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Journal articles on the topic 'Power rate sliding mode control'
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1
Adamiak, Katarzyna, and Andrzej Bartoszewicz. "Novel Power-Rate Reaching Law for Quasi-Sliding Mode Control." Energies 15, no. 15 (2022): 5446. http://dx.doi.org/10.3390/en15155446.
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This study elaborates on the quasi-sliding mode control design for discrete time dynamical systems subject to matched external disturbances and modeling uncertainties. In order to provide finite time convergence to the sliding surface and at the same time restrict the control effort, we propose a novel power-rate reaching law utilizing a hyperbolic tangent function. The construction of the reaching law ensures that when the distance between the representative point of the system and the sliding surface is significant then the convergence pace is limited, which results in a reduced control effort. However, as the representative point of the system approaches the sliding surface, the convergence pace increases. Moreover, the study adopts a non-switching-type definition of the sliding motion, which eliminates undesirable chattering effects in the sliding phase. In order to reduce the impact of external disturbances on the system, the model following approach is taken, which allows for the rejection of all but the last disturbance value.
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Elaguab, Mohamed, and Thameur Obeidi. "Evaluating the performance of reaching laws in the sliding mode control of the Unified Power Flow Controller (UPFC)." STUDIES IN ENGINEERING AND EXACT SCIENCES 5, no. 2 (2024): e8994. http://dx.doi.org/10.54021/seesv5n2-320.
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This paper evaluates reaching laws in sliding mode control (SMC), encompassing constant rate, exponential, and power rate reaching laws. The performance of the proposed controller is assessed using a Unified Power Flow Controller (UPFC) as the test subject. The Unified Power Flow Controller system is in order to improve the stability of a power system hence providing security under increased power flow conditions. The sliding mode control, utilizing reaching laws, is designed to ensure the Unified Power Flow Controller system closely follows the reference power. Comparative simulation results with a traditional PID controller demonstrate superior performance with sliding mode control. Specifically, the sliding mode control Reaching law with power rate effectively controls the Unified Power Flow Controller system for active power, Various simulations have given very satisfactory results and we have successfully improved the active and reactive power flows on a line of transmission. achieving an overshoot of approximately 0.5411%, with a setting time of 0.1009 seconds and a rising time of 4.0720*10^-4 seconds.
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Zhang, Yan, Ya-Jun Wang, and Jia-Qi Yu. "A Novel MPPT Algorithm for Photovoltaic Systems Based on Improved Sliding Mode Control." Electronics 11, no. 15 (2022): 2421. http://dx.doi.org/10.3390/electronics11152421.
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Due to the poor tracking performance and significant chattering of traditional sliding mode control in the maximum power point tracking (MPPT) algorithm, a novel MPPT algorithm based on sliding mode control for photovoltaic systems is proposed in this paper. The sliding mode control structure and new sliding mode surface of the multi-power reaching law are designed with the boost converter as the carrier of the photovoltaic system, and the sigmoid function is proposed to replace the symbolic function and saturation function in the power reaching law to improve the reaching rate and control quality of the traditional sliding mode control. Furthermore, the Liapunov function is employed to analyze the accessibility, existence and stability of the improved sliding mode control. Simulation results under dynamic and partial shading conditions show that compared with exponential sliding mode and constant speed sliding mode, the improved sliding mode control strategy can quickly track the maximum power point of photovoltaic systems under various atmospheric conditions. The proposed MPPT algorithm has stronger robustness and universality. Additionally, the efficiency of the proposed algorithm is improved by 2.3% and 5.6% as compared to the exponential sliding model control algorithm and constant velocity sliding model control algorithm. In addition, the experimental platform is constructed to further validate the feasibility and effectiveness of the proposed algorithm.
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Xu, Yaru, Rong Liu, Jia Liu, and Jiancheng Zhang. "A novel constraint tracking control with sliding mode control for industrial robots." International Journal of Advanced Robotic Systems 18, no. 4 (2021): 172988142110297. http://dx.doi.org/10.1177/17298814211029778.
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As industrial robots are characterized by flexibility, load variation, and unknown interference, it is necessary to develop a control strategy with strong robustness and adaptability, fast convergence rate, and simple structure. Sliding mode control is a special method widely used to handle nonlinear robot control. However, the existing control law for sliding mode control has limitations in the chattering and convergence rate. The sliding mode manifold and reaching law are firstly discussed in this article. In the meanwhile, a proposed control law for sliding mode control combining linear sliding mode manifold and double-power reaching law is developed, which is based on the robot dynamic equation derived by the Udwadia–Kalaba theory. Furthermore, a compared control law for sliding mode control combining linear sliding mode manifold with exponential reaching law is presented to test the proposed control law for sliding mode control. The comparison indicates that the proposed law effectively improves the performance in convergence rate and the chattering of constraint tracking control. Finally, the two control laws for sliding mode control are applied to the Selective Compliance Articulated Robot Arm robot system with modeling error and uncertain external disturbance to demonstrate the merit and validation of the proposed scheme.
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Xu, Feng, Na An, Jianlin Mao, and Shubo Yang. "A New Variable Exponential Power Reaching Law of Complementary Terminal Sliding Mode Control." Complexity 2020 (October 8, 2020): 1–11. http://dx.doi.org/10.1155/2020/8874813.
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In this article, a new nonlinear algorithm based on the sliding mode control is developed for the ball and plate control system to improve dynamic response and steady-state tracking accuracy of the control system. First, a new sliding mode reaching law is proposed, variable exponential power reaching law (VEPRL), which is expressed in two different forms including a nonlinear combination function term and a variable exponential power term, so that it can be adjusted adaptively according to the state of the system by the variable exponential power reaching term during the reaching process. The computation results show that it can not only effectively weaken the chattering phenomenon but also increase the rate of the system state reaching to the sliding mode surface. Moreover, it has the characteristic of global finite-time convergence. Besides, a complementary terminal sliding mode control (CTSMC) method is designed by combining the integral terminal sliding surface with the complementary sliding surface to improve the convergence rate. Based on the proposed VEPRL and CTSMC, a new sliding mode control method for the ball and plate system is presented. Finally, simulation results show the superiority and effectiveness of the proposed control method.
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Chen, Yuepeng, Aiyi Li, Hui Li, Xu Yang, and Wei Chen. "Sensorless Control Method for SPMSMs Based on Improved Sliding Mode Reaching Rate." Electronics 12, no. 17 (2023): 3720. http://dx.doi.org/10.3390/electronics12173720.
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Due to the advantages of simple structure, small size, and high power density, permanent magnet synchronous motors (PMSM) have attracted the research interest of many scholars both domestically and abroad. However, traditional PMSM equipped with sensors, encoders, and other devices tend to have high equipment costs and rely heavily on the accuracy of the sensors for control effectiveness. Therefore, sensorless control has become a hot trend in the PMSM control field. In response to the chattering problem in sliding mode algorithms, this study first optimized the sliding mode reaching rate of a sensorless control system and applied it to construct a sliding mode observer and speed controller. Next, the improved sliding mode reaching rate-based sensorless control system was modeled and simulated in Matlab/Simulink, and its control performance was compared and analyzed with that of the traditional sliding mode reaching rate and replicated sliding mode reaching rate. Finally, comparative experiments were conducted on a test bench, and the results showed that, under the action of the improved sliding mode reaching rate, the chattering range of the output speed of the motor was +2%~+5%, which optimized the output speed of the PMSM and achieved the purpose of weakening the chattering.
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Saif, Sinan, Fareh Raouf, Hamdan Sadeque, Saad Maarouf, and Bettayeb Maamar. "Modified power rate sliding mode control for robot manipulator based on particle swarm optimization." IAES International Journal of Robotics and Automation (IJRA) 11, no. 2 (2022): 168–80. https://doi.org/10.11591/ijra.v11i2.pp168-180.
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This work suggests an optimized improved power rate sliding mode control (PRSMC) to control a 4-degrees of freedom (DOF) manipulator in joint space as well as workspace. The proposed sliding mode control (SMC) aims to improve the reaching mode and to employ an optimization method to tune the control parameters that operate the robotic manipulator adaptively. Inverse kinematics is used to obtain the joint desired angles from the end effector desired position, while forward kinematics is used to obtain the real Cartesian position and orientation of the end effector from the real joint angles. The proposed enhancements to the SMC involve the use of the hyperbolic tangent function in the control law to improve the reaching mode. Added to that, particle swarm optimization (PSO) is used to tune the parameters of the improved SMC. Furthermore, the Lyapunov function is utilized to analyze the stability of the closed-loop system. The proposed enhanced sliding mode combined with the optimization method is applied experimentally on a 4-DOF manipulator to prove the feasibility and efficiency of the proposed controller. Finally, the performance of the suggested control scheme is compared with the conventional power rate SMC in order to demonstrate the enhanced performance of the suggested method.
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Wang, Tao, Shenhui Chen, Xin Li, Jihui Zhang, and Jinghao Ma. "Direct Power Control of Vienna Rectifier Based on Fractional Order Sliding Mode Control." World Electric Vehicle Journal 15, no. 12 (2024): 543. http://dx.doi.org/10.3390/wevj15120543.
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Taking a Vienna rectifier as the research object, the power mathematical model based on a switching function is established according to its working principle. A sliding mode variable structure control algorithm based on the reaching law is examined in order to address the issues of the slow response speed and inadequate anti-interference of classical PI control in the face of abrupt changes in the DC-side load. In response to the sluggish convergence rate and inadequate chattering suppression of classical integer order sliding mode control, a fractional order exponential reaching law sliding mode, direct power control approach with rapid convergence is developed. The fractional calculus is introduced into the sliding mode control, and the dynamic performance and convergence speed of the control system are improved by increasing the degree of freedom of the fractional calculus operator. The method of including a balance factor in the zero-sequence component is employed to address the issue of the midpoint potential equilibrium in the Vienna rectifier. Ultimately, the suggested control is evaluated against classical PI control through simulation analysis and experimental validation. The findings indicate that the proposed technique exhibits rapid convergence, reduced control duration, and enhanced robustness, hence augmenting its resistance to interference.
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Wang, Yaobin, Tao Zhang, and Pengpeng Hou. "Research on Super-Twisting Sliding Mode Voltage Regulation Control of Electric Spring." International Journal of Mechanical and Electrical Engineering 2, no. 1 (2024): 60–71. http://dx.doi.org/10.62051/ijmee.v2n1.08.
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The traditional control of electric spring (ES) is too complex and lack of robustness, as well as the chattering phenomenon and control accuracy of traditional sliding mode control, a second-order terminal sliding mode control based on super twisting algorithm is proposed. In this paper, the phase plane method is used to establish the mathematical model of ES, solve the state space equation, and regard the AC power supply as a simplified error analysis. Then a second-order sliding mode controller is proposed. The controller parameters are solved to obtain the second-order sliding mode control rate, and the stability is verified. Finally, three groups of comparative simulation experiments were set up by Matlab/Simulink, and the effectiveness of the model was verified by considering the voltage mutation caused by the change of power supply and circuit parameters. Compared with the traditional control method, the proposed control strategy not only ensures the voltage stability, but also improves the control accuracy and the performance of suppressing sliding mode chattering, and has better dynamic response ability.
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Li, Xuemin, Yufei Liu, Haoyu Shu, Runzhi Wang, Yunlong Yang, and Chunyue Feng. "Disturbance Observer-Based Discrete Sliding-Mode Control for a Marine Diesel Engine with Variable Sampling Control Technique." Journal of Control Science and Engineering 2020 (July 4, 2020): 1–17. http://dx.doi.org/10.1155/2020/2456850.
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This paper proposes a disturbance observer-based discrete sliding-mode control scheme with the variable sampling rate control for the marine diesel engine speed control in the presence of system uncertainties and disturbances. Initially, a sliding-mode controller based on the fast power reaching law is employed, which has a good dynamic quality of the arrival stage and can suppress chattering. To satisfy the practical requirements in the digital controller and the crank angle-based fuel injection in engine speed control, the proposed method is discretized under the variable sampling rate condition. A disturbance observer based on the second-order sliding-mode control is designed to compensate the system uncertainties and disturbances, by doing such the requirement of the parameters of the sliding-mode controller to be reduced significantly. In addition, a cylinder-by-cylinder mean value engine model (MVEM) is built by restructuring the combustion torque model, based on which numerical simulations are carried out by comparing the proposed method with PID and the extended state observer (ESO)-based sliding mode controllers. The common operation situations of the marine diesel engines are taken into account, including starting process, acceleration and deceleration, load variation, and varied propulsion system parameters. The results demonstrate that the proposed disturbance observer-based sliding-mode controller has prominent control performance and strong robustness.
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Fan, Yong Hua, Peng Peng Yan, Fan Wang, and Hong Yang Xu. "Discrete Sliding Mode Control for Hypersonic Cruise Missile." Discrete Dynamics in Nature and Society 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/2402794.
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A discrete variable structure control (DVSC) with sliding vector is presented to track the velocity and acceleration command for a hypersonic cruise missile. In the design an integrator is augmented to ensure the tracking with zero steady-state errors. Furthermore the sliding surface of acceleration is designed using the error of acceleration and acceleration rate to avoid the singularity of control matrix. A proper power rate reaching law is utilized in this proposal; therefore the state trajectory from any initial point can be driven into the sliding surface. Besides, in order to validate the robustness of controller, the unmolded dynamic and parameter disturbance of the missile are considered. Through simulation the proposed controller demonstrates good performance in tracking velocity and acceleration command.
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Bai, Jing, Shi Qi Lu, and Jian Liu. "Study and Application of Sliding Mode Control Strategy for High-Power Current Source Inverter." Applied Mechanics and Materials 527 (February 2014): 259–66. http://dx.doi.org/10.4028/www.scientific.net/amm.527.259.
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For high-power current source inverter work object is a nonlinear time-varying systems, which could easily lead to the inverter voltage and current output waveform distortion, this paper firstly proposes a new variable-rate reaching sliding mode control scheme to solve the above problems existing in current source inverter system. In this scheme, we construct the variable structure model of the system, determine the sliding surface, give the variable-rate reaching control law and deduce the sliding domain. At last, the simulation result proves the validity and superiority of the scheme.
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Oualah, O., D. Kerdoun, and A. Boumassata. "Super-twisting sliding mode control for brushless doubly fed reluctance generator based on wind energy conversion system." Electrical Engineering & Electromechanics, no. 2 (March 5, 2023): 86–92. http://dx.doi.org/10.20998/2074-272x.2023.2.13.
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Introduction. Recently, wind power generation has grown at an alarming rate in the past decade and will continue to do so as power electronic technology continues to advance. Purpose. Super-twisting sliding mode control for brushless doubly-fed reluctance generator based on wind energy conversion system. Methods. This paper deals with the robust power control of a grid-connected brushless doubly-fed reluctance generator driven by the variable speed wind turbine using a variable structure control theory called sliding mode control. The traditional sliding mode approach produces an unpleasant chattering phenomenon that could harm the system. To eliminate chattering, it is necessary to employ a high-order sliding mode controller. The super-twisting algorithm is one type of nonlinear control presented in order to ensure the effectiveness of the control structure we tested these controllers in two different ways reference tracking, and robustness. Results. Simulation results using MATLAB/Simulink have demonstrated the effectiveness and robustness of the super-twisting sliding mode controller.
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Sinan, Saif, Raouf Fareh, Sadeque Hamdan, Maarouf Saad та Maamar Bettayeb. "Modified power rate sliding mode control for robot manipulator based on particle swarm optimization". IAES International Journal of Robotics and Automation (IJRA) 11, № 2 (2022): 168. http://dx.doi.org/10.11591/ijra.v11i2.pp168-180.
Full textAbstract:
This work suggests an optimized improved power rate sliding mode control (PRSMC) to control a 4-degrees of freedom (DOF) manipulator in joint space as well as workspace. The proposed sliding mode control (SMC) aims to improve the reaching mode and to employ an optimization method to tune the control parameters that operate the robotic manipulator adaptively. Inverse kinematics is used to obtain the joint desired angles from the end effector desired position, while forward kinematics is used to obtain the real Cartesian position and orientation of the end effector from the real joint angles. The proposed enhancements to the SMC involve the use of the hyperbolic tangent function in the control law to improve the reaching mode. Added to that, particle swarm optimization (PSO) is used to tune the parameters of the improved SMC. Furthermore, the Lyapunov function is utilized to analyze the stability of the closed-loop system. The proposed enhanced sliding mode combined with the optimization method is applied experimentally on a 4-DOF manipulator to prove the feasibility and efficiency of the proposed controller. Finally, the performance of the suggested control scheme is compared with the conventional power rate SMC in order to demonstrate the enhanced performance of the suggested method.
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Chen, Ziyi, and Guochu Chen. "Research on the current control method of PMSM based on the improved sliding mode controller." Journal of Physics: Conference Series 2477, no. 1 (2023): 012093. http://dx.doi.org/10.1088/1742-6596/2477/1/012093.
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Abstract Times are changing with each passing day, and permanent magnet synchronous motors are becoming popular in the new energy industry on account of its power consumption conversion rate is the same, its pollution is relatively small. For the problems of Buffeting and error when the system reaches stability vector control of PMSM, paper researches and tenders a kind of vector control based on a double power sliding mode permanent magnet motor. First, the traditional PI controller is replaced by a modified convergence-law sliding mode control in the current loop to improve overshoot and sliding mode jitter, new system stability is determined using Lyapunov function. Finally, simulation system in MATLAB/simulink is built, and the double-power sliding mode approach law, common sliding mode approach law, and PI control are compared and verified, and the waveforms of the three methods are compared. Paper, method of double power reaching law is used to track and control the current loop, the innovation point is that the double exponential law of approach, its advantage in (1) compared with other general convergence speed law of approach of sliding mode control(SMC) for faster relative to the general SMC (2) the steady-state error is smaller, effectively prevent the chattering.
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Iyer, Ajay G., Jagannath Samantaray, Samsaptak Ghosh, Arnab Dey, and Sohom Chakrabarty. "Sliding Mode Control Using Power Rate Exponential Reaching Law for Urban Platooning." IFAC-PapersOnLine 55, no. 1 (2022): 516–21. http://dx.doi.org/10.1016/j.ifacol.2022.04.085.
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K. B., Devika, and Susy Thomas. "Power rate exponential reaching law for enhanced performance of sliding mode control." International Journal of Control, Automation and Systems 15, no. 6 (2017): 2636–45. http://dx.doi.org/10.1007/s12555-016-0736-9.
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O., Oualah, Kerdoun D., and Boumassata A. "Super-twisting sliding mode control for brushless doubly fed reluctance generator based on wind energy conversion system." Electrical Engineering & Electromechanics, no. 2 (March 5, 2023): 86–92. https://doi.org/10.20998/2074-272X.2023.2.13.
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<strong><em>Introduction. </em></strong><em>Recently, wind power generation has grown at an alarming rate in the past decade and will continue to do so as power electronic technology continues to advance. <strong>Purpose. </strong>Super-twisting sliding mode control for brushless doubly-fed reluctance generator based on wind energy conversion system.</em><strong> <em>Methods.</em></strong> <em>This paper deals with the robust power control of a grid-connected brushless doubly-fed reluctance generator driven by the variable speed wind turbine using a variable structure control theory called sliding mode control.</em> <em>The traditional sliding mode approach produces an unpleasant chattering phenomenon that could harm the system. To eliminate chattering, it is necessary to employ a high-order sliding mode controller. The super-twisting algorithm is one type of nonlinear control presented in order to ensure the effectiveness of the control structure we tested these controllers in two different ways reference tracking, and robustness</em>.<strong><em> Results.</em></strong> <em>Simulation results using MATLAB/Simulink have demonstrated the effectiveness and robustness of the super-twisting sliding mode controller.</em>
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Rohith, G. "Fractional power rate reaching law for augmented sliding mode performance." Journal of the Franklin Institute 358, no. 1 (2021): 856–76. http://dx.doi.org/10.1016/j.jfranklin.2020.11.018.
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Sharoon, Aziz Choudhary, and Deena Lodwal Yadav Dr. "Exploring Observer-Based Sliding Mode Control for Nonlinear and Uncertain Systems: A Comprehensive Review." International Journal of Innovative Science and Research Technology 8, no. 5 (2023): 137–46. https://doi.org/10.5281/zenodo.7931663.
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Sliding modes control allow for finite-time convergence, precise retention of constraint and robustness against internal and external disturbances. First order sliding mode control demonstrates finite time convergence and robustness against disturbances and uncertainties but exhibits higher frequency switching in control signal which is not desirable from practically design point of view. It is minimized by using quasi stable sliding mode control. In this method signum function is approximated as sigmoid function which reduces the chattering in control signal but with loss of robustness property. In order to maintain the robustness property of controller with chattering free control signal an integral higher order sliding mode control is used. In this thesis the design of higher order sliding mode observer-based integral higher order sliding mode controller for load frequency problems in multi area power system. This method is proposed to estimate all states without the use of costly sensors, results in reduces the cost of overall system with consideration of various types of certain and uncertain disturbances leads to design of overall system more practically and economically. To reduce the mathematical discrepancy between system and mathematical model, Exogenous and Brownian white noise as stochastic perturbation along with uncertain load disturbance is considered. In practice, uneven and abnormal disturbance which are often unpredictable in multi area power system is also taken into consideration. The said design ensures finite time convergence of frequency and area control error under above said disturbances with chattering free control signal. Higher order sliding mode observer estimates all the system states which are difficult to measure or are unavailable. The frequency deviation is found to be within acceptable range under random load disturbance and matched uncertainty confirming robustness of the said design. Further, performance is also observed with power system nonlinearities like generation rate constraints and dead band. The result of proposed method is validated using simulation in MATLAB 2013b.
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FENG, Jiaqing, Lei ZHANG, and Dongyu TIAN. "Integrated sliding mode control of robot manipulator based on fuzzy adaptive RBF." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 42, no. 6 (2024): 1099–110. https://doi.org/10.1051/jnwpu/20244261099.
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To solve the uncertainty of the parameters of the manipulator dynamics model, the control accuracy and convergence rate of the system affected by the joint friction and external interference, a compound control strategy based on the manipulator dynamics model is proposed. Firstly, a modified power-of-two convergence law is used and combined with an integral sliding mode to design a sliding mode control term to shorten the convergence of the tracking error. Secondly, the approximations of the uncertain variables of the dynamical model are accomplished by using the three sets of RBF neural networks and introducing an adaptive mechanism for online self-tuning of weights, the approximation errors of the RBF neural networks are compensated by using the sliding-mode control term designed in the previous section. Finally, the fuzzy controllers are utilized to calculate the coupled joint friction and outside disturbances. The simulation works show that comparing with the chunked RBF neural network to approximate the sliding mode control logy, the proposed hybrid control theory reduces the mechanical arm joint angular rate response time by 39.4%, the largest solid-state error was cut by 76.8%, and the medium-sized solid-state error was cut by 62.7%, improved control preciseness and the responsiveness of the spatial trajectory tracking of the manipulator arm's joints.
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Gad, Omar Mohamed, Raouf Fareh, Hissam Tawfik, Saif Sinan, Sofiane Khadraoui, and Maamar Bettayeb. "Optimized Power Rate Sliding Mode Control for a Robot Manipulator Using Genetic Algorithms." International Journal of Control, Automation and Systems 22, no. 10 (2024): 3166–76. http://dx.doi.org/10.1007/s12555-024-0187-5.
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Wu, Qin, Shunqian Zhou, and Xinglian Wang. "Research on Global Nonsingular Fast Terminal Sliding Mode Control Strategy of Ball Screw Feed System Based on Improved Double Power Reaching Law." Actuators 13, no. 10 (2024): 423. http://dx.doi.org/10.3390/act13100423.
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Aiming at the problems of low trajectory tracking accuracy, serious chattering and poor robust performance of ball screw feed systems in traditional sliding mode control (SMC), in this paper, a global nonsingular fast terminal sliding mode control (GNFTSMC) strategy based on improved double power reaching law (DPRL) and extended state observer (ESO) is proposed. Firstly, the system state variable is introduced into the power term of DPRL, so that the improved DPRL has the characteristics of variable speed reaching, which solves the contradiction between the reaching rate and the sliding mode chattering. Secondly, ESO is designed to observe the state of the system and match the external disturbance to improve the anti-interference performance of the system. Finally, GNFTSMC is designed for the ball screw feed system, and the global sliding mode factor is introduced to improve the trajectory tracking accuracy of the system. The results show that the proposed control strategy can effectively improve the tracking accuracy and anti-interference performance of the system.
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Samba, Aime Herv ´. e´, Tamtsia Aurelien Yeremou, and Nneme Leandre Nneme. "Performance evaluation of industrial ethernet protocols for real-time fault detection based adaptive observer in networked control systems with network communication constraints." IAES International Journal of Robotics and Automation (IJRA) 10, no. 3 (2021): 261–74. https://doi.org/10.11591/ijra.v10i3.pp261-274.
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In this paper, the performance evaluation of industrial ethernet (EtherNet/IP, EtherCAT and PROFINET IRT) networks has been studied for choosing the right protocol in real-time fault detection based adaptive sliding mode observer in networked control systems (NCSs) under time network-induced delays, stochastic packet losses, access constraints and bounded disturbances. An adaptive sliding-mode observer based fault detection is presented. The dynamic hydroelectric power plant model is used to verify the effectiveness of the proposed method based on TrueTime and Matlab/ Simulink, corroborated our predictions that an ethernet for control automation technology (EtherCAT) protocol would be more appropriate to reduce the false alarm rate and increasing the efficiency of the remote control of industrial hydroelectric power plant.
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Mehta, Utkal, and İbrahim Kaya. "Smith predictor with sliding mode control for processes with large dead times." Journal of Electrical Engineering 68, no. 6 (2017): 463–69. http://dx.doi.org/10.1515/jee-2017-0081.
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AbstractThe paper discusses the Smith Predictor scheme with Sliding Mode Controller (SP-SMC) for processes with large dead times. This technique gives improved load-disturbance rejection with optimum input control signal variations. A power rate reaching law is incorporated in the sporadic part of sliding mode control such that the overall performance recovers meaningfully. The proposed scheme obtains parameter values by satisfying a new performance index which is based on biobjective constraint. In simulation study, the efficiency of the method is evaluated for robustness and transient performance over reported techniques.
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Yang, Jiahao, Xiangguo Li, and Juntao Fei. "Intelligent Global Fast Terminal Sliding Mode Control of Active Power Filter." Mathematics 11, no. 4 (2023): 919. http://dx.doi.org/10.3390/math11040919.
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Faced with serious harmonic pollution, a global fast terminal sliding mode control (GFTSMC) based on a novel recurrent fuzzy neural network (NRFNN) strategy for an active power filter (APF) with uncertainty is proposed in this article, which is aimed at improving the power quality and realizing harmonic suppression. First, the GFTSMC is adopted due to its advantages in finite-time convergence and faster convergence rate of tracking error in the system. Second, NRFNN is adopted to approximate the unknown model and lump the uncertainty of the APF system. Because the values of base width, center vector and feedback gain of NRFNN can be adjusted adaptively according to adaptive laws, the accurate approximation of the unknown model can be achieved, and the robustness and accuracy of the APF system can be guaranteed. Finally, the validity and feasibility of the proposed GFTSMC-NRFNN scheme is fully verified by simulation results, showing it has better steady-state and dynamic performance than other existing methods.
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Herve, SAMBA Aime, Yeremou Tamtsia Aurelien, and Nneme Nneme Leandre. "Performance evaluation of industrial ethernet protocols for real-time fault detection based adaptive observer in networked control systems with network communication constraints." IAES International Journal of Robotics and Automation (IJRA) 10, no. 3 (2021): 261. http://dx.doi.org/10.11591/ijra.v10i3.pp261-274.
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<p>In this paper, the performance evaluation of industrial ethernet (EtherNet/IP, EtherCAT and PROFINET IRT) networks has been studied for choosing the right protocol in real-time fault detection based adaptive sliding mode observer in networked control systems (NCSs) under time network-induced delays, stochastic packet losses, access constraints and bounded disturbances. An adaptive sliding-mode observer based fault detection is presented. The dynamic hydroelectric power plant model is used to verify the effectiveness of the proposed method based on TrueTime and Matlab/ Simulink, corroborated our predictions that an ethernet for control automation technology (EtherCAT) protocol would be more appropriate to reduce the false alarm rate and increasing the efficiency of the remote control of industrial hydroelectric power plant.</p>
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Liu, Zhaoting, Xi Wang, Peng Zhou, et al. "Non-Singular Fast Terminal Composite Sliding Mode Control of Marine Permanent Magnet Synchronous Propulsion Motors." Machines 13, no. 6 (2025): 470. https://doi.org/10.3390/machines13060470.
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Regarding the high susceptibility problem of the Permanent Magnet Synchronous Motor (PMSM) to various uncertain factors, including load variations, parameter perturbations, and external interferences in the ship’s electric propulsion system, this paper presents a non-singular fast terminal composite sliding mode control (NFTCSMC) strategy based on the improved exponential reaching law. This strategy integrates the system’s state variables and the power function of the sliding mode surface into the traditional exponential reaching law, not only enhancing the sliding mode reaching rate but also effectively mitigating system chattering. Additionally, a sliding mode disturbance observer is developed to compensate for both internal and external disturbances in real time, further enhancing the system’s robustness. Finally, the proposed control strategy is experimentally validated using the rapid control prototyping (RCP) technology applied on a semi-physical experimental platform for ship electric propulsion. Experimental results indicate that, compared to traditional proportional–integral (PI), sliding mode control (SMC), and fast terminal sliding mode control (FTSMC) strategies, the NFTCSMC strategy enhances the propulsion and anti-interference capabilities of the propulsion motor, thereby improving the dynamic performance of the ship’s electric propulsion system.
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Aoumri, Mohammed, Ibrahim Yaichi, Abdelkader Harrouz, Brahim Berbaoui, and Seddik Baala. "Neural Sliding Mode Control of a permanent magnet synchronous generator PMSG integrated in a wind system." STUDIES IN ENGINEERING AND EXACT SCIENCES 5, no. 3 (2024): e12714. https://doi.org/10.54021/seesv5n3-070.
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This paper deals with the use of a Permanent Magnet Synchronous Generator (PMSG) for the production of wind energy and the injection of the energy produced into a power grid. The aim of this work is to improve the performance of the permanent magnet synchronous generator (PMSG) connected to the electrical grid. The sliding mode control (SMC) is part of the family of variable structure controllers, i.e. controls switching between several different control laws. This latter control induces in practice high frequency switching known as chattering. These switching can excite unwanted dynamics that risk destabilizing, deteriorating or even destroying the system studied. There are several methods to reduce this phenomenon, among these methods the combined sliding mode and neural control (NSMC). A comparative study between the classic (SMC) control and the proposed (NSMC) has been made. The classic SMC regulator gives rise to a wide band of oscillations of the power and current quantities, which results in a high harmonic rate (THD) compared to the NSMC control.
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Douanla, Rostand Marc, Godpromesse Kenné, François Béceau Pelap, and Armel Simo Fotso. "A Modified RBF Neuro-Sliding Mode Control Technique for a Grid Connected PMSG Based Variable Speed Wind Energy Conversion System." Journal of Control Science and Engineering 2018 (October 1, 2018): 1–19. http://dx.doi.org/10.1155/2018/1780634.
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A modified control scheme based on the combination of online trained neural network and sliding mode techniques is proposed to enhance maximum power extraction for a grid connected permanent magnet synchronous generator (PMSG) wind turbine system. The proposed control method does not need the knowledge of the uncertainty bounds nor the exact model of the nonlinear system. Since the neural network is trained online, the time to estimate good weights can affect the dynamic performance of the process during the startup phase. Therefore an appropriate way to smoothly and explicitly accelerate the neural network rate of convergence during the startup phase is proposed. Furthermore, a flexible grid side voltage source converter control structure which can handle both grid connected and standalone modes based on conventional proportional integral (PI) control method is presented. Simulations are done in Matlab/Simulink environment to verify the effectiveness and assess the performance of the proposed controller. The results analysis shows the superiority of the proposed RBF neuro-sliding mode controller compared to a nonlinear controller based on sliding mode control method when the system undergoes parameter uncertainties.
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Wang, Jiacheng, Yunmei Fang, and Juntao Fei. "Adaptive Super-Twisting Sliding Mode Control of Active Power Filter Using Interval Type-2-Fuzzy Neural Networks." Mathematics 11, no. 12 (2023): 2785. http://dx.doi.org/10.3390/math11122785.
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Aiming at the unknown uncertainty of an active power filter system in practical operation, combining the advantages of self-feedback structure, interval type-2 fuzzy neural network, and super-twisting sliding mode, an adaptive super-twisting sliding mode control method of interval type-2 fuzzy neural network with self-feedback recursive structure (IT2FNN-SFR STSMC) is proposed in this paper. IT2FNN has an uncertain membership function, which can enhance the nonlinear ability and robustness of the network. The historical information will be stored and utilized by the self-feedback recursive structure (SFR) at runtime. Therefore, the novel IT2FNN-SFR is designed to improve the dynamic approximation effect of the neural network and reduce the dependence of the controller on the actual mathematical model. The adaptive rate of each weight of the neural network is designed by the Lyapunov method and gradient descent (GD) algorithm to ensure the convergence and stability of the system. Super-twisting sliding mode control (STSMC) has strong robustness, which can effectively reduce system chattering, and improve control accuracy and system performance. The gain of the integral term in the STSMC is set as a constant, and the other gain is changed adaptively whose adaptive rate is deduced through the stability proof of the neural network, which greatly reduces the difficulty of parameter adjustment. The harmonic suppression ability of the designed control strategy is verified by simulation experiments.
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Alami, Houda El, Badre Bossoufi, Saad Motahhir, et al. "FPGA in the Loop Implementation for Observer Sliding Mode Control of DFIG-Generators for Wind Turbines." Electronics 11, no. 1 (2021): 116. http://dx.doi.org/10.3390/electronics11010116.
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This paper presents a new contribution of the nonlinear control technique of electrical energy in a wind energy system. The nonlinear sliding mode technique used to control the powers of the DFIG-Generator is connected to the power grid by two converters (grid side and machine side). The proposed model is validated using tracking and robustness tests with a real wind speed. The control was developed under Matlab/Simulink, and the FPGA in the Loop technique was used to design the DFIG model. By employing a co-simulation, the purpose is to test the controller for the FPGA simulated model or system in its entirety. The results obtained by the cο-simulation show the efficiency of the proposed model in terms of speed and robustness with a rate THD = 0.95, and the proposed model of the sliding mode controller shows a significant improvement in the quality of energy produced by the wind system.
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Zhao, Yu-Xin, Tian Wu, and Yan Ma. "A Double Power Reaching Law of Sliding Mode Control Based on Neural Network." Mathematical Problems in Engineering 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/408272.
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For discrete system, the reaching law election and controller design are two crucial and important problems. In this paper, an improved double power reaching law of SMC and a controller combined with neural network have been investigated. Theory proves that this method can eliminate the chattering and increase the reaching rate. Furthermore, when there is a certain external interference, the regulating function of neural network can ensure strong robustness of the system. Simulation results show that compared with exponential reaching law, single power reaching law, and traditional double power reaching law, the proposed reaching law has faster convergence speed and better dynamic performance.
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Elnady, A., and Mohammad AlShabi. "Advanced exponential sliding mode control for microgrid at autonomous and grid-connected modes." Bulletin of Electrical Engineering and Informatics 10, no. 1 (2021): 474–86. http://dx.doi.org/10.11591/eei.v10i1.2718.
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This paper introduces a novel control scheme for the operation of multilevel inverters forming a microgrid. The core of the suggested control scheme is an advanced (power-rate) exponential sliding mode controller. This developed controller is robust toward any variation of the system’s parameters and loads in addition to its fast and accurate performance. The presented control scheme provides advantageous characteristics to the microgrid operation in an autonomous mode (microgrid mode) and grid-connected mode. In the microgrid mode, the voltages and frequency are stable at any variable balanced and unbalanced load. In the grid-connected mode, an effective procedure for connecting the microgrid to the main grid is proposed to guarantee a seamless and fast transition to the grid-connected mode. The performance of the presented control scheme along with its proposed controller is validated by comparing its results to another linear and non-linear controllers for the same microgrid loading conditions.
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A., Elnady, and AlShabi Mohammad. "Advanced exponential sliding mode control for microgrid at autonomous and grid-connected modes." Bulletin of Electrical Engineering and Informatics 10, no. 1 (2021): 474–86. https://doi.org/10.11591/eei.v10i1.2718.
Full textAbstract:
This paper introduces a novel control scheme for the operation of multilevel inverters forming a microgrid. The core of the suggested control scheme is an advanced (power-rate) exponential sliding mode controller. This developed controller is robust toward any variation of the system’s parameters and loads in addition to its fast and accurate performance. The presented control scheme provides advantageous characteristics to the microgrid operation in an autonomous mode (microgrid mode) and grid-connected mode. In the microgrid mode, the voltages and frequency are stable at any variable balanced and unbalanced load. In the grid-connected mode, an effective procedure for connecting the microgrid to the main grid is proposed to guarantee a seamless and fast transition to the grid-connected mode. The performance of the presented control scheme along with its proposed controller is validated by comparing its results to another linear and non-linear controllers for the same microgrid loading conditions.
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Yue, Yaobin, Yanfeng Geng, and Weiliang Wang. "Continuous Nonsingular Fast Terminal Sliding Mode Control for Speed Tracking of PMSM Based on Finite Time Disturbance Observer." Processes 10, no. 7 (2022): 1407. http://dx.doi.org/10.3390/pr10071407.
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A continuous nonsingular fast terminal sliding mode (CNFTSM) control strategy with an automated double power reaching law is proposed to improve the performance of speed dynamic response and accuracy tracking for the permanent magnet synchronous motor (PMSM) servo system. In pursuit of robustness against system uncertainties, a finite-time convergent extended state observer (ESO) is designed to estimate external disturbances, parameter variation, and unmodeled dynamics as a feedforward compensation to the output feedback control system. The developed controller, based on Lyapunov stability theory analysis, can guarantee finite time stability from any initial state in the presence of internal and external disturbances. The modified sliding mode reaching law can achieve enough convergence rate compared with the exponential reaching law, and the inherent chattering of sliding mode is reduced when system states approach the equilibrium point. Theoretical analysis and simulation results demonstrate that the proposed composite controller can achieve higher performance than the conventional sliding mode method.
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Yin, Chun, YangQuan Chen, and Shou-ming Zhong. "Fractional-order power rate type reaching law for sliding mode control of uncertain nonlinear system." IFAC Proceedings Volumes 47, no. 3 (2014): 5369–74. http://dx.doi.org/10.3182/20140824-6-za-1003.01115.
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Yin, Zhilong, Shuilian Xue, Zhiguo Wang, Feng Yu, and Hailiang Chen. "Flexible Droop Coefficient-Based Inertia and Voltage Cascade Control for Isolated PV-Battery DC Microgrid." Energies 15, no. 24 (2022): 9318. http://dx.doi.org/10.3390/en15249318.
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To realize the coordinated distribution of power in the multi-source system, maintain the charging balance among energy storage units, and improve the anti-interference capability of the bus voltage, a cascade control for an isolated PV-battery DC microgrid is proposed in this paper. First, to provide inertia for the microgrid so that it can cope with external disturbance, the parameters of the droop curve were adjusted by correlating the bus voltage variation rate, which improved the conventional droop control. Secondly, a nonsingular terminal sliding mode control was proposed to track voltage and current references and, thus, enhance the robustness of the DC microgrid. Moreover, the high-frequency chattering of the sliding mode control was inhibited with the exponential reaching law, and the Lyapunov function was utilized to verify the stability of the proposed nonsingular terminal sliding mode control method. Both the simulated and experimental results verified the correctness and effectiveness of the proposed method.
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Chang, En-Chih. "High-Performance Pure Sine Wave Inverter with Robust Intelligent Sliding Mode Maximum Power Point Tracking for Photovoltaic Applications." Micromachines 11, no. 6 (2020): 585. http://dx.doi.org/10.3390/mi11060585.
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Photovoltaic (PV) power generation has been extensively used as a result of the limited petrochemical resources and the rise of environmental awareness. Nevertheless, PV arrays have a widespread range of voltage changes in a variety of solar radiation, load, and temperature circumstances, so a maximum power point tracking (MPPT) method must be applied to get maximum power from PV systems. Sliding mode control (SMC) is effectively used in PV power generation due to its robustness, design simplicity, and superior interference suppression. When the PV array is subject to large parameter changes/highly uncertain conditions, the SMC leads to degraded steady-state performance, poor transient tracking speed, and unwanted flutter. Therefore, this paper proposes a robust intelligent sliding mode MPPT-based high-performance pure sine wave inverter for PV applications. The robust SMC is designed through fast sliding regime, which provides fixed time convergence and a non-singularity that allows better response in steady-state and transience. To avoid the flutter caused by system unmodeled dynamics, an enhanced cuckoo optimization algorithm (ECOA) with automatically adjustable step factor and detection probability is used to search control parameters of the robust sliding mode, thus finding global optimal solutions. The coalescence of both robust SMC and ECOA can control the converter to obtain MPPT with faster convergence rate and without untimely trapping at local optimal solutions. Then the pure sine wave inverter with robust intelligent sliding mode MPPT of the PV system delivers a high-quality and stable sinusoidal wave voltage to the load. The efficacy of the proposed method is validated on a MPPT pure sine wave inverter system by using numerical simulations and experiments. The results show that the output of the proposed PV system can improve steady-state performance and transient tracking speed.
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Ma, Xingrui, and Jianning Lu. "Research on the new control strategy of the three-phase VIENNA rectifier." Journal of Physics: Conference Series 2876, no. 1 (2024): 012019. http://dx.doi.org/10.1088/1742-6596/2876/1/012019.
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Abstract The VIENNA rectifier has long been used in applications such as charging piles, and the theoretical research on its control strategy is enumerated. Compared with other circuit components, the VIENNA rectifier has fewer power components and a higher power factor, so it is applied to more application scenarios. The traditional PI control has a long start-up response time and a high overshoot, while the sliding mode control (SMC) has excellent control performance for nonlinear systems. In my article, the control mode of the VIENNA rectifier is analyzed mathematically, SMC takes controls of the current inner loop, and a new exponential reaching rate is put forward the at first improve the control process. Finally, a complete system simulation model is built to prove the superiority of the VIENNA rectifier based on an optimized SMC control strategy for each control target and the corresponding control strategy. The results show that the control effect is obviously optimized by using this method.
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Leśniewski, Piotr, and Andrzej Bartoszewicz. "Reaching Law Based Sliding Mode Control of Sampled Time Systems." Energies 14, no. 7 (2021): 1882. http://dx.doi.org/10.3390/en14071882.
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In this paper, discrete time reaching law-based sliding mode control of continuous time systems is considered. In sliding mode control methods, usually the assumption of bounded absolute values of disturbances is used. However in many cases, the rate of change of the disturbance is also bounded. In the presented approach, this knowledge is used to improve the control precision and reduce the undesirable chattering. Another advantage of the proposed method is that the disturbance does not have to satisfy the matching conditions. In the paper two new reaching laws are analyzed, one of them ensures the switching quasi-sliding motion and the other the non-switching motion. For both of them, the robustness is assessed by calculating the quasi-sliding mode band width, as well as the greatest possible state error values. Specifically, the state errors are not considered only at the sampling instants, as is usual for discrete time systems, but the bounds on the continuous values “between” the sampling instants are also derived. Then, the proposed approaches are compared and analyzed with respect to energy expenditure of the control signal.
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Pan, Huihui, and Guangming Zhang. "Novel Nonsingular Fast Terminal Sliding Mode Control for a Class of Second-Order Uncertain Nonlinear Systems." Mathematical Problems in Engineering 2021 (January 28, 2021): 1–18. http://dx.doi.org/10.1155/2021/8840244.
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This paper presents a novel nonsingular fast terminal sliding mode control scheme for a class of second-order uncertain nonlinear systems. First, a novel nonsingular fast terminal sliding mode manifold (NNFTSM) with adaptive coefficients is put forward, and a novel double power reaching law (NDP) with dynamic exponential power terms is presented. Afterwards, a novel nonsingular fast terminal sliding mode (NNFTSMNDP) controller is designed by employing NNFTSM and NDP, which can improve the convergence rate and the robustness of the system. Due to the existence of external disturbances and parameter uncertainties, the system states under controller NNFTSMNDP cannot converge to the equilibrium but only to the neighborhood of the equilibrium in finite time. Considering the unsatisfying performance of controller NNFTSMNDP, an adaptive disturbance observer (ADO) is employed to estimate the lumped disturbance that is compensated in the controller in real-time. A novel composite controller is presented by combining the NNFTSMNDP method with the ADO technique. The finite-time stability of the closed-loop system under the proposed control method is proven by virtue of the Lyapunov stability theory. Both simulation results and theoretical analysis illustrate that the proposed method shows excellent control performance in the existence of disturbances and uncertainties.
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Zhang, Quan-Quan, and Rong-Jong Wai. "Robust Power Sharing and Voltage Stabilization Control Structure via Sliding-Mode Technique in Islanded Micro-Grid." Energies 14, no. 4 (2021): 883. http://dx.doi.org/10.3390/en14040883.
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With a focus on the problems of active power sharing and voltage deviation of parallel-connected inverters in an islanded micro-grid (MG), in this study, the power-voltage droop controller and the inner voltage regulator are redesigned based on a total sliding-mode control (TSMC) technique. As for the power-voltage droop control loop, a droop control relation error between the active power and the point-of-common-coupling (PCC) voltage amplitude is defined. Then, the TSMC scheme is adopted to reach the new droop control relation, where the active power sharing and voltage amplitude recovery can be achieved simultaneously. Owing to the faster dynamic response and strong robustness provided by the TSMC framework, high-precision active power sharing during transient state also can be ensured without the influence of line impedances. The power allocation error can be improved by more than 81.2% and 50% than the conventional and proportional-integral (PI)-based droop control methods, respectively, and the voltage deviation rate can be reduced to 0.16%. Moreover, a small-signal model of the TSMC-based droop-controlled system is established, and the influences of control parameters on the system stability and the dynamic response are also investigated. The effectiveness of the proposed control method is verified by numerical simulations and experimental results.
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Liu, Qi, Jiahui Wu, Haiyun Wang, Hua Zhang, and Jian Yang. "Analysis of DFIG Interval Oscillation Based on Second-Order Sliding Film Damping Control." Energies 16, no. 7 (2023): 3091. http://dx.doi.org/10.3390/en16073091.
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This paper takes advantage of the high control flexibility and fast response time of the interfacing power electronic converter for doubly fed wind turbine grid-connected systems to address inter-area oscillations caused by inadequate system damping in power systems. A reactive-power-coordinated damping controller for a doubly fed induction generator (DFIG) is proposed, and it makes use of second-order sliding-mode technology. The suggested controller improves damping performance by controlling the reactive power. It provides benefits such as a quicker damping rate and resilience to modeling errors and parameter changes. The simulation results indicate the system’s improved performance in inter-area oscillation damping and the robustness of the suggested control technique over a broad range of functional areas.
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Jia, Yuxin, Weiting Liu, Haifeng Wei, and Yi Zhang. "Study of sliding mode weak magnetic control of built-in permanent magnet synchronous motor." Journal of Physics: Conference Series 2963, no. 1 (2025): 012018. https://doi.org/10.1088/1742-6596/2963/1/012018.
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Abstract A single current regulator weak magnet control method is proposed for built-in permanent magnet synchronous motors (IPMSM). To enhance the robustness, the method proposes a novel and improved dual-power convergent rate-integrated terminal sliding mode control (ITSMC) in the velocity outer loop of the single current regulator-variable q-axis voltage (SCR-VQV) weak magnet control strategy to replace the conventional PI control. Finally, the weak magnetic capability of the improved weak magnetic control algorithm with stabilized depth is verified on a MATLAB simulation platform.
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Maaruf, Muhammad, Md Shafiullah, Ali T. Al-Awami, and Fahad S. Al-Ismail. "Adaptive Nonsingular Fast Terminal Sliding Mode Control for Maximum Power Point Tracking of a WECS-PMSG." Sustainability 13, no. 23 (2021): 13427. http://dx.doi.org/10.3390/su132313427.
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This paper investigates maximum power extraction from a wind-energy-conversion system (WECS) with a permanent magnet synchronous generator (PMSG) operating in standalone mode. This was achieved by designing a robust adaptive nonsingular fast terminal sliding mode control (ANFTSMC) for the WECS-PMSG. The proposed scheme guaranteed optimal power generation and suppressed the system uncertainties with a rapid convergence rate. Moreover, it is independent of the upper bounds of the system uncertainties as an online adjustment algorithm was utilized to estimate and compensate them. Finally, four case studies were carried out, which manifested the remarkable performance of ANFTSMC in comparison to previous methods reported in the literature.
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A., Ibrar, Ahmad S., Safdar A., and Haroon N. "Efficiency enhancement strategy implementation in hybrid electric vehicles using sliding mode control." Electrical Engineering & Electromechanics, no. 1 (January 4, 2023): 10–19. https://doi.org/10.20998/2074-272X.2023.1.02.
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<strong><em>Introduction.</em></strong><em> Hybrid electric vehicles are offering the most economically viable choices in today's automotive industry, providing best solutions for a very high fuel economy and low rate of emissions. The rapid progress and development of this industry has prompted progress of human beings from primitive level to a very high industrial society where mobility used to be a fundamental need. However, the use of large number of automobiles is causing serious damage to our environment and human life. At present most of the vehicles are relying on burning of hydrocarbons in order to achieve power of propulsion to drive wheels. Therefore, there is a need to employ clean and efficient vehicles like hybrid electric vehicles. Unfortunately, earlier control strategies of series hybrid electric vehicle fail to include load disturbances during the vehicle operation and some of the variations of the nonlinear parameters (e.g. stator’s leakage inductance, resistance of winding etc.).</em> <em>The<strong> novelty</strong> of the proposed work is based on designing and implementing two robust sliding mode controllers (SMCs) on series hybrid electric vehicle to improve efficiency in terms of both speed and torque respectively. The basic idea is to let the engine operate only when necessary keeping in view the state of charge of battery. <strong>Purpose</strong>. In proposed scheme, both performance of engine and generator is being controlled, one sliding mode controllers is controlling engine speed and the other one is controlling generator torque, and results are then compared using 1-SMC and 2-SMC’s. <strong>Method.</strong> The series hybrid electric vehicle powertrain considered in this work consists of a battery bank and an engine-generator set which is referred to as the auxiliary power unit, traction motor, and power electronic circuits to drive the generator and traction motor. The general strategy is based on the operation of the engine in its optimal efficiency region by considering the battery state of charge. <strong>Results</strong> .Mathematical models of engine and generator were taken into consideration in order to design sliding mode controllers both for engine speed and generator torque control. Vehicle was being tested on standard cycle. Results proved that, instead of using only one controller for engine speed, much better results are achieved by simultaneously using two sliding mode controllers, one controlling engine speed and other controlling generator torque.</em>
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Xu, Jianliang, Zhen Sui, and Xiaohua Wei. "Singular Perturbation Decoupling and Composite Control Scheme for Hydraulically Driven Flexible Robotic Arms." Processes 13, no. 6 (2025): 1805. https://doi.org/10.3390/pr13061805.
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Hydraulically driven flexible robotic arms (HDFRAs) play an indispensable role in industrial precision operations such as aerospace assembly and nuclear waste handling, owing to their high power density and adaptability to complex environments. However, inherent mechanical flexibility-induced vibrations, hydraulic nonlinear dynamics, and electromechanical coupling effects lead to multi-timescale control challenges, severely limiting high-precision trajectory tracking performance. The present study introduces a novel hierarchical control framework employing dual-timescale perturbation analysis, which effectively addresses the constraints inherent in conventional single-timescale control approaches. First, the system is decoupled into three subsystems via dual perturbation parameters: a second-order rigid-body motion subsystem (SRS), a second-order flexible vibration subsystem (SFS), and a first-order hydraulic dynamic subsystem (FHS). For SRS/SFS, an adaptive fast terminal sliding mode active disturbance rejection controller (AFTSM-ADRC) is designed, featuring a dual-bandwidth extended state observer (BESO) to estimate parameter perturbations and unmodeled dynamics in real time. A novel reaching law with power-rate hybrid characteristics is developed to suppress sliding mode chattering while ensuring rapid convergence. For FHS, a sliding mode observer-integrated sliding mode coordinated controller (SMO-ISMCC) is proposed, achieving high-precision suppression of hydraulic pressure fluctuations through feedforward compensation of disturbance estimation and feedback integration of tracking errors. The globally asymptotically stable property of the composite system has been formally verified through systematic Lyapunov-based analysis. Through comprehensive simulations, the developed methodology demonstrates significant improvements over conventional ADRC and PID controllers, including (1) joint tracking precision reaching 10−4 rad level under nominal conditions and (2) over 40% attenuation of current oscillations when subjected to stochastic disturbances. These results validate its superiority in dynamic decoupling and strong disturbance rejection.
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Jiao, Junsheng. "Sliding Mode Control for Stabilizing of Boost Converter in a Solid Oxide Fuel Cell." Cybernetics and Information Technologies 13, no. 4 (2013): 139–47. http://dx.doi.org/10.2478/cait-2013-0060.
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Abstract The output voltage of Solid Oxide Fuel Cell (SOFC) is usually changed with the temperature and hydrogen flow rate. Since the fuel cell can generate a wide range of voltages and currents at the terminals, as a consequence, a constant DC voltage and function cannot be maintained by itself as a DC voltage power supply source. To solve this problem, a simple SOFC electrochemical model is introduced to control the output voltage. The Sliding Mode Control (SMC) is used to control the output voltage of the DC-DC converter for maintaining the constant DC voltage when the temperature and hydrogen flow rate are changed. By the simulation results it can be seen that the SMC technique has improved the transient response and reduced the steady state error of DC voltage.
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Ibrar, A., S. Ahmad, A. Safdar, and N. Haroon. "Efficiency enhancement strategy implementation in hybrid electric vehicles using sliding mode control." Electrical Engineering & Electromechanics, no. 1 (January 4, 2023): 10–19. http://dx.doi.org/10.20998/2074-272x.2023.1.02.
Full textAbstract:
Introduction. Hybrid electric vehicles are offering the most economically viable choices in today's automotive industry, providing best solutions for a very high fuel economy and low rate of emissions. The rapid progress and development of this industry has prompted progress of human beings from primitive level to a very high industrial society where mobility used to be a fundamental need. However, the use of large number of automobiles is causing serious damage to our environment and human life. At present most of the vehicles are relying on burning of hydrocarbons in order to achieve power of propulsion to drive wheels. Therefore, there is a need to employ clean and efficient vehicles like hybrid electric vehicles. Unfortunately, earlier control strategies of series hybrid electric vehicle fail to include load disturbances during the vehicle operation and some of the variations of the nonlinear parameters (e.g. stator’s leakage inductance, resistance of winding etc.). The novelty of the proposed work is based on designing and implementing two robust sliding mode controllers (SMCs) on series hybrid electric vehicle to improve efficiency in terms of both speed and torque respectively. The basic idea is to let the engine operate only when necessary keeping in view the state of charge of battery. Purpose. In proposed scheme, both performance of engine and generator is being controlled, one sliding mode controllers is controlling engine speed and the other one is controlling generator torque, and results are then compared using 1-SMC and 2-SMC’s. Method. The series hybrid electric vehicle powertrain considered in this work consists of a battery bank and an engine-generator set which is referred to as the auxiliary power unit, traction motor, and power electronic circuits to drive the generator and traction motor. The general strategy is based on the operation of the engine in its optimal efficiency region by considering the battery state of charge. Results .Mathematical models of engine and generator were taken into consideration in order to design sliding mode controllers both for engine speed and generator torque control. Vehicle was being tested on standard cycle. Results proved that, instead of using only one controller for engine speed, much better results are achieved by simultaneously using two sliding mode controllers, one controlling engine speed and other controlling generator torque.