BOOST变换器延迟反馈混沌控制及其优化

引入输出延迟反馈控制(time-delay feedback control, TDFC)到峰值电流控制BOOST变换器中，构建了被控系统的离散迭代模型，获取相应的Jacobian矩阵表达式.通过分析变换器在平衡点的变化规律及Jacobian矩阵特征值轨迹，确定出控制系统混沌到单周期态的TDFC反馈增益范围，并依据状态变量和占空比的收敛情况讨论了系统的稳态和动态性能，实现了对TDFC控制参数优化选择.仿真结果证实了所提控制方式的有效和理论分析的正确.     

电压型buck-boost变换器的混沌控制

由于科学技术发展水平的限制,还无法利用处于混沌态的DC-DC变换器来达成一些期望的目标,所以对于DC-DC变换器中的混沌现象几乎都是抑制它的出现.本文针对工作在断续模式的电压型buck-boost变换器的混沌分岔现象,分别采用两种方法控制系统稳定工作在单周期态.第一种是无源延时反馈控制,它具有动态响应速度快、不改变系统频率的优点,但它在扰动过大时失效.第二种是改进的滑模控制,它具有动态响应特性好、鲁棒性好的优点.仿真结果表明,两种控制方法都能使buck-boost变换器稳定工作在单周期态,达到抑制其进入混沌态的目的.     

峰值电流模式控制同步开关Z源变换器的动力学研究

Z源变换器由于Z源网络的嵌入,具有高电压传输比,降低开关器件损耗,提高系统效率等优点,在直流变换、逆变等许多领域具有广泛的应用.本文研究了基于峰值电流模式控制的同步开关Z源变换器的非线性动力学,建立了连续电流模式下同步开关Z源变换器的离散迭代映射模型;通过特征值的运动轨迹分析了参考电流对系统稳定性的影响,给出了系统稳定运行的参数域;基于分岔图和Lyapunov指数图发现了此变换器存在倍周期分岔、边界碰撞分岔、切分岔和阵发混沌,分析了边界碰撞分岔和混沌演化过程及其产生的机理;最后通过电路仿真和实验验证了理论分析的正确性.研究结果表明:随着参考电流的增加,峰值电流模式控制同步开关Z源变换器从周期1经历倍周期分岔进入周期2和周期4,然后由于边界碰撞分岔过渡到阵发混沌态,接着通过切分岔进入周期3,最后再次由于边界碰撞分岔进入混沌态.     

间歇反馈法实现单模Lorenz-Haken激光系统的周期镇定与同步

针对单模Lorenz-Haken激光系统中存在的混沌现象, 提出一种单变量间歇反馈控制方案. 数值结果表明, 通过选择不同的控制强度, 可将Lorenz-Haken激光混沌系统镇定到1周期态、2周期态、4周期态、6周期态、8周期态等. 同时, 利用该控制方案, 实现了Lorenz-Haken激光混沌系统的同步.     

基于状态关联性的Boost变换器混沌与反混沌控制

混沌控制与反混沌控制是一对逆问题. 通过研究系统状态变量的关联性, 分析了在电流型连续电流模式Boost变换器关联系数变化的情况下, 实现系统的混沌控制与反混沌控制的方法, 为实际应用打下理论基础. 建立了系统的离散数学模型, 利用单值矩阵理论解释了变换器混沌控制与反混沌控制的机理. 研究结果表明, 在只改变系统状态变量的关联系数的情况下, 该控制策略能够将处于任意状态的Boost变换器控制到周期1, 2, 4轨道以及混沌态, 系统的输出可实现混沌与反混沌控制. 仿真结果证明了所提出方法以及研究结果的正确性.     

DC-DC buck变换器时间延迟反馈混沌化控制

混沌化或反混沌控制是混沌控制的逆问题，通过研究DC-DC buck变换器反混沌控制，为其应用打下理论基础.建立了电压时间延迟反馈buck变换器混沌化控制模型，探讨了它的控制机理，分析了buck变换器混沌化条件和稳定特性，由此仿真研究了不同控制参数对变换器混沌化控制的影响.实验结果表明，该方法控制范围宽，易于实现，是一种较好的反混沌控制方法. 关键词： buck变换器 混沌化 时间延迟反馈控制     

半导体激光器混沌光电延时负反馈控制方法研究

提出半导体激光器混沌光电延时反馈控制方法.通过附加一个光电延时电路控制系统,建立了三个有光电延时反馈条件下的注入激光混沌控制物理模型.进行了有控制时的最大Lyapunov指数分析.数字仿真发现,当调节延时时间和反馈光电流时,能控制激光混沌到3周期态、5周期态等;当周期键控光电流时,能控制激光混沌到8周期态、9周期态等;最后,通过组合应用光电延时反馈控制电路系统与附加周期调制驱动电流时,能有效地控制激光混沌到单周期态以及其他周期态. 关键词： 混沌 控制 激光器 光电转换     

延迟自反馈控制Hindmarsh-Rose神经元的混沌运动

利用线性时间延迟自反馈方法,研究单个Hindmarsh-Rose（H-R）神经元模型混沌动力学模式的控制问题.分别将增益因子和时间延迟作为控制参数,通过数值模拟分析,发现在增益因子和时间延迟两个参数组合的一些范围内,混沌动力学模式的H-R神经元运动可自动被控制成时间间隔意义上的单峰、2峰、3峰及4峰的周期或多倍周期模式.延迟时间的选取并无特别要求,不必和嵌入在混沌吸引子内的某不稳周期轨道的周期相同,延迟控制自适应地引导混沌轨到相应的放电峰峰间隔的周期模式上. 关键词： H-R神经元 延迟反馈控制 混沌放电模式 峰峰间隔周期     

Coullet混沌系统的演化和控制实验

构建了Coullet混沌系统的硬件实验电路,改变系统的参数,可以从示波器上观察系统从稳定周期状态演变到混沌状态的分岔过程.采用非线性反馈控制方法实现了对Coullet混沌系统的有效控制,改变反馈控制增益,可以将Coullet系统从混沌状态控制到稳定的周期状态.     

DC-DC buck变换器的分岔行为及混沌控制研究

研究了带负载电容的DC-DC buck变换器的分岔行为及其混沌控制问题，提到了一些新的有意义的结果.随着负载电容的增加，这种电路系统出现周期叠加序列窗口，且系统混沌运动的参数空间的测度逐渐趋于零，而且系统处在周期运动区时其电压转换效率高于系统处在混沌运动区时的电压转换效率，这些结果对于实际电路的设计具有较好的参考价值.同时，采用外加周期脉冲控制方法，能有效地实现该电路系统中的混沌控制.     

电压型双频率控制开关变换器的动力学建模与多周期行为分析

在断续导电模式下, 建立了电压型双频率控制开关变换器的动力学模型, 并推导了相应的特征值方程. 根据动力学模型, 采用分岔图研究了电路参数变化时变换器存在的边界碰撞分岔行为和周期2, 周期3,周期4等多周期行为, 结果表明: 变换器经历了周期1态、多周期态、周期1态的分岔路由; 周期态的转变均是由边界碰撞分岔引起的. 根据特征值方程, 采用Lyapunov指数研究了变换器的稳定性, 结果表明: 随着电路参数的变化, Lyapunov指数始终小于零, 变换器一直工作于稳定的周期态, 验证了电压型双频率控制开关变换器的周期3行为并不意味着变换器会必然发生混沌. 通过电路仿真, 分析了负载变化时变换器的时域波形、相轨图和频谱图, 验证了动力学模型的可行性和理论分析的正确性. 实验结果验证了文中的仿真结果. 关键词： 开关变换器 双频率控制 边界碰撞分岔 多周期行为     

Sampled-data modeling and dynamical effect of output-capacitor time-constant for valley voltage-mode controlled ewline buck-boost converter

By analyzing the output voltage ripple of a buck-boost converter with large equivalent series resistance (ESR) of output capacitor, one valley voltage-mode controller for buck-boost converter is proposed. Considering the fact that the increasing and decreasing slopes of the inductor current are assumed to be constant during each switching cycle, an especial sampled-data model of valley voltage-mode controlled buck-boost converter is established. Based on this model, the dynamical effect of an output-capacitor time-constant on the valley voltage-mode controlled buck-boost converter is revealed and analyzed via the bifurcation diagrams, the movements of eigenvalues, the Lyapunov exponent spectra, the boundary equations, and the operating-state regions. It is found that with gradual reduction of output-capacitor time-constant, the buck-boost converter in continuous conduction mode (CCM) shows the evolutive dynamic behavior from period-1 to period-2, period-4, period-8, chaos, and invalid state. The stability boundary and the invalidated boundary are derived theoretically by stability analysis, where the stable state of valley voltage-mode controlled buck-boost converter can enter into an unstable state, and the converter can shift from the operation region to a forbidden region. These results verified by time-domain waveforms and phase portraits of both simulation and experiment indicate that the sampled-data model is correct and the time constant of the output capacitor is a critical factor for valley voltage-mode controlled buck-boost converter, which has a significant effect on the dynamics as well as control stability.     

Notch filter feedback controlled chaos in buck converter

A method of controlling chaos in the voltage-mode buck converter is presented by using an improved notch filter feedback control in this paper. The proposed control part comprises a notch filter and a low-pass filter. The discrepancy between the outputs of the two filters is introduced into the control prototype of the power converter. In this way, the system period-1 solution is kept unchanged. The harmonic balance method is applied to analysing the variation law of the system bifurcation point, and then the stable range of the feedback gain is ascertained. The results of simulation and experiment are also given finally.[第一段]     

Sampled-data modeling and dynamical effect of output-capacitor time-constant for valley voltage-mode controlled buck-boost converter

By analyzing the output voltage ripple of a buck-boost converter with large equivalent series resistance(ESR) of output capacitor, one valley voltage-mode controller for buck-boost converter is proposed. Considering the fact that the increasing and decreasing slopes of the inductor current are assumed to be constant during each switching cycle, an especial sampleddata model of valley voltage-mode controlled buck-boost converter is established. Based on this model, the dynamical effect of an output-capacitor time-constant on the valley voltage-mode controlled buck-boost converter is revealed and analyzed via the bifurcation diagrams, the movements of eigenvalues, the Lyapunov exponent spectra, the boundary equations,and the operating-state regions. It is found that with gradual reduction of output-capacitor time-constant, the buck-boost converter in continuous conduction mode(CCM) shows the evolutive dynamic behavior from period-1 to period-2, period-4, period-8, chaos, and invalid state. The stability boundary and the invalidated boundary are derived theoretically by stability analysis, where the stable state of valley voltage-mode controlled buck-boost converter can enter into an unstable state, and the converter can shift from the operation region to a forbidden region. These results verified by time-domain waveforms and phase portraits of both simulation and experiment indicate that the sampled-data model is correct and the time constant of the output capacitor is a critical factor for valley voltage-mode controlled buck-boost converter, which has a significant effect on the dynamics as well as control stability.     

晶闸管混沌行为的延迟反馈控制与尖峰电流抑制

应用延迟反馈控制法(time-delayed feedback control,TDFC),有效地控制了晶闸管中出现的混沌行为,由此提出一种基于Floquet定理的延迟反馈控制法的优化设计方法.为进一步抑制延迟反馈控制出现的尖峰电流现象,根据相空间压缩原理对反馈信号进行相空间压缩,从而很好地抑制尖峰电流.     

Noninvasive optical control of complex semiconductor laser dynamics

Time-delayed feedback control (TDFC) is transferred to the optical domain and applied to complex multisection semiconductor lasers as used in optical communication. Pyragas-type control is provided by purely optical feedback from an external Fabry-Pérot interferometer. This all-optical setup needs no time-consuming signal processing and, thus, has practically no speed limit. Proof-of-principle experiments demonstrate noninvasive stabilization of unstable steady states, chaos control, and suppression of noise-induced oscillations on picosecond time scales. A Lang-Kobayashi type model with optical TDFC is investigated taking into account the dynamic details of the device as well as all-optical time-delayed feedback. The parameter regimes that allow for stabilization of stationary emission are mapped out in good agreement with the experiments. Including noise, an analytical expression for the power spectral density is derived, which is confirmed by the experimental all-optical suppression of noise-induced relaxation oscillations.     

Filter based non-invasive control of chaos in Buck converter

A non-invasive method for controlling chaos in the voltage-mode Buck converter is proposed by using a hybrid active filter based feedback controller in this Letter. The harmonic balance method is applied to obtaining the bifurcation-point equations of the controlled system. Hence, a stability-boundary diagram is constructed, through which the control parameters are chosen correctly. The results of simulation and experiment are given after all.     

双环掺铒光纤激光器混沌控制产生周期脉冲及多周期现象研究

研究了双环掺铒光纤激光器混沌控制产生周期脉冲以及多周期现象,并提出了光调制器调制泵浦控制、外部光注入控制、光衰减器控制、光延时时间控制器控制以及相位控制器控制和连续键控反馈光等多种双环掺铒光纤激光器的混沌控制方法.结果表明:用光调制器调制泵浦光能控制激光到周期态及多周期态;用外部光注入能控制激光到单周期态、双周期态、三周期态、四周期态、五周期态以及多种高周期态等,能形成多种形式相空间图样,产生双环掺铒光纤激光器独特的激光单锁模拟和双锁模拟现象;用外部光路反馈控制时,在负反馈条件下,用时间控制器控制反馈光的延时时间能控制激光到不同的周期态和双周期态,用光衰减器控制光的强度能控制激光到稳定态及周期态,用相位调制器控制反馈光的相位进行负反馈和正反馈转换时能有效地控制激光进入到稳定态及周期态;连续键控反馈光相位能控制激光到多周期态等.整个控制系统能动态、有效地控制产生周期光脉冲以及多种新颖的多周期态等.     

Boost变换器中参数斜坡共振控制能力研究

以电流型Boost电路为基础,以电感电流的参考值作为共振参数,详细研究了斜坡共振的调整过程及其控制能力,推导了稳定状态电路的特征参数.分别针对分岔和混沌电路,研究了不同共振电压幅值时参数斜坡共振的控制能力及其稳定参数,从而实现准确的电路参数设计,确保电路稳定可靠地工作. 关键词： Boost变换器 分岔 混沌控制 参数共振