共查询到19条相似文献,搜索用时 281 毫秒
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基于自适应Terminal滑模的混沌振荡控制 总被引:4,自引:0,他引:4
针对电力系统负荷扰动满足一定条件时就会产生混沌振荡现象,提出了一种自适应Terminal滑模混沌控制方法.利用Lyapunov指数证明了系统存在混沌振荡,应用简单电力系统分析了周期性负荷扰动下的动力学行为,设计了Terminal滑模动态使得系统能够快速收敛,给出了扰动的自适应律.应用Matlab/Simulink仿真平台对含噪声和不含噪声的电力系统进行仿真验证.仿真结果表明,该控制方法能够有效地镇定电力系统混沌振荡. 相似文献
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以电流模式控制开关电感Buck-Boost变换器为研究对象,通过数值仿真得到了电路系统的分岔图、庞加莱截面图、最大Lyapunov指数、雅可比矩阵特征值,分析了变换器电路系统非线性行为及混沌产生的原因,推导出了电路系统的稳定判据。首次采用参数微扰法对开关电感Buck-Boost变换器的非线性行为进行了控制,并计算了扰动强度和扰动相位。最后进行了相应的Matlab/Simulink仿真和实验电路验证,实验结果与仿真结果一致。研究结果表明,采用参数微扰法可有效抑制电路系统的混沌。 相似文献
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In this paper, an adaptive control approach is designed for compensating the faults in the actuators of chaotic systems and maintaining the acceptable system stability. We propose a state‐feedback model reference adaptive control scheme for unknown chaotic multi‐input systems. Only the dimensions of the chaotic systems are required to be known. Based on Lyapunov stability theory, new adaptive control laws are synthesized to accommodate actuator failures and system nonlinearities. An illustrative example is studied. The simulation results show the effectiveness of the design method. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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针对一类混沌系统同步控制问题,利用脉冲微分方程的稳定理论,研究了传榆信号具有时间延迟的混沌系统脉冲同步问题,给出了两个混沌系统实现全局渐进同步的判据方法。该方法仅采用具有时间延迟的驱动系统与响应系统输出偏差的线性反馈作为脉冲控制信号,驱动两个混沌系统达到全局渐进同步,且适用于绝大多数混沌系统的同步控制。所设计的控制器结构简单,收敛速度快,易于实现。Roessler混沌系统的仿真实验进一步验证了该方法的有效性和可行性。 相似文献
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根据Rossler系统的动力学方程,数值仿真了系统随自身参数变化的全局分岔图,分析了参数变化引起系统动力学行为的变化。针对系统混沌状态,分别用自适应控制法和控制法两种方法对系统进行控制,仿真结果显示:两种控制法均能将系统控制在稳定的周期轨道。对比了两种控制法对系统控制的结果,在自适应控制中,随着控制参数逐步减小,系统由单周期运动经倍化分岔为双周期运动,再经倍化分岔序列最终通向混沌,动力学行为规则,对应控制参数选择区域连续;在控制中,系统由混沌状态转变为三周期运动,随着控制参数逐步增大,周期运动发生倍化分岔,再经倍化分岔序列通向混沌,系统动力学行为丰富,对应控制参数选择区域范围明确。为Rossler系统的动力学行为研究和混沌控制提供了理论支持,为Rossler系统在工程领域的应用及控制提供了参数选择区域,为其它系统的混沌控制及动力学行为研究提供了经验和方法。 相似文献
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为了抑制七阶电力系统中的混沌振荡,根据自耦PID控制理论提出了一种简单的混沌控制方法。该方法首先将七阶混沌系统控制问题分解为三个严格反馈子系统的控制问题,然后将每个子系统已知和未知动态分别定义为一个总扰动,进而将三个子系统等价映射为一个三阶线性扰动系统和两个二阶线性扰动系统。据此分别构建了在总扰动反相激励下的三个受控误差系统。根据自耦PID控制理论,分别设计了一个扩展自耦PD控制器和两个自耦PD控制器。最后分析了每个子系统的鲁棒稳定性和抗扰动鲁棒性。仿真结果验证了所提控制方法的有效性,每个状态变量均能由混沌振荡状态恢复到稳定运行状态,且控制信号光滑。因此该方法在电力混沌振荡控制系统领域具有良好的实际应用前景。 相似文献
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Maciej J. Ogorzaek Zbigniew Galias Wadysaw Dabrowski Andrzej Dabrowski 《International Journal of Circuit Theory and Applications》1996,24(3):261-268
This paper presents results of a simulation study of complex dynamic phenomena in arrays composed of interacting chaotic circuits. Such arrays can be thought of as a new paradigm for modelling non-linear phenomena in spatially extended (high-dimensional or infinite-dimensional) systems and active media with potential applications in signal processing. Depending on the connection structure between the cells, the array can show disorganized hyperchaotic behaviour or spatially ordered chaotic waves. Patterns of behaviour depending on the excitation of the array and the connection structure are studied in this paper. Chua circuits are taken as standard chaotic cells. 相似文献
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One of the main issues in engineering is the identification of nonlinear systems. Because of the complicated as well as unexpected behaviours of these chaotic systems, it is introduced as special nonlinear systems. A minute change in the primary conditions of such systems would lead to significant variations in their behaviours. On the other hand, due to simple structure of Permanent Magnet Synchronous Motors (PMSM) and its high applications in industry, the use of this machine is dramatically increasing these days. The reflection of a chaotic behaviour as the Permanent Magnet Synchronous Motor is positioned in a particular area. In the model of PMSM, the exact parameters of the system are required to properly control and spot the error. In this paper, Self-Adaptive Learning Bat-inspired Optimization algorithm is used for solving both offline and online parameter estimation problems for this chaotic system. In addition, noise is considered as one of influential factors in control of PMSM. According to simulation results, it can be claimed that the proposed algorithm is a very powerful algorithm for online parameter identification for PMSM. 相似文献
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混沌是非线性系统中出现的确定性的、类随机的过程.混沌系统最基本的特征是对初始条件极端敏感,这些独具特色的性质使得混沌在通信应用领域尤其在伪随机码的产生方面有着很好的应用前景.本文首先分析几类混沌动力学模型-Logistic、Kent、chebyshev、logistic-chebyshev混沌序列,随后以MATLAB的Simulink为仿真平台,把混沌扩频序列应用到DS-CDMA系统中.分析不同混沌扩频序列在多址环境和多径环境下的误码率,验证了混沌扩频技术应用于CDMA通信系统中的可行性和优越性. 相似文献
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This study develops and applies a chaos synchronization-based detection method for an engineering application of monitoring power quality disturbance. The new method can detect minor dynamic changes in signals. Likewise, prominent characteristics of system signal disturbance can be extracted by this technique. The method is then combined with the extension recognition algorithm to accurately apply to signal clustering of power disturbance. According to extensive computer simulation results and a comparison among three typical chaotic systems, it is confirmed that the proposed method is well applicable using various chaotic systems, mostly with very high accuracies. As compared with other traditional methods, the new method is shown to have higher accuracy, faster computing speed and better expandability. It is foreseen that if the method can be implemented by system-on-chip in the near future, it will find many real engineering applications such as hand-held power quality analyzers and auxiliary means for on-line real-time detection, among others. 相似文献