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1.
开关磁阻电机驱动系统的发展及应用   总被引:1,自引:0,他引:1  
开关磁阻电机驱动(SRD)系统是继变频驱动系统、无换向器电动机驱动系统之后发展起来的一种新型的、性价比很高的节能调速控制系统。本文就SRD系统的组成、结构、工作原理、特点、国内外的发展情况进行了系统的论述,对目前SRD系统存在的问题及研究课题进行了分析。同时,为推广应用SRD系统提出了一些建议和意见,可供有关人员和企业系统了解及推广应用SRD系统做参考。  相似文献   

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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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基于逆系统理论和模糊滑模控制方法对永磁同步电动机调速系统进行了解耦控制研究,提出了一种新型的模糊推理滑模控制策略。根据永磁同步电动机调速系统的动态数学模型,证明了其逆系统的存在性,给出了永磁同步电动机逆系统解耦的模糊滑模控制器设计方法,系统仿真结果表明,该控制策略在不加剧滑动模态抖动的前提下,有效增强了系统的抗负载扰动能力,改善了永磁同步电动机系统的控制性能。  相似文献   

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针对风力发电传统并网方式的缺陷,提出了模糊PI控制器与电压环、电流环和矢量控制相结合的新型控制策略,通过Matlab/simulink平台搭建并网控制仿真模型,发现双馈风力发电机定子电压的频率、幅值、相位比传统并网方式更接近电网电压,实现了无冲击并网的目的,并验证该控制策略的正确性和优越性。  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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模糊自适应方法在垃圾焚烧炉温度控制系统中的应用   总被引:4,自引:0,他引:4  
沈凯  陆继东  昌鹏  李正华  刘刚 《动力工程》2004,24(3):366-369,410
垃圾焚烧炉的运行过程受众多不确定性因素的影响,垃圾焚烧过程的不稳定将导致产生大量新的有害物质,随着人们对垃圾焚烧过程中二次污染问题的日益关注,如何控制垃圾焚烧温度的稳定以减少二次污染的发生已经成为一个重要的研究方向。应用模糊自适应控制策略对垃圾焚烧炉温过程进行控制,并对该控制策略进行了仿真。仿真结果和应用表明:模糊自适应方法具有良好的控制效果,是解决垃圾焚烧过程炉温不稳定的有效途径。图6参6  相似文献   

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通过一种新学习算法的导出,并结合模糊逻辑系统中的模糊基函数,给出了一种带有通用规则库的模糊滑模自适应控制器。这种控制器能够在线自动调整参数,能对热工过程中的大惯性大迟延对象进行有效的控制。当对象参数变化或存在较大扰动的情况下,仍能保持很好的控制品质。该方法已被用于某电厂主汽压力控制系统。仿真结果表明:该算法具有良好的控制品质和很强的鲁棒性。图4表1参7  相似文献   

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以主机检测装置考核实验台的设计为基础,细致地研究了Danaher ServoStar600系列驱动器内部的速度环结构,通过对比参数调整前后系统的变化,说明了PI控制器参数对电机转速精度的影响.确定了系统各项参数后,分析了系统的频域及时域特性.实验曲线表明系统达到了精度指标的要求.在工程中,特别是在对电机转速精度控制方面...  相似文献   

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窦春霞  张兴中 《动力工程》2003,23(5):2684-2686,2664
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  
于梅春  刘泽华 《节能技术》2003,21(2):13-15,19
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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为提高大型火电机组过热蒸汽温度串级控制的性能,提出了一种新型模糊-PID复合控制器的设计方法。该方法可实现在偏离工作点较远的区域模糊控制中起主要控制作用,在工作点附近则主要实施PID控制,实现了两种控制的优势互补,同时还为模糊控制器提供了一种系统化设计方法。实际工业应用结果表明:采用该方法设计的过热蒸汽温度串级控制系统比常规方法设计的系统具有更强的适应能力和良好的控制品质。图9表1参6  相似文献   

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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   

20.
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   

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