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Mehmet Önder Efe 《Journal of Dynamical and Control Systems》2003,9(2):233-256
A novel approach to the fuzzy variable structure control is presented. The method is applicable to a class of discrete-time multi-input, multi-output systems. The controller for each subsystem is a two-input single-output fuzzy inference system partitioning the input space. The scheme presented analytically demonstrates that an appropriate tuning of the defuzzifier parameters can drive the plant to the desired sliding regime. The analysis begins with the extraction of the equivalent measure of the applied control signal, and continues with the proof of convergence claims for the discrete time sliding mode control. The method discussed has been applied to a double pendulum system, whose dynamics is assumed to be unknown, and the mathematical claims of the paper have been justified through a series of simulations. The results observed strongly recommend the use of the algorithm in the cases where the tracking precision and robustness against disturbances are sought. 相似文献
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In this paper, a new control method for synchronous motor with excitation and damper windings is presented. It is based on one type of nonlinear control; feedback linearization control. To make a realization in the sense of electric drive, symmetricM space vector PWM (pulse width modulation) is applied. Estimation of damper winding currents via Lyapunov function for the whole estimated system is done. The aim of control is to make tracking system for rotor speed and square of stator flux. Simulation of motor starting to predefined operating points is done, and also maintaining these points during step change of load torque is obtained. Simulations give good results. 相似文献
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This paper proposes a design of control and estimation strategy for induction motor based on the variable structure approach. It describes a coupling of sliding mode direct torque control (DTC) with sliding mode flux and speed observer. This algorithm uses direct torque control basics and the sliding mode approach. A robust electromagnetic torque and flux controllers are designed to overcome the conventional SVM-DTC drawbacks and to ensure fast response and full reference tracking with desired dynamic behavior and low ripple level. The sliding mode controller is used to generate reference voltages in stationary frame and give them to the controlled motor after modulation by a space vector modulation (SVM) inverter. The second aim of this paper is to design a sliding mode speed/flux observer which can improve the control performances by using a sensorless algorithm to get an accurate estimation, and consequently, increase the reliability of the system and decrease the cost of using sensors. The effectiveness of the whole composed control algorithm is investigated in different robustness tests with simulation using Matlab/Simulink and verified by real time experimental implementation based on dS pace 1104 board. 相似文献
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针对汽包锅炉过热汽温的特点,设计了自适应模糊控制器,即采用了一种模糊控制的遗传算法将控制器的隶属参数进行优化。理论分析和仿真结果都表明该方案对解决汽包锅炉过热汽温热工过程的非线性和大时滞有显著效果,具有快速的实时性和很强的鲁棒性。 相似文献
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自控在暖通空调系统中的应用和发展 总被引:4,自引:0,他引:4
分析了暖通空调领域中自动控制的特点及分类,指出传统的PID控制和现代的DDC控制在暖通空调系统中的普遍应用,预测了人工智能控制在暖通空调系统中的广阔前景。 相似文献
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将模糊控制理论引入传统的P ID控制器上,设计了可控串联电容补偿器的模糊自适应整定P ID控制器。该控制策略算法简单、无需精确的数学建模,并可在线修改控制器参数,以达到自适应、自学习的目的。通过在单机无穷大系统中对该控制器进行仿真,并与常规P ID控制器的效果相比,该方法可更好地提高系统的暂态稳定性、有效地阻尼系统振荡。 相似文献
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在分析风力发电系统能量转换理论的基础上,将单神经元自适应算法与常规PID算法结合,通过单神经元自学习,对PID控制器的系数进行在线调整,提出一种单神经元自适应PID调节变桨角度的控制方法,建立了风力机桨距角控制数学模型.风速超过额定值后,利用单神经元自适应PID控制器进行变桨控制,将控制结果与采用常规PID控制器的控制性能进行了对比.结果表明:单神经元自适应PID控制器可以将输出功率恒定在额定值,能够对变桨系统进行有效控制,达到预期的目标. 相似文献
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This paper investigates a Luenberger flux observer with speed adaptation for a direct field oriented control of an induction motor. An improved method of speed estimation that operates on the principle of speed adaptive flux and current observer has been proposed. An observer is basically an estimator that uses a plant model and a feedback loop with measured stator voltage and current. Simulation results show that the proposed direct field oriented control with the proposed observer provides good performance dynamic characteristics. The induction motor is fed by an indirect power electronics converter. This indirect converter is controlled by a sliding mode technique that enables minimization of harmonics introduced by the line converter, as well as the control of the power factor and DC-link voltage. The robustness of the overall system is studied using simulation for different operating modes and varied parameters. 相似文献
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Peter Groumpos Vaia Gkountroumani 《能源与动力工程:英文版》2014,(11):1859-1868
Wind energy is currently a fast-growing interdisciplinary field that encompasses many different branches of engineering and science. Modeling and controlling wind energy systems are difficult and challenging problems. The basic structure of wind turbines and some wind control system methods are briefly reviewed. The need for using advanced theories from fuzzy and intelligent systems in studying wind energy systems is identified and justified. FCMs (fuzzy cognitive maps) are used to model wind energy systems. Simulation studies are performed and obtained results are discussed. A new mathematical approach has been proposed to model dynamical complex systems, the DYFUKN (dynamic fuzzy knowledge networks). Many open problems in the areas of modeling and controlling wind energy systems are outlined. 相似文献
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基于模糊滑模控制的电子节气门仿真 总被引:2,自引:0,他引:2
电子节气门是一个非线性系统。本文建立了电子节气门模型,并将滑模控制和模糊控制结合起来,应用于电子节气门系统。在MATLAB平台上建立了仿真模型,仿真实验证明模糊滑模控制算法能够较好地实现对电子节气门的控制。 相似文献