共查询到20条相似文献,搜索用时 109 毫秒
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将分数阶PIλ控制器应用在双闭环直流调速系统的速度调节器上,以提高调速系统的控制性能。PI和PIλ控制器参数的整定通过粒子群优化算法。重点研究了分数阶PIλ控制器作为速度控制器的双闭环直流调速系统的稳定性、快速性。为了分析比较两种控制器的鲁棒性,将系统的前向通道的增益增加了10%~60%,在相同条件下,对基于PI/PIλ的双闭环直流调速系统进行了仿真实验。仿真研究结果表明,采用分数阶PIλ控制器的双闭环直流调速系统的稳定性、快速性和鲁棒性均优于普通PI控制器的系统。 相似文献
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基于模糊神经网络的变换器自适应控制方法 总被引:1,自引:1,他引:0
提出了一种新型的基于模糊神经网络自适应PI调节电流控制电压型PWM变换器方法.结合了模糊神经网络控制与PI控制器,根据三相电流比较产生的三相电流误差和电流误差变化率,自动调整P、I参数,提高了电流的控制精度和变换器的动态性能.采用MATLAB/Simulink对常规PI控制器和模糊神经网络自适应PI控制器进行了仿真对比.仿真结果表明了采用模糊神经网络自适应PI控制器,其系统输出的误差及误差变化要小,系统的跟踪精度得以提高,动态性能得到改善. 相似文献
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天然气发动机仿人智能模糊混合控制器的研究 总被引:10,自引:10,他引:0
本文将智能控制算法和PI控制算法相结合,提出了一种基于PI的模糊混合控制器。新控制器在控制过程中借助仿人智能算法实现控制参数的在线调整。仿真结果表明,该控制方法对非线性时变系统有较好的控制效果。 相似文献
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本文将智能控制算法和PI控制算法相结合,提出了一种基于PI的模糊混合控制器。新控制器在控制过程中借助仿人智能算法实现控制参数的在线调整。仿真结果表明,该控制方法对非线性时变系统有较好的控制效果。 相似文献
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Xian-Ku Zhang Yi-Cheng Jin Lab. of Simulation Control of Navigation Systems Dalian Maritime University Dalian PRC 《国际自动化与计算杂志》2005,2(1):48-51
1 Introduction It is di?cult to directly design the controller for an underwater vehicle using a H∞ standard problem. This is because there is a pole at the origin in the mathe- matical model[1]. A Loop shaping method can be used to design a H∞ robust controller so as to solve this problem, however, the output response to step inputs results in large overshoot when applied practically. It is not very e?ective to solve this problem by iterative tuning of weighting functions, because this re… 相似文献
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This paper proposes the application of Covariance Matrix Adaptation Evolution Strategy (CMA-ES) in fixed structure H∞ loop shaping controller design. Integral Time Absolute Error (ITAE) performance requirement is incorporated as a constraint with an objective of maximization of stability margin in the fixed structure H∞ loop shaping controller design problem. Pneumatic servo system, separating tower process and F18 fighter aircraft system are considered as test systems. The CMA-ES designed fixed structure H∞ loop-shaping controller is compared with the traditional H∞ loop shaping controller, non-smooth optimization and Heuristic Kalman Algorithm (HKA) based fixed structure H∞ loop shaping controllers in terms of stability margin. 20% perturbation in the nominal plant is used to validate the robustness of the CMA-ES designed H∞ loop shaping controller. The effect of Finite Word Length (FWL) is considered to show the implementation difficulties of controller in digital processors. Simulation results demonstrated that CMA-ES based fixed structure H∞ loop shaping controller is suitable for real time implementation with good robust stability and performance. 相似文献
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In this paper, a single-iteration strategy is proposed for the design of a multi-loop PI controller to achieve the desired gain and phase margins for two-input and two-output (TITO) processes. To handle loop interactions, a TITO system is converted into two equivalent single loops with uncertainties drawn from interactions. The maximum uncertainty is estimated for the initial controller design in one loop and single-input and single-output (SISO) controller design is applied. This controller is substituted to other equivalent loop for design, and finally, the first loop controller is refined on knowledge of other loop controller. For SISO controller tuning, a new method is presented to determine the achievable gain and phase margins as well as the relevant controller parameters. Examples are given for illustration and comparison. 相似文献
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A fuzzy logic based supervisory hierarchical control scheme for real time pressure control 总被引:5,自引:4,他引:1
This paper describes a supervisory hierarchical fuzzy controller (SHFC) for regulating pressure in a real-time pilot pressure control system. The input scaling factor tuning of a direct expert controller is made using the error and process input parameters in a closed loop system in order to obtain better controller performance for set-point change and load disturbances. This on-line tuning method reduces operator involvement and enhances the controller performance to a wide operating range. The hierarchical control scheme consists of an intelligent upper level supervisory fuzzy controller and a lower level direct fuzzy controller. The upper level controller provides a mechanism to the main goal of the system and the lower level controller delivers the solutions to a particular situation. The control algorithm for the proposed scheme has been developed and tested using an ARM7 microcontroller-based embedded target board for a nonlinear pressure process having dead time. To demonstrate the effectiveness, the results of the proposed hierarchical controller, fuzzy controller and conventional proportional-integral (PI) controller are analyzed. The results prove that the SHFC performance is better in terms of stability and robustness than the conventional control methods. 相似文献
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分析了由位置控制器、直流传动装置和PLC组成的半浮芯棒连轧机组限动链控制系统的硬件配置及软件组成。此系统在通用的速度、电流双闭环逻辑无环流直流可逆系统的基础上,利用位置控制器作为位置环,给定位置和实际位置的偏差通过位置PI调节器运算生成相应的速度值vk,与设定速度vt,叠加,作为双闭环系统速度环的速度给定,构成位置、速度、电流三闭环。利用中断实现芯棒定位和毛管定位之间的切换。经测试证明,此系统具有定位精度高、动态性能好等特点。 相似文献
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对某真空环境模拟试验舱原有温控系统的半开环的结构进行闭环改造并研制新的控制算法,改善系统的动态性能;在对被控舱内温度进行建模分析的基础上,探讨了PID控制器、基本模糊控制器和模糊-PI复合控制器三种控制器的设计方法以及在温控系统中的实现,并通过常规变温试验和模拟脉冲干扰试验对三种控制器进行比较。 相似文献
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针对永磁同步电机矢量控制系统中,传统PID控制器对永磁同步电机控制性能效率不高以及对工作环境变化的适应性能不良等问题,首先,在两相旋转坐标系下采取双轴理论建立永磁同步电机数学模型;接着,采用模糊控制理论对永磁同步电机矢量控制系统中转速环传统的普通PID控制器进行改进研究,深入地从理论层次研究分析建立得到模糊PI控制器。在Matlab/Simulink环境下建立基于模糊PI控制器的永磁同步电机矢量控制系统仿真模型,并且将建立得到的模糊PI控制器引入永磁同步电机矢量控制系统进行仿真实验。实验结果表明,模糊PI控制器相对于传统的PID控制器具有更加优越的动态性能和稳态性能。 相似文献
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根据在实际项目中架构系统的经验,提出以回路控制器为主体开发新型的温控设备,不仅温度控制效果理想,而且在中小规模的自动化控制系统中,可以很方便地实现集散控制的思想。 相似文献
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提出基于功率控制的三相电压型PWM(pulse width modulation)整流器控制器设计方法。根据能量守恒原理建立的VSR(voltage source rectifier)数学模型可通过忽略回路电阻及电感充放电所消耗的能量等效成线性定常系统。系统外环采用电容储能控制,内环采用电流控制,同时引入直流负载功率补偿,实现对电容储能变化率的直接控制。电流内环采用前馈解耦PI(proportional-integral)控制,将内环等效成一阶惯性环节。电容储能外环采用PI控制,利用代数分析及根轨迹分析,提出外环PI参数的设计方法。VSR系统整体等效为二阶系统。仿真结果表明:本文所提出的控制器设计方法能使得VSR达到优异的性能。 相似文献