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modeLING AND NONLINEAR DYNAMICAL ANALYSIS OF THE CUK CONVERTER UNDER FREE-RUNNING CURRENT-PROGRAMMED CONTROL

INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS 2008年第10期18卷 3093-3099页

作者： Zhao, Yi-Bo Wei, Du-Qu Luo, Xiao-Shu Anhui Normal Univ Coll Phys & Elect Informat Wuhu 241000 Peoples R China Guangxi Normal Univ Coll Phys & Elect Engn Guilin 541004 Peoples R China

In this paper, a sliding-mode variable structure model is proposed for studying the nonlinear dynamical behaviors of the free-running current-programmed Cuk converter. Conditions for the occurrence of various bifurcations are derived analytically, along with simulation results that illustrate the theoretical findings. This paper provides useful information for the stability design of Cuk converters under free-running current-programmed control and illustrates the application of the nonlinear analysis method to a specific type of plant.

关键词： Bifurcation sliding mode variable structure Cuk converter nonlinear dynamics

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Robust consensus braking algorithm for distributed EMUs with uncertainties

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IET CONTROL THEORY AND APPLICATIONS 2019年第17期13卷 2766-2774页

作者： He, Jing Yang, Buchong Zhang, Changfan Liu, JianHua Mao, Songan Shi, Laicheng Cheng, Xiang Hunan Univ Technol Sch Elect & Informat Engn Zhuzhou 412007 Hunan Peoples R China Purdue Univ Sch Elect & Comp Engn W Lafayette IN 47907 USA CRRC Zhuzhou Elect Co Ltd Zhuzhou 412007 Hunan Peoples R China

In this study, the velocity tracking control of electric multiple units (EMUs) with non-linearity and uncertainty during braking is investigated. A consensus braking algorithm with distributed sliding mode observers is proposed. Firstly, a multi-agent model with non-linear coupling and uncertain external disturbances is established. Secondly, distributed observers are designed, in which a real-time estimation equation for coupling force and disturbances is established based on the equivalent control principle of sliding mode variable structure. Finally, a robust consensus algorithm is proposed to achieve a consensus velocity tracking of each carriage on the target braking curve. The distances between the adjacent carriages are stabilised at stationary distances in a safe range by an artificial potential field function. Experiments show that the algorithm has high accuracy and anti-interference ability in the braking process.

关键词： observers braking control system synthesis robust control variable structure systems uncertain systems multi-agent systems road traffic control road vehicles robust consensus braking algorithm distributed EMUs velocity tracking control electric multiple units distributed sliding mode observers multiagent model nonlinear coupling distributed observers coupling force equivalent control principle robust consensus algorithm consensus velocity tracking braking process sliding mode variable structure artificial potential field function

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Research on model identification and compound control of vibration mirror swing scan system

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MEASUREMENT & CONTROL 2023年第1-2期56卷 420-431页

作者： Du, Xiaoyan Li, Jianying Guo, Xinmin Zhang, Jianlong Harbin Univ Sci & Technol Sch Mech & Power Engn Harbin 150080 Heilongjiang Peoples R China Minist Educ Key Lab Adv Mfg & Intelligent Technol Harbin Heilongjiang Peoples R China Harbin Inst Technol Sch Astronaut Harbin 150001 Heilongjiang Peoples R China

According to the principle of system identification, the least squares algorithm and MATLAB system identification toolbox is used to identify the model of the test bench of the vibration mirror swing scan system with the step signal and the vibration mirror swing-sweep angular displacement as the input and output quantities. Taking the identification model as the object, a sliding mode variable structures composite controller of fuzzy switching gain adjustment is designed. In the controller, according to the actual conditions achieved by the sliding mode, the switching gain is effectively estimated, so as to eliminate the interference of uncertain factors and high-frequency vibration. At the same time, the sliding mode function and sliding mode controller of the system needs to be designed. The switching hyperplane of the system is designed using the fuzzy switching method and the desired dynamic characteristics of the system, to ensure the smooth transition of the system state from outside the hyperplane to the convergence of the switching hyperplane. The simulation results show that: the new composite control method eliminates the shortcomings of PD series control, improves the response speed and tracking accuracy of the vibration mirror swing scan system, and improves the overall performance of the system. And it has a strong ability to inhibit the adverse effects caused by changes in the parameters of the controlled object.

关键词： Vibration mirror swing scan system model identification least squares algorithm sliding mode variable structure fuzzy switching comprehensive performance

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Research on the Shortest variable-Slip mode DC-Side Voltage Control of APF Command Current

Research on the Shortest Variable-Slip Mode DC-Side Voltage ...

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International Conference on Electronics Technology (ICET)

作者： Dedong Zhou Danyang Zhao School of Electrical Engineering Lanzhou Polytechnical College Lanzhou China

ISBN: (数字)9781728162836

ISBN: (纸本)9781728162843

During the startup process, the APF is converted from uncontrolled rectifying to controlled rectifying, and a step-function signal is input to the DC side to cause the increase of capacitor voltage and generate an inrush current. The existing method for suppressing the APF grid-connected voltage is a long charging time, complicated hardware circuit, and complicated parameter setting. Aiming at the above problems, this paper proposes the shortest variable-slip mode control of APF DC-side voltage command current link, establishes the shortest command current generating circuit under dq coordinates, generates DC-side voltage command current through sliding mode variable structure controller, and enhances the system. Robustness, reduced DC side charging time, improved APF compensation performance. The simulation results prove the correctness and feasibility of the control method.

关键词： Keywords-APF DC side voltage sliding mode variable structure new command current generating circuit dq rotating coordinates DC side accurate position finder variable structure control commands Control Methods sliding mode variable structure control capacitor voltage Inrush current charge time Voltage regulation

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A Research about A MIMO System Identification Algorithm Based on ANN Using Slide mode variable structure

A Research about A MIMO System Identification Algorithm Base...

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2011 China Control and Decision Conference(2011中国控制与决策会议 CCDC)

作者： Yahui Wang Peixin Cheng Zhifeng Xia Department of Automation Engineering Beijing University of Civil & Architecture Engineering Beijin China Architecture Design&Research Group Beijing 100044 China Beijing Forestry University Beijing 100083 China

Applying sliding mode variable structure control to train neural networks is proposed in this paper, which can not only increases learning rate but also improves the stability of neural-network. Furthermore, this method helps to promote the generalization capacity of neural-network. In order to improve the generalization ability, two sliding mode objective functions are designed based on previous researches for a new neural-network learning algorithm. Simulation analysis shows that the proposed algorithm increases the generalization ability and robustness of neural-network, meanwhile, enhances the identification accuracy.

关键词： MIMO System Identification sliding mode variable structure Neural-Network Generalization Ability

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Cooperative control strategy of trajectory tracking and driving stability for distributed-drive vehicles under extreme conditions

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CONTROL ENGINEERING PRACTICE 2024年 147卷

作者： Teng, Fei Wang, Junnian Jin, Liqiang Wang, Zhenyu Zhou, Zidong Liu, Zhe Jilin Univ Natl Key Lab Automot Chassis Integrat & Bion Changchun 130025 Peoples R China

Active chassis dynamics control has become increasingly important in recent years for achieving high-level automated driving of intelligent electric vehicles. To improve tracking performance of the commonly-used model predictive control (MPC) in extreme scenarios, such as emergency lane changing, an improved MPC motion stability controller (MPC_ISMC) based on sliding mode variable structure active steering control and differential torque yaw control is proposed. Firstly, an MPC-based trajectory tracking controller is designed to track the desired trajectory. Subsequently, active front-wheel steering (AFS) and direct yaw moment (DYC) controllers are designed by using the backstepping sliding mode variable structure and the adaptive supertwisting sliding mode variable structure, respectively. Moreover, a cooperative control law for the AFS and the DYC is formulated by the smooth switching function and intervention intensity factor with respect to vehicle stable state and trajectory tracking error. After that, a torque distribution scheme of four wheels is optimized to achieve the additional yaw moment target. Finally, the effectiveness of the proposed cooperative control strategy is validated using a hardware-in-the-loop platform. The results indicate that the proposed controller has better performance in trajectory tracking and vehicle stability under extreme conditions compared with traditional MPC and other methods.

关键词： Distributed -drive vehicles Trajectory tracking model predictive control sliding mode variable structure Stability control Cooperative control

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Stability and Suppression Study for Low-Frequency Oscillations in Network-Train System

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IEEE ACCESS 2020年 8卷 30575-30590页

作者： Yang, Shaobing Wang, Yingchen Song, Kejian Wu, Mingli Konstantinou, Georgios Beijing Jiaotong Univ Sch Elect Engn Beijing 100044 Peoples R China Univ New South Wales Sch Elect Engn & Telecommun Sydney NSW 2052 Australia

Electric multiple units (EMUs) have been the cause of low frequency oscillation (LFO) incidents in high-speed railway (HSR) network train systems (NTSs). In this paper a norm criterion with the advantages of simpler calculation while being less conservative than other norm criteria is introduced to analyze the stability of the NTS. A control strategy of EMU four-quadrant converters (4QCs) consisting of ac current passivity-based control (PBC) and dc voltage sliding mode variable structure (SMS) control, i.e. PBC-SMS, is proposed for LFO suppression. The NTS stability analysis with PBC-SMS results in superior critical LFO condition. A single EMU simulation validates the improved steady-state and dynamic performance of the PBC-SMS compared to other conventional methods;NTS simulations based on field tested network parameters verify the superior LFO suppression capability of the proposed method. Finally, guidelines for LFO suppression are recommended based on a comprehensive sensitivity analysis of the traction network, 4QC circuit and controller parameters of an NTS.

关键词： High-speed railways low-frequency oscillation network-train system passivity-based control sliding mode variable structure stability analysis sensitivity analysis

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Efficiency Optimization of Asynchronism Motor Based on a Novel Reaching Law

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JOURNAL OF COMPUTERS 2013年第4期8卷 884-887页

作者： Miao, Jing-li Huang, Yuan Hebei Univ Engn Sch Informat & Elect Engn Handan Peoples R China

To satisfy with the high-power control of the asynchronism motor control drive system, this paper devised a novel reaching law of sliding mode variable structure control strategy and analysed this control strategy for vector control system of asynchronism motor and the high-frequency chattering phenomenon in traditional sliding mode controllers. The simulation results demonstrate that the control strategy can ensure rapid dynamic speed response during the efficiency optimization at low loads and decrease chattering phenomenon effectively, greatly improve the robustness of asynchronism motor and improve control quality.

关键词： asynchronism motor sliding mode variable structure chattering efficiency optimization

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Active magnetic bearing system based on sliding mode control

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modeRN PHYSICS LETTERS B 2017年第19-21期31卷

作者： Zhang, Yanhong Changzhou Inst Technol Sch Elect & Photoelect Engn 666 Liaohe Rd Changzhou 213000 Jiangsu Peoples R China Jiangsu Univ Sch Elect & Informat Engn 301 Xuefu Rd Zhenjiang 212013 Jiangsu Peoples R China

A new sliding mode variable structure control algorithm suitable for active magnetic bearing is proposed, which is widely used for nonlinear control system. The model and controller is designed, simulation and experimental parts are also made, according to the switching function and the sliding mode control law. The current of electromagnet is adjusted to realize stab lelevitation of the rotor. The experimental result shows that the sliding mode variable structure controller is an effective way for magnetic bearing control, and the active magnetic bearing system is a highly nonlinear and advanced control method that can reduce the setting time and the cost.

关键词： sliding mode variable structure active magnetic levitation nonlinear control system switching function performance index

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Coordinated control of sliding mode and Hamiltonian for PWM rectifier

Coordinated control of sliding mode and Hamiltonian for PWM ...

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Chinese Automation Congress (CAC)

作者： Yan, GuoJun Yu, HaiSheng Qingdao Univ Coll Automat & Engn Qingdao Peoples R China

ISBN: (纸本)9781538635247

Aiming at the problems of Mill rectifier control strategy of sliding mode control, steady state performance weak Hamiltonian control dynamic tracking performance is poor, this paper proposed a coordinated compound control, feedback linearization controller and sliding mode controller Hamiltonian system is obtained, and the design of a coordinated control strategy. In order to verify the accuracy of this method, cilatlab/Simulink is used for simulation analysis. The simulation results show that the composite control can achieve the coordinated dynamic rapid tracking and constant DC output and unit power factor operation, and satisfy the control requirements of the rectifier, effectively reducing the disturbance effect on the system. Compared with Hamiltonian control, the proposed method combines the advantages of the two methods, which have the fast tracking performance and excellent steady-state characteristics. The research prospect is broad

关键词： PWM rectifier Hamiltonian control sliding mode variable structure feedback linearization coordinated control

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