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controller arrangement for boost converter systems sourced from solar photovoltaic arrays or other maximum power sources

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IEE PROCEEDINGS-ELECTRIC POWER APPLICATIONS 2000年第1期147卷 15-20页

作者： Gow, JA Manning, CD Univ Loughborough Dept Elect & Elect Engn Loughborough Leics England

Conventional power converter systems, such as boost converters, derive their input from sources that may be considered to have negligible output impedances, and as such the use of quite simple conventional control algorithms suffice to give acceptable performance. When the output impedance of the source to such a converter is no longer negligible, and moreover if the source has a markedly nonlinear output impedance, the simple conventional algorithms will no longer be adequate to satisfy the control requirements of the converter. The effect of driving such a converter from a type of source, for example a photovoltaic array which has a point of maximum power delivery within the operating range is discussed, as is the impact that the use of such a source has upon the control requirements of the converter. A novel control arrangement, which includes a complete embedded maximum power tracker, is then presented together with results validating the proposed controller.

关键词： controllers solar cell arrays Power engineering computing Power convertors and power supplies to apparatus photovoltaic power systems control requirements operating range Solar cells and arrays controller arrangement control simulation controllers boost power converter systems maximum power delivery point Power system control control system design and analysis power system analysis computing control system analysis and synthesis methods DC-DC power convertors control of electric power systems power system control PV power systems solar photovoltaic arrays control system analysis computing control algorithm Solar power stations and photovoltaic power systems

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Active damping of structures with guy cables

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JOURNAL OF GUIDANCE control AND DYNAMICS 1997年第2期20卷 320-326页

作者： Preumont, A Achkire, Y Free University of Brussels 1050 Brussels Belgium

A strategy is presented for active damping of structures with guy cables, The active member consists of a piezoelectric actuator collocated with a force sensor. The control algorithm consists of an integral force feedback;it has guaranteed stability, including at the parametric resonance. The results are confirmed by an experiment. Also described is an efficient modeling technique for cable structures;simple and powerful results are established, which permit prediction of the closed-loop poles with a root locus technique. This technique is demonstrated on a guyed truss.

关键词： Trusses Sensors Open Loop Transfer Function control algorithm Piezoelectric Actuators Transverse Vibrations Accelerometer Stiffness control Frequency Response Functions Attitude control System

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Bioinspired Energy Harvesting from Atmospheric Phenomena for Small Unmanned Aerial Vehicles

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JOURNAL OF GUIDANCE control AND DYNAMICS 2020年第4期43卷 685-699页

作者： Gavrilovic, Nikola Bronz, Murat Moschetta, Jean-Marc Univ Toulouse ISAE SUPAERO Dept Aerodynam Energet & Prop 10 Ave Edouard BelinBP 54032 F-31400 Toulouse France Univ Toulouse ENAC Appl Aerodynam URI Drones 7 Ave Edouard BelinBP 54032 F-31400 Toulouse France

This Paper discusses energy harvesting from atmospheric phenomena for small unmanned aerial vehicles, theoretically through simulations and practically through experimental flights. A comparison between different scenarios for flight within the sinusoidal wind profile is presented. A significant improvement in performance with active control of command surfaces has been found for an energy-harvesting mode when compared to autostabilization or fixed-stick flight. Moreover, a detailed decomposition of the stochastic wind profile generated from the Kaimal spectrum has shown which frequencies and magnitudes of wind time series have the highest contribution to the energy-transfer process. It is found that wind profiles with higher turbulence intensity potentially provide more energy for transfer to the aircraft. Furthermore, the Paper reveals a biologically inspired sensory system for wind field estimation. It describes the necessary equipment and control algorithms for the exploitation of atmospheric energy. Initial flight tests were performed to determine the average power consumption of the motor for altitude hold tasks and to evaluate the performance of sensors. Moreover, additional flights for autonomous exploitation of several atmospheric phenomena are presented and analyzed.

关键词： Energy Harvesting UAV Flight Testing Inertial Sensor Atmospheric Turbulence Energy Transfer Proportional Integral Derivative control control algorithm Elevator Deflection Aerodynamic Coefficients

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Engine idle speed control research status and development trend

Engine idle speed control research status and development tr...

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2015 4th International Conference on Mechatronics,Materials,Chemistry and Computer Engineering(ICMMCCE 2015)

作者： Yin Fengfeng Sun Jianmin Wang Wenwen School of Mechanical-electronic and Automobile Engineering Beijing University of Civil Engineering and Architecture

ISBN: (纸本)9781510817371

The engine idle speed control is one of the most important challenges in the engine control fields, essentially the engine idle speed control is a nonlinear, time-varying, complex and uncertain dynamics control problem, the present study the idle speed control problem for improve the gasoline engine fuel economy and reduce emissions is of great significance, this paper reviews the current various working condition of the engine idle speed control method, including the now widespread use of classical control, modern control and intelligent control, the control method can also be used in automobile, electronic, mechanical, and other control system.

关键词： Engine idle speed system control algorithm method evaluation

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Comparison and combination of learning controllers: Computational enhancement and experiments

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JOURNAL OF GUIDANCE control AND DYNAMICS 1996年第5期19卷 1116-1123页

作者： LeeGlauser, GJ Juang, JN Longman, RW NASA LANGLEY RES CTR STRUCT DYNAM BRANCH HAMPTON VA 23681 USA COLUMBIA UNIV DEPT MECH ENGN NEW YORK NY 10027 USA

Five discrete-frequency linear learning-control laws are compared and experimentally tested, These include simple integral-control-based learning using a single learning gain, phase-cancellation learning control, a contraction-mapping learning-control law with monotonic decay of the error norm, and leaning controllers that invert the system model and the observer model. The inversion designs converge the fastest initially, but phase cancellation with identification updates and the contraction-mapping method with model updates have better stability robustness properties. The learning control approaches are combined to obtain the advantages of each, by using inversion methods for the first few repetitions, followed by a more robust method, It is demonstrated that the computation of the learning action can be made in the frequency domain using fast Fourier transform methods, with as much as 94% reduction in computation time, In experiments on a Robotics Research Corporation robot, the learning-control laws result in a reduced rms tracking errors for all joints, by a factor of close to 3 orders of magnitude.

关键词： Frequency Domain Robots Robotics Research Corporation Closed Loop control Feedback control System Single Input Single Output Steepest Descent Method control algorithm Neural Networks Robotics

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EXPERIMENTS WITH MODEL-SIMPLIFIED COMPUTED-TORQUE MANIPULATOR controlLERS FOR FREE-FLYING ROBOTS

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JOURNAL OF GUIDANCE control AND DYNAMICS 1995年第6期18卷 1386-1391页

作者： KONINGSTEIN, R CANNON, RH STANFORD UNIV DEPT AERONAUT & ASTRONAUTSTANFORDCA 94305

A simplified computed-torque controller is presented for two common tasks performed by a two-armed free-flying robot: manipulator inertial endpoint control and cooperative-arm object manipulation. A computed-torque controller is formulated in such a manner that the differences between fixed-base and free-dying controller formulations are explicit and web defined. An analysis of these differences shows that the terms due to robot body accelerations are computationally expensive to include in the controller model, whereas those due to robot body velocities are both computationally inexpensive and vital to proper operation of the controller. For the two robot tasks under study, numerical simulations predict a wide range of robot/payload mass distributions far which robot body accelerations can be neglected in the manipulator controller model with insignificant performance degradation in both open- and closed-loop control, The error introduced is less than that typically due to uncertainties in mass distribution (1%). The performance of two simplified computed-torque controllers are compared to their full-order counterparts using an experimental laboratory robot and found to be indistinguishable from one another. An estimation is made of the significant computational savings possible with this simplification.

关键词： Fixed Based Manipulator Free Flying Robots Closed Loop control Numerical Simulation Six Degree of Freedom Charge Coupled Device Orbital Maneuvering Vehicle Feedback control Actuator Torque control algorithm

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Ram air compensation analysis of fuel cell vehicle cooling system under driving modes

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APPLIED THERMAL ENGINEERING 2018年 142卷 530-542页

作者： Han, Jaeyoung Yu, Sangseok Chungnam Natl Univ Dept Mech Engn 99 Daehak Ro Daejeon 34134 South Korea

The cooling system is one of the major factors used to ensure the performance of the fuel cell vehicle system. In general, the cooling system is composed of a radiator, a reservoir, a water pump, a bypass valve, and a radiator fan. The ram air that enters the vehicle frontal area is also critically important while the vehicle is operating. In this study, cooling system responses considering ram air compensation were investigated to evaluate the control strategy, and control gain was addressed to optimize the control strategy. A dynamic vehicle model was integrated with the fuel cell system model. Three driving cycles were applied to investigate the responses of the cooling system under driving conditions. Three driving conditions considering ram air compensation were investigated to evaluate the cooling system operating trajectory. When the ram air compensation is considered, the cooling system operating trajectory and parasitic power can be accurately predicted. The control adjustment also needs to optimize the parasitic power. As a consequence, the trajectory of system pressure line 1 was found to be more effective for energy saving.

关键词： Fuel cell Ram air compensation Cooling system control algorithm control strategy

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Electrohydraulic linear actuator with two stepping motors controlled by overshoot-free algorithm

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MECHANICAL SYSTEMS AND SIGNAL PROCESSING 2017年 96卷 45-57页

作者： Milecki, Andrzej Ortmann, Jaroslaw Poznan Univ Tech Inst Mech Technol Ul Piotrowo 3 PL-60965 Poznan Poland

The paper describes electrohydraulic spool valves with stepping motors used as electromechanical transducers. A new concept of a proportional valve in which two stepping motors are working differentially is introduced. Such valve changes the fluid flow proportionally to the sum or difference of the motors' steps numbers. The valve design and principle of its operation is described. Theoretical equations and simulation models are proposed for all elements of the drive, i.e., the stepping motor units, hydraulic valve and cylinder. The main features of the valve and drive operation are described;some specific problem areas covering the nature of stepping motors and their differential work in the valve are also considered. The whole servo drive non-linear model is proposed and used further for simulation investigations. The initial simulation investigations of the drive with a new valve have shown that there is a significant overshoot in the drive step response, which is not allowed in positioning process. Therefore additional effort is spent to reduce the overshoot and in consequence reduce the settling time. A special predictive algorithm is proposed to this end. Then the proposed control method is tested and further improved in simulations. Further on, the model is implemented in reality and the whole servo drive system is tested. The investigation results presented in this paper, are showing an overshoot-free positioning process which enables high positioning accuracy. (C) 2017 Elsevier Ltd. All rights reserved.

关键词： Electrohydraulic linear actuator Proportional valve Positioning Stepping motor control algorithm Overshoot

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Experimental verification of vibration reduction in flexible spacecraft using input shaping

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JOURNAL OF GUIDANCE control AND DYNAMICS 1997年第4期20卷 658-664页

作者： Tuttle, TD Seering, WP MIT DEPT MECH ENGNCAMBRIDGEMA 02139

The performance of many spacecraft can be improved by using closed-loop control and command-shaping techniques. However, because little information exists about the operation of controlled structures in zero gravity, it is difficult for designers to anticipate and place confidence in the on-orbit performance of their ground-based control designs, To address this issue, the middeck active control experiment was conducted aboard the Space Shuttle Endeavor in March of 1995. The results of the command shaping experiments implemented during the mission are presented, and guidelines for using command shaping to suppress unwanted vibration in flexible space structures are proposed.

关键词： Flexible Spacecrafts Closed Loop control State Space Systems Space Shuttle Endeavour Zero Gravity Linear Quadratic Gaussian Satellites Structural Vibration White Noise control algorithm

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Analysis and design of a novel active power filter configuration

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IEE PROCEEDINGS-ELECTRIC POWER APPLICATIONS 2000年第4期147卷 320-328页

作者： El-Habrouk, M Darwish, MK Mehta, P Brunel Univ Dept Elect & Comp Engn Uxbridge UB8 3PH Middx England

A novel active filter circuit configuration, including its control algorithm, suitable for power applications is presented which provides an alternative approach to that presently employed. The configuration uses current or voltage source inverter circuits. The main advantages of the proposed circuit are that both the sizes of the capacitors and the switching frequencies are much lower than those in the inverter based filters. Consequently, the system and switching losses are considerably reduced. Moreover, switching devices can withstand higher values of currents at lower frequencies as compared with higher frequency inverter circuits. The theoretical basis for the linear voltage controller, which is used in this work, is fully developed and simulation and experimental results are included.

关键词： power capacitors power filters switching losses Power convertors and power supplies to apparatus switching circuits linear voltage active power filter configuration Other power apparatus and electric machines power applications Active filters and other active networks voltage source inverter capacitors analysis switching devices switching frequencies invertors design active filters control algorithm DC-AC power convertors current source inverter

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