共查询到20条相似文献,搜索用时 31 毫秒
1.
Mohammad Saleh Tavazoei 《Physics letters. A》2008,372(6):798-807
In this Letter, we propose a fractional-order controller to stabilize the unstable fixed points of an unstable open-loop system. Also, we show that this controller has strong ability to eliminate chaotic oscillations or reduce them to regular oscillations in the chaotic systems. This controller has simple structure and is designed very easily. To determine the control parameters, one needs only a little knowledge about the plant and therefore, the proposed controller is a suitable choice in the control of uncertain chaotic systems. 相似文献
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设计了一种的自适应控制算法并证明了其正确性. 通过总体最小二乘旋转不变技术辨识出系统降阶模型及相关振荡模态,利用带通滤波器将不同的振荡模态分解到多个通道,然后基于所提的自适应算法对每个振荡模态设计了自适应控制器,减小了各个控制器间的影响. 在电磁暂态程序PSCAD/EMTDC中对向上直流孤岛运行方式进行了仿真验证. 结果表明:所提控制方法相对传统比例积分微分控制有更好的控制效果;对于系统发生不同故障时具有鲁棒性. 对于系统信号传输引起的时滞导致的控制器效果变差的问题,可以通过相位补偿解决.
关键词:
超稳定理论
系统辨识
振荡
自适应阻尼控制 相似文献
3.
Issarachai Ngamroo A.N. Cuk Supriyadi Sanchai Dechanupaprittha Yasunori Mitani 《Physica C: Superconductivity and its Applications》2009,469(1):44-51
The large penetration of wind farm into interconnected power systems may cause the severe problem of tie-line power oscillations. To suppress power oscillations, the superconducting magnetic energy storage (SMES) which is able to control active and reactive powers simultaneously, can be applied. On the other hand, several generating and loading conditions, variation of system parameters, etc., cause uncertainties in the system. The SMES controller designed without considering system uncertainties may fail to suppress power oscillations. To enhance the robustness of SMES controller against system uncertainties, this paper proposes a robust control design of SMES by taking system uncertainties into account. The inverse additive perturbation is applied to represent the unstructured system uncertainties and included in power system modeling. The configuration of active and reactive power controllers is the first-order lead–lag compensator with single input feedback. To tune the controller parameters, the optimization problem is formulated based on the enhancement of robust stability margin. The particle swarm optimization is used to solve the problem and achieve the controller parameters. Simulation studies in the six-area interconnected power system with wind farms confirm the robustness of the proposed SMES under various operating conditions. 相似文献
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静止无功补偿器(static var compensator,SVC)不仅可以为电力系统提供无功支撑、稳定电压,其附加控制还可以有效提高系统暂态稳定性,但SVC模型参数的不确定性以及广域测量信号时延等外部干扰给附加控制器的设计带来很大的难度.提出了一种基于自适应滑模变结构理论的SVC鲁棒控制器设计方法,所设计控制器能有效提高系统暂态稳定性,并且其对于模型不确定性以及时延有较好的鲁棒性.首先根据区域惯量中心的运动方程建立了包含SVC的电力系统模型;然后将滑模变结构理论应用于电力系统模型中,求得SVC附加控制律,并通过自适应律优化控制器参数;最后通过四机两区域系统以及IEEE9节点系统对SVC控制器效果进行了仿真验证.结果表明,SVC自适应滑模控制器可以有效提升系统暂态稳定性,并且其性能优于传统的线性控制方法. 相似文献
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针对电力系统控制器设计中,控制器阶数过高且影响控制品质的问题,提出一种基于射影定理的降阶控制器设计新方法,并对射影定理做出改进,实现抑制低频振荡的高压直流附加阻尼控制.通过总体最小二乘-旋转不变技术分析系统振荡特性并辨识出相关模型,再基于极点配置得到状态反馈矩阵,最后利用改进的射影控制理论设计输出反馈降阶控制器,同时将控制器与传统的带观测器的极点配置控制方法进行比较.仿真验证表明,基于射影控制理论的控制器效果较好,控制器阶数较低,鲁棒性强,便于工程实现. 相似文献
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为提高HL-2A 装置辅助加热系统脉冲阶梯调制(PSM)电源的运行效率和操作可靠性,设计并实现了一种基于CAN 总线技术的远程控制通信系统。该系统采用载有SJA1000CAN 总线控制器的PCI 板卡以及TMS320F2812 微处理器分别作为上位机和下位机的通信终端,结合用户界面程序,实现了HL-2A 受控核聚变装
置辅助加热电源的远程控制,提高了其整体控制性能和操作效率。 相似文献
8.
为提高HL-2A 装置辅助加热系统脉冲阶梯调制(PSM)电源的运行效率和操作可靠性,设计并实现了一种基于CAN 总线技术的远程控制通信系统。该系统采用载有SJA1000CAN 总线控制器的PCI 板卡以及TMS320F2812 微处理器分别作为上位机和下位机的通信终端,结合用户界面程序,实现了HL-2A 受控核聚变装
置辅助加热电源的远程控制,提高了其整体控制性能和操作效率。 相似文献
置辅助加热电源的远程控制,提高了其整体控制性能和操作效率。 相似文献
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A control system which can improve stabilization of laser power in long-term operation automatically is designed for a deuterium cyanide (DCN) far-infrared laser interferometer on the Experimental Advanced Superconducting Tokamak. It stabilizes the output power of the laser by a closed-loop control system aided by a programmable logic controller. The system has been applied to the DCN laser and it has been proven that it is effective in stabilizing the laser near the highest scope of the output power. 相似文献
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纯电动汽车迅速发展,要求其空调系统也急需跟进。根据纯电动汽车特点,开发出一种纯电动汽车空调控制器系统,设计了空调控制器的电源模块,阐述了使用无位置传感器控制压缩机无刷直流电机的原理,研发了一种过流检测电路。提出了一种新型控制方法,即:在考虑整车负载的基础上,使用多输入变量模糊控制算法对汽车空调压缩机电机进行控制,同时兼顾了乘员的舒适性与汽车的动力性。结果表明这种空调控制器运行良好,达到了预期效果。 相似文献
12.
The performance of synchronous reluctance motor (SynRM) degrades due
to chaos when its systemic parameters fall into a certain area. To
control the undesirable chaos in SynRM, a passive control law is
presented in this paper, which transforms the chaotic SynRM into an
equivalent passive system. It is proved that the equivalent system
can be asymptotically stabilized at the set equilibrium point,
namely, chaos in SynRM can be controlled. Moreover, in order to
eliminate the influence of undeterministic parameters, an adaptive
law is introduced into the designed controller. Computer simulation
results show that the proposed controller is very effective and
robust against the uncertainties in systemic parameters. The present
study may help to maintain the secure operation of industrial servo
drive system. 相似文献
13.
Zaher AA 《Chaos (Woodbury, N.Y.)》2008,18(1):013111
The dynamic behavior of a permanent magnet synchronous machine (PMSM) is analyzed. Nominal and special operating conditions are explored to show that the PMSM can experience chaos. A nonlinear controller is introduced to control these unwanted chaotic oscillations and to bring the PMSM to a stable steady state. The designed controller uses a pole-placement approach to force the closed-loop system to follow the performance of a simple first-order linear system with zero steady-state error to a desired set point. The similarity between the mathematical model of the PMSM and the famous chaotic Lorenz system is utilized to design a synchronization-based state observer using only the angular speed for feedback. Simulation results verify the effectiveness of the proposed controller in eliminating the chaotic oscillations while using a single feedback signal. The superiority of the proposed controller is further demonstrated by comparing it with a conventional PID controller. Finally, a laboratory-based experiment was conducted using the MCK2812 C Pro-MS(BL) motion control kit to confirm the theoretical results and to verify both the causality and versatility of the proposed controller. 相似文献
14.
The performance of synchronous reluctance motor (SynRM) degrades due to chaos when its systemic parameters fall into a certain area. To control the undesirable chaos in SynRM, a passive control law is presented in this paper, which transforms the chaotic SynRM into an equivalent passive system. It is proved that the equivalent system can be asymptotically stabilized at the set equilibrium point, namely, chaos in SynRM can be controlled. Moreover, in order to eliminate the influence of undeterministic parameters, an adaptive law is introduced into the designed controller. Computer simulation results show that the proposed controller is very effective and robust against the uncertainties in systemic parameters. The present study may help to maintain the secure operation of industrial servo drive system. 相似文献
15.
放射性污染物粘膜铺设车是核事故应急的一种主要装备。为解决放射性污染物粘膜铺设车多工位实时操控需要,设计了由主控屏、辅控屏和手持终端三种控制终端共同组成上位机的控制系统。该系统以主控屏作为交互中心,通过标准RS232接口与下位机通信;辅控屏和手持终端作为主控屏外设,分别通过CET-5E网线和蓝牙将数据实时传输至主控屏,实现不同工位下的可靠操控。下位机主控制器以ARM7作为主处理器,采用Modbus通信协议与上位机通信,便于系统后续拓展开发。实验表明,该多终端操控系统不受辐射环境干扰,通信稳定,操作便捷,实时性高,符合粘膜铺设车作业工况要求。这种通过主屏地址映射实现多终端控制的方式,有利于降低主控制器仲裁压力、减少数据冗余、提高系统时效,适合在各种特种车辆的控制系统中推广应用。 相似文献
16.
This paper investigates the effect of a small time-delay on dynamic output feedback control of an offshore steel jacket structure subject to a nonlinear wave-induced force. First, a conventional dynamic output feedback controller is designed to reduce the internal oscillations of the offshore structure. It is found that the designed controller is of a larger gain in the sense of Euclidean norm, which demands a larger control force. Second, a small time-delay is introduced intentionally to design a new dynamic output feedback controller such that (i) the controller is of a small gain in the sense of Euclidean norm and (ii) the internal oscillations of the offshore structure can be dramatically reduced. It is shown through simulation results that purposefully introducing time-delays can be used to improve control performance. 相似文献
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口腔术综合治疗仪是口腔治疗必备的大型仪器设备,对各功能部件的控制及模块间协调要求严格;基于STC系列的51单片机设计了一种新型的控制系统,利用PWM控制方法解决了手术照明的无级调光问题;对反馈信号进行处理,实现了座椅的精确控制与位置记忆;设计了合理的电源与接口,可以外挂驱动多种相关手术仪器;高精度的电源监控电路,保证了系统的安全运行,实现了二次上电的状态恢复;通过上位机与网络,实现了对仪器的远程控制与维护。系统低功耗,低电磁辐射,抗干扰能力强。该系成功统应用于佛山某外资公司并实现产业化,效果良好,已远销各地。 相似文献
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基于QNX实时操作系统的IDE编译平台,设计开发了J-TEXT装置纵场电源的实时控制系统。该系统具有良好的实时性、可靠性和稳定性,成功控制纵场电源产生了92.5kA、平顶时间为1s的准梯形脉冲电流,在等离子体中心产生1.74T的磁场,满足了J-TEXT装置目前放电实验的需要。 相似文献