Systems and Control Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/dscc2010-4282.

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Iterative learning control (ILC) is a feedforward control strategy used to improve the performance of a system that executes the same task repeatedly, but is incapable of compensating for non-repetitive disturbances. Thus a well-designed feedback controller needs to be used in combination with ILC. A robustness filter called the Q-filter is essential for the ILC system stability. The price to pay, however, is that the Q-filter makes it impossible for ILC to achieve perfect tracking of the repetitive reference or perfect cancellation of repetitive disturbances. To reduce error, it is effective to apply a pre-design feedforward control input in addition to ILC. In this paper, a simple P-type ILC is combined with an optimal feedback-feedforward control inspired by classic predictive control, so as to take advantages of each control strategy. It will be shown that the choice of the injection point of the learned ILC effort is crucial for a tradeoff between stability and performance. Therefore, the stability and performance analysis based on different injection points is studied. A systematic approach to the combined control scheme is also proposed. The combined control scheme is attractive due to its simplicity and promising performance. The effectiveness of the combined control scheme is verified by simulation results with a wafer scanner system.

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