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Torque controller of a doubly-fed induction generator impelled by a DC motor for wind system applications

IET RENEWABLE POWER GENERATION 2014年第5期8卷 484-497页

作者： Morfin, Onofre A. Ruiz-Cruz, Riemann Loukianov, Alexander G. Sanchez, Edgar N. Castellanos, M. I. Valenzuela, Fredy A. Autonomous Univ Juarez City Ciudad Juarez Chihuahua Mexico IPN Ctr Res & Adv Studies Zapopan Jalisco Mexico Autonomous Juarez Univ Tabasco Cunduacan Tabasco Mexico

The authors propose robust non-linear controllers for a wind system. The proposed controllers are based on a combination of the block control linearisation and super-twisting algorithm, as a second-order sliding mode technique. The main control loop is designed to regulate the electromagnetic torque and stator power factor of a doubly-fed induction generator which is connected to the grid. The generator is mechanically coupled with a DC motor, which can emulate the wind turbine operation. Therefore, an auxiliary control loop is designed to control the DC motor velocity. Additionally, a grid-side converter controller is proposed to regulate the DC-link voltage into AC/DC/AC converter, and displacement factor of the energy flow between the rotor and the grid. A robust stability analysis of the complete closed-loop system under external disturbances is presented. The robustness of the proposed control schemes is validated in real time using a workbench, which consists of a motor-generator group, AC/DC/AC electronic drive and dSPACE DS 1104 controller boards.

关键词： AC-DC power convertors angular velocity control asynchronous generators control system synthesis DC-AC power convertors DC motor drives electric current control linearisation techniques load flow control nonlinear control systems power control power generation control power generation faults power grids power system stability robust control torque control variable structure systems voltage control wind power plants wind turbines torque controller doubly-fed induction generator DC motor velocity control wind system application robust nonlinear controller block control linearisation super-twisting algorithm second-order sliding mode technique electromagnetic torque regulation stator power factor regulation wind turbine operation auxiliary control loop system design grid-side converter controller DC-link voltage regulation AC-DC-AC converter energy flow displacement factor rotor robust stability analysis power system disturbance motor-generator group AC-DC-AC electronic drive dSPACE DS 1104 controller board

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Assisted Rehabilitation by Robotic Orthosis of Spinal Cord and Back Injuries 6

Assisted Rehabilitation by Robotic Orthosis of Spinal Cord a...

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6th Latin American Biomedical Engineering Conference (CLAIB)

作者： Cruz, David Ballesteros, Mariana Salgado, Ivan Chairez, Isaac Inst Politecn Nacl UPIBI Bioproc Dept Mexico City 07738 DF Mexico

ISBN: (纸本)9783319131160;9783319131177

This study addressed the design, construction and control of a prototype of active orthosis focused on assisting the rehabilitation of patients with spinal cord or/and back illnesses. The prototype was actuated with a collection of direct current motor commanded by distributed control strategy based on the so-called twisting controller. This control action used a super-twisting algorithm as robust differentiator to supply the time derivative of the tracking error. A graphic user interface (GUI) was implemented to enforce the application of different therapies accordingly to the most common strategies used in clinical rehabilitation. The orthosis was implemented and the proposed controller forced the tracking of the reference trajectories supplied by the GUI. The orthosis was evaluated in simulation to adjust the controllers and differentiators gains. A real orthosis was constructed and controlled using the gains obtained at the simulation stage. The actual orthosis was evaluated to check the ability of the controller to track the reference trajectory despite the resistance of the patient that was simulated by different dummies devices.

关键词： Active orthosis spinal cord injuries sliding mode control twisting controller super-twisting algorithm

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Second-order sliding-mode control of DFIG-based wind turbines

Second-order sliding-mode control of DFIG-based wind turbine...

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3rd Renewable Power Generation Conference (RPG 2014)

作者： Xiaorong Zhu Shipeng Liu Yi Wang State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources( North China Electric Power University) China

ISBN: (纸本)9781634396523

Traditional vector control schemes which comprise proportional-integral (PI) controller for the Wind turbine-driven DFIGs have the drawbacks such as parameter tuning difficulties, inferior dynamic performances and poor robustness. Thus, based on the analysis of the mathematical model of the DFIG-based wind turbines, this paper addresses a non-linear control algorithm based on 2-SMC. The super-twisting algorithm is adopted to control the rotor side converter (RSC) and the grid side converter (GSC) at a fixed switching frequency. In addition, single power (or voltage) control loops instead of cascaded current and power (or voltage) control loops are used for the RSC and the GSC, which simplify the design of the controllers. Simulation results evidence both the high dynamic performance and the superior robustness achieved with proposed control scheme.

关键词： Doubly fed induction generator (DFIG) robustness second-order sliding-mode control (2-SMC) super-twisting algorithm Wind Energy Conversion Systems generalized sidelobe canceller GSC gene Radar Scan Converter Robustness control ring Variable structure systems PI control Voltage regulation dynamic characteristics Pest Control Vector control super twisted nematic Converters

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Estimation of Road Adhesion Coefficient Using Higher-Order Sliding Mode Observer for Torsional Tyre Model

Estimation of Road Adhesion Coefficient Using Higher-Order S...

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6th International Conference on Intelligent Robotics and Applications (ICIRA)

作者： Rath, J. J. Veluvolu, K. C. Zhang, D. Zhang, Q. Defoort, M. Kyungpook Natl Univ Coll IT Engn Sch Elect Engn Daegu 702701 South Korea Shanghai Jiao Tong Univ State Key Lab Mech Syst & Vibrat Shanghai 200240 Peoples R China Univ Lille Nord France CNRS UVHC LAMIHUMR 8201 F-59313 Valenciennes France

ISBN: (纸本)9783642408496;9783642408489

The estimation of friction coefficient for a vehicle when it traverses on different surfaces has been an important issue. In this paper, a super-twisting algorithm based sliding mode observer is proposed to estimate the road adhesion coefficient, treated as an unknown input in the dynamics of a quarter-vehicle. By estimating the road adhesion coefficient, the coefficient of friction can be estimated. Simulation results show the effectiveness of the proposed observer in estimation of the road adhesion coefficient that changes with surface variations.

关键词： super-twisting algorithm LuGre friction model torsional tyre model road adhesion coefficient

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Second-order sliding mode control applied to inverted pendulum

Second-order sliding mode control applied to inverted pendul...

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14th International Conference on Sciences and Techniques of Automatic Control and Computer Engineering (STA)

作者： Mahjoub, Sonia Mnif, Faical Derbel, Nabil Ecole Natl Ingn Sfax Control & Energy Managment BP W Sfax 3038 Tunisia Sultan Qaboos Univ Dept Elect & Comp Engn Muscat Oman

ISBN: (纸本)9781479929542

Sliding mode control (SMC) has been considered as an effective tool in different studies for control systems. The robustness of SMC against the disturbances and model uncertainties makes the system stable. However, the chattering phenomenon degrades the system performances, it may even lead to instability. This paper deals with the second ordre sliding mode the twisting and super-twisting algorithm to solve the tracking control of underactuated manipulators. Further, comparison between controllers has been done. Simulation results are given to demonstrate the effectiveness of the proposed approaches.

关键词： Underactuated manipulator sliding mode control twisting algorithm super-twisting algorithm cart-pendulum

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Global finite-time stabilization of planar nonlinear systems with disturbance

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ASIAN JOURNAL OF CONTROL 2012年第3期14卷 851-858页

作者： Li, Peng Zheng, Zhiqiang Natl Univ Def Technol Dept Automat Control Coll Mechatron Engn & Automat Changsha 410073 Hunan Peoples R China

This paper proposes a continuous global finite-time controller for a class of planar systems with disturbance. The proposed controller consists of nominal and compensated parts. The nominal part, designed by an homogeneity-based technique, takes care only of the nominal system. The closed-loop nominal system is asymptotically stable and satisfies negative homogeneity of degree. However, using a finite-time convergent second order sliding mode super-twisting algorithm, the compensated part enables cancelling of the disturbance which is time-varying or unbounded as long as its derivative is bounded. The combination of the nominal and compensated parts makes the planar system globally finite-time stable. Simulation results show the effectiveness of the proposed method. Copyright (C) 2011 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society

关键词： Planar nonlinear systems homogeneity finite-time stabiliza-tion super-twisting algorithm

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A second order sliding mode strategy for fault detection and fault-tolerant-control of a MEMS optical switch

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MECHATRONICS 2012年第6期22卷 696-705页

作者： Saif, Mehrdad Ebrahimi, Behrouz Vali, Mehdi Univ Windsor Fac Engn Dept Elect & Comp Engn Windsor ON N9B 3P4 Canada Texas A&M Univ Qatar Mech Engn Program Doha 23874 Qatar Univ Kashan Fac Engn Kashan Iran

Optical switches are widely used in telecommunication industry due to their many desirable characteristics. In this paper, robust fault detection and fault-tolerant-control (FTC) system for an uncertain nonlinear MEMS optical switch are presented. The design strategy is based on the second order sliding mode approach. A robust second order nonlinear sliding mode observer capable of filtering unwanted high frequencies due to unmodeled dynamics is used to generate quantities called the the residuals. The residuals are then used for the purpose of fault detection and alarm generation. Once an alarm is registered, a fault tolerant control strategy is employed. Two different fault-tolerant control strategies for the unhealthy system are considered. The first strategy is based on conventional sliding mode, while the second is based on a second order sliding mode theory. Robustness and convergence of the proposed schemes are proved using the second method of Lyapunov and the super-twisting algorithm. A comparative study is then performed to demonstrate the superior capability of second order sliding mode control strategy in fault accommodation. Finally, the effectiveness of the proposed strategy for detection of faults, and subsequent control of the MEMS optical switch is illustrated through simulation studies. (C) 2012 Elsevier Ltd. All rights reserved.

关键词： Second order sliding mode super-twisting algorithm Robustness Fault-diagnosis Fault-tolerant control MEMS optical switch

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Design of Second-order Sliding Mode Controller for Electromagnetic Levitation Grip used in CNC

Design of Second-order Sliding Mode Controller for Electroma...

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24th Chinese Control and Decision Conference (CCDC)

作者： Liu Chunfang Zhang Jian Shenyang Univ Technol Sch Elect Engn Shenyang 110870 Peoples R China

ISBN: (纸本)9781457720727

A novel second-order sliding model controller aiming at the inherent chattering of classical sliding mode control for high-precision air gap control of Electromagnetic Levitation Grip used in CNC(Computerized Numerical Control) was proposed, and the control strategies based on super-twisting algorithm was designed. Electromagnetic Levitation Grip is a very complex system with real parameter uncertainties and external disturbances in the process of air gap control. This method can eliminate the chattering which may excite high frequency chattering, keep the robustness of system, and effectively improve the dynamic response of system. Simulation results demonstrate that the design of Second-order sliding mode controller can achieve the better stability of suspension, strong immunity and high stiffness.

关键词： Electromagnetic Levitation system chattering second-order sliding mode super-twisting algorithm

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High-order sliding mode control of a DC motor drive via a switched controlled multi-cellular converter

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INTERNATIONAL JOURNAL OF SYSTEMS SCIENCE 2011年第11期42卷 1869-1882页

作者： Djemai, M. Busawon, K. Benmansour, K. Marouf, A. Univ Lille Nord France F-59000 Lille France UVHC LAMIH F-59313 Valenciennes France CNRS FRE 3304 F-59313 Valenciennes France Northumbria Univ Sch Comp Engn & Informat Sci Newcastle Upon Tyne NE1 8ST Tyne & Wear England Univ Medea Dept Elect Engn Medea Algeria

In this article, we present a high-order sliding mode controller of a DC motor drive connected to a multi-cellular converter. More specifically, we design a second-order (super-twisting) control algorithm for the speed regulation of a DC motor. For this, a switching control for the multi-cellular converter is derived in order to supply the correct reference value for the speed regulation. A practical implementation of the controller is realised using a laboratory set-up. The performance and the validity of the controller are shown experimentally.

关键词： control of hybrid systems sliding mode control multi-cellular converter super-twisting algorithm

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super-twisting second-order sliding mode control for a synchronous reluctance motor

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ARTIFICIAL LIFE AND ROBOTICS 2011年第3期16卷 307-310页

作者： Chiang, Huann-Keng Lin, Wen-Bin Chang, Yi-Chang Fang, Chun-Chiang Natl Yunlin Univ Sci & Technol Dept Elect Engn Touliu 640 Yunlin Taiwan Natl Yunlin Univ Sci & Technol Grad Sch Engn Sci & Technol Touliu Yunlin Taiwan

This article presents the design and implementation of a super-twisting second-order sliding-mode controller (SOSMC) for a synchronous reluctance motor. Second-order sliding-mode control is an effective tool for the control of uncertain nonlinear systems since it overcomes the main drawbacks of the classical sliding-mode control, i.e., the large control effort and the chattering phenomenon. Its real implementation implies simple control laws, and ensures an improvement in the sliding accuracy with respect to conventional sliding-mode control. This article proposes a novel scheme that is based on the technique of super-twisting second-order sliding-mode control. First, SOSMC is derived mathematically, and then the performance of the proposed method is verified by simulations. The proposed SOSMC shows robustness for variations in the motor parameters and an improvement in the chattering phenomenon.

关键词： super-twisting algorithm Second-order sliding modes Synchronous reluctance motor Chattering phenomenon

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