TK200通讯控制系统的探讨

介绍了TK200通讯、控制系统设计上的优点、组成及工作原理。     

高、低压电软起动控制器的应用

分析当前国内几家生产的高低压软启动控制器在煤矿井下应用中的优点,并论述了高低压软启动控制器的工作原理、结构组成、具备的各项保护功能,以及一些特殊性能,针对该控制器的特性,提出合理建议。     

Coordinated voltage control of wind-penetrated power systems via state feedback control

This paper presents an optimal coordinated voltage control scheme for preserving long-term voltage stability of power systems. Linear quadratic integral (LQI) controller is employed to construct this scheme. Also, this paper considers the detailed dynamic model of doubly-fed induction generator (DFIG) wind turbine, synchronous generators, over excitation limiter (OEL) and under-load tap changer (ULTC) system, which are important elements influencing voltage stability of power systems. The proposed approach at each time instance involves following two major steps: First, the power system nonlinear equations are linearized and optimal controllers are obtained by LQI technique. Then, in the second step the system dynamic behavior is investigated via time-domain simulations by applying the attained optimal control signals at the first step. The impact of the proposed coordinated voltage control scheme is evaluated by time domain simulations on a well-known test system, under variable wind speed and fault conditions.     

Optimal controller synthesis for second order time delay systems with at least one RHP pole

An optimal H₂ minimization framework is proposed in this paper for devising a controller of PID in nature, based on a refined IMC filter configuration. The tuning strategy is for controlling time delay system with at least one pole which falls on the right half of the s-plane. An underdamped model based filter is used in place of the unity damping ratio (critically damped) filter available in the literature to improve the reset action. The method has a single adjustable closed loop tuning parameter. Guidelines have been provided for choosing the pertinent tuning parameter based on the sensitivity function. Simulation work has been executed on diverse unstable models to support the advantages of the proposed scheme. The proposed controller yields improved performances over other recently reported tuning techniques in the literature. Experimental implementation is carried out on an inverted pendulum for demonstrating the practical applicability of the present method. The efficacy of the intended controller design is quantitatively analyzed using the time integral performance index.     

基于模糊PID控制的循环水自动加药与监测系统

工业生产中加强对循环水质的处理变得越来越重要,在对循环水系统存在问题进行分析后,利用西门子S7-200 PLC和WinCC组态软件开发设计了新型工业循环水水质在线监测与自动加药系统,解决了传统控制难以保证加药量准确与均匀的问题;针对加酸中pH值过程具有非线性、时变和大时滞等特点,采用了以控制人员的经验为基础的模糊控制方法,结果表明pH值控制误差完全满足系统要求;系统已在化工厂中投入运行,经实践证明,该系统人机交互性好、可靠性高、抗干扰能力强,满足了现代工业循环水质监管的要求。     

果冻生产过程中自动控制系统的研究

针对果冻生产过程的自动化水平不高,劳动强度大,产品质量不稳定等问题,通过研究果冻生产装备、工艺流程,对果冻生产过程中物料计量、煮料、调配、储存和充填等主要工序进行合理的单元划分,设计出由上位管理计算机、西门子可编程控制器、现场触摸屏、现场测控设备等4部分构成的自动控制系统,对各单元操作中的工艺参数进行现场检测、计量和控制,实现了果冻生产管控一体化。      

射频消融建模仿真的研究进展

为了提高肝肿瘤射频温控消融温度分布的预测精度,建立了具有比例积分（proportional integral,PI）反馈控制器的射频消融温度分布仿真模型,并且研究了有限元模型中不同传热方程（Pennes和Hyperbolic生物传热方程）对温度分布的影响.首先,利用单电极热消融仪对离体猪肝进行温控射频消融实验,电极针尖稳态温度设定为90℃,消融时间为600 s,并利用测温针获得各测温点的热消融数据.然后,建立具有PI控制器的肝肿瘤温控射频消融有限元模型,其中PI控制器通过反馈调节电压源来使针尖温度与实测数据保持一致,传热方程分别采用基于非傅里叶传热规律的Hyperbolic方程和基于傅里叶传热规律的Pennes方程,生物组织电导率和导热率选用温度依赖性函数.最后,通过仿真温度和实测温度进行对比验证.结果表明,相比于Hyperbolic方程,采用Pennes方程的仿真模型具有较高的精度,各测温点的仿真温度与实验结果之间的标准偏差、平均误差和最大误差的均值分别为0.78、1.46、2.90℃.因此,基于PI控制器和Pennes生物传热方程的肝肿瘤温控射频消融有限元模型能够有效地预测热消融温度.

     

一种基于电磁驱动技术的环形控制器

介绍了一种利用电磁驱动技术实现环形运动的姿态调整控制器的基本结构,给出了具体实现驱动的方法和一般控制驱动电路,初步讨论了影响其运行效率的主要因素及改进的方法。该环行控制器可应用于有特殊要求的姿态控制场合。     

Radial Clearance Control and Internal Leakage Analysis of a Tri-Proportion Controller

The tri-propellant thermal propulsion system is one of the hottest subjects in the field of underwater vehicles recently.To improve efficiency of underwater vehicles,a method of radial clearance control of the tri-proportion has been proposed.Based on analyzing the factors which influence the pressure decrease and leakage of the tri-proportion controller,a method is used for precision analysis and proportion adjustment by using the median optimizing theory.Analysis results show that accuracy of the proporti...     

皮带机传动装置电控监控系统

本文介绍了系统的工作原理、选用的主要元器件、结构设计和主要工艺措施.