滤池恒水位自动控制系统仿真及应用

保持滤池水位恒定是水处理生产过程中的重要控制内容.针对净水厂滤池恒水位控制问题,利用工业组态软件设计上位机人机接口界面HMI,通过机理分析法分别建立被控对象和控制通道的数学模型,应用Windows系统动态数据交换-DDE技术设计系统模型与组态程序之间的数据通讯接口,从而实现滤池恒水位控制系统的实时在线仿真.在PID控制器微分运算时,以被控变量的微分代替偏差的微分,避免因设定值的改变而引起微分项的输出锐变.仿真结果与实际生产过程的控制曲线基本吻合,仿真参数应用于滤池恒水位控制系统后,取得理想的控制效果.与传统数值仿真方法相比,运用本方法进行过程控制系统的在线仿真,能够获得控制系统动态过程的实时控制数据,得到与实际生产过程相似的控制效果,为操作人员对实际生产过程的控制提供有益的参考,并可用作岗位工人或学生实习实训的一种方便和有效的培训工具.     

如何在水厂恒水位过滤系统中用PLC实现PID自动化控制

本文以一工程实例介绍了如何用PLC在水厂的滤池实现PID恒水位控制，它通过PID算法和外围的程序处理，通过控制阀门开度来调节水位，使水位基本恒定在期望值，并且阀门调节次数基本也手动调节一样，但水质却明显好得多，更重要的是在对现场适应能力强，反应快，而且安全脱离人为干预进行全自动控制，对故障也有快速保护，更具安全稳定性。     

基于PLC的PID算法在恒水位控制上的实现

文章针对目前正在实施的郑州市柿园水厂滤池自动化改造项目,采用具有实施控制功能的模块化设计方案,充分挖掘组态软件的功能,利用基于PLC的PID算法实现了水厂滤池恒水位控制.改造后的滤池真正能够达到自动恒水位运行,实现无人值守,大大减轻工人的劳动强度.系统运行正常,具有实用价值.     

基于V型滤池的净水厂自动控制系统设计

结合某净水厂的净水工艺,给出整体自动控制系统构架,并讨论了V型滤池的工艺流程以及其自动控制系统设计,包括相关I/O单元设计和整体PLC控制单元设计以及相关软件设计思路,该系统在实际应用过程中收效良好。     

PLC接收DDE远程传输数据实现恒水位控制

网络和PLC技术的发展,网络通讯与PLC结合,从而实现远程数据传输与控制.水厂供水装置通过DDE远程数据传输,实现了取水泵房自动控制、数据监测、变频器调速和供水装置清水池恒水位控制.提高生产的效率,降低能耗,对确保水厂装置稳定运行起到了重要作用.     

V型滤池多模态智能控制

针对V型滤池恒水位控制系统的快速性和稳定性之间存在矛盾的问题,提出了一种多模态控制方法.     

基于S7-300 FB41的滤池恒水位过滤

文章叙述了如何应用S7-300系列PLC的PID功能块实现滤池恒水位过滤,给出了水厂单个滤池的恒水位过滤程序图、实际参数值及减少清水阀动作频率的方法,对从事净水行业工作的人士有一定的参考作用。     

锅炉汽包水位模糊PID控制

汽包水位是锅炉安全、稳定运行的重要指标,汽包水位的控制大多采用传统PID控制方式,由于其固有的缺点,往往难以获得理想的控制效果.将模糊控制策略引入到PID控制系统中,实现了PID参数的自适应调整,取得了较好的控制品质.     

神经网络PID控制在恒温恒液位系统中的应用

本文讨论了基于神经网络理论的PID控制，并将其应用于恒温恒液位控制系统，利用神经网络的自学习能力在线整定控制器参数。试验结果表明神经网络PID控制器具有较高的工和较强的适就生，可以获得满意的控制效果。     

PLC在水厂滤池自动反冲洗改造中的应用

本文主要讲述西门子S7-200、S7-300系列PLC在珠海市西区水厂滤池恒水位自动反冲洗系统控制改造实例中的应用。本案例,我们在水厂不改变水厂现有构筑物的前期下,结合水厂现有设备的实际运行情况因地制宜地设置了PLC控制程序,实现是对老水厂滤池反冲洗自动化控制改造较为成功的案例。     

智能PID算法在液位控制系统中的应用

针对自己开发的液位控制系统参数难以调整的问题,本文提出了一种智能PID的液位控制方法。智能PID控制算法是在常规PID控制算法的基础上,根据前人和专家的经验以及操作人员的实际经验,针对具有大滞后、时变、非线性系统对象而提出的控制算法。该算法是分段进行调节的,它既有较好的快速性,又有迟滞(死区)控制的稳定性和抗干扰能力。实验结果表明:这种控制方法不仅简单、精度高,而且具有一定的实用价值。     

汽包水位粒子群-PID优化控制

对循环流化床锅炉汽包水位控制系统,采用串级三冲量PID控制,应用粒子群优化算法对PID控制器进行参数整定,并获得了最优参数。仿真结果表明,与传统整定方法相比,这种参数整定方案使汽包水位控制系统具有更好的控制品质,提高了系统的静动态特性。     

基于模糊自适应PID的锅炉汽包水位控制

针对工业锅炉汽包水位的反向特性,设计了一种基于模糊自适应PID控制策略的锅炉汽包水位的三冲量控制系统,该控制系统内环可以快速消除通道的给水扰动,外环能克服蒸汽流量变化产生的扰动。理论分析和仿真结果都表明,此方案对解决锅炉汽包水位的内外扰动具有显著效果,且有快速的适应性和较强的鲁棒性。     

PID control for global finite-time regulation of robotic manipulators

This paper addresses the global finite-time regulation problem of robotic manipulators. A simple nonlinear proportional-integral-derivative (PID) control is proposed by adding a nonlinear proportional and derivative term to the commonly used PID controller. Lyapunov's stability theory and geometric homogeneity technique are employed to prove global finite-time stability. Advantages of the proposed control include the absence of modelling information in the control law formulation and the global finite-time stability featuring fast transient and high-precision positioning. Explicit conditions on the controller parameters to ensure global finite-time regulation stability are obtained. Simulations are presented to demonstrate the effectiveness and the improved performances of the proposed approach.     

PID autotuning for weighted servo/regulation control operation

This paper analyzes optimal controller settings for controllers with One-Degree-of-Freedom (1-DoF) Proportional-Integral-Derivative (PID) structure. A new analysis is conducted from the point of view of the operating mode (either servo or regulation mode) of the control-loop and tuning mode of the controller. Performance of the optimal tuning settings can be degraded when the operating mode is different from that selected for tuning and obviously both situations can be present in any control system. In this context, a Weighted Performance Degradation index, that considers the importance and balance between the servo and regulation operation modes, is minimized and based on this minimization, an autotuning procedure as a function of the normalized process dead-time is proposed.     

Combining fuzzy, PID and regulation control for an autonomous mini-helicopter

This paper reports on the synthesis of different flight controllers for an X-Cell mini-helicopter. They are developed on the basis of the most realistic mathematical model currently available. Two hybrid intelligent control systems, combining computational intelligence methodologies with other control techniques, are investigated. For both systems, Mamdani-type fuzzy controllers determine the set points for altitude/attitude control. These fuzzy controllers are designed using a simple rule base. The first scheme consists of conventional SISO PID controllers for z-position and roll, pitch and yaw angles. In the second scheme, two of the previous PID controllers are used for roll and pitch, and a linear regulator is added to control altitude and yaw angle. These control schemes mimic the action of an expert pilot. The designed controllers are tested via simulations. It is shown that the designed controllers exhibit good performance for hover flight and control positioning at slow speed.     

水箱液位系统多模型控制方法

针对水箱液位系统存在的大惯性、大时滞和非线性等特点,采用多模型控制思想设计控制律,以改善控制品质.对于三级水箱液位控制系统,设计多个基于一级水箱的等价控制器,简化控制问题.将水箱液位的设定值跟踪问题转化为多个设定值跟踪问题,并由此构成多模型控制器,避免输入达到上限,从而达到优化控制的目的.采用华晟公司的A3000过程控...     

Internal model control based PID tuning using first-order filter

The selection of filter plays an important role in internal model control (IMC) based controller design. As per the rule, for a minimum-phase delay free plant, IMC based controller is obtained by augmenting a filter. We suggest the use of first-order filter for controller design, which is then parameterized to a conventional PID controller. The proposed scheme brings filter size reduction, closed-loop bandwidth enhancement, and easy formulation of the PID structure. The proposed scheme is applied to some class of linear and nonlinear processes. Further the hardware testing for velocity control of precision modular servo system which contains DC servomotor is carried out through this scheme. Quantitative comparison of servo, regulatory and optimal attributes of the proposed scheme with other popular IMC-PID control techniques depicts sharp reference tracking, good disturbance rejection and minimum integral error performance.