基于可编程控制器的主变冷却器控制回路的设计

本文介绍了可编程控制器的主变冷却器控制回路的设计背景、特点、可编程控制器在冷却器起停控制、运行监视功能的实现及对实际运行维护工作中带来的便利.     

非线性励磁控制器的研究

同步发电机励磁控制器是电厂中十分重要的控制设备,结合传统PID控制对非线性励磁控制方式进行有效的改进.DSP控制器与可编程逻辑器件CPLD为核心组成的微机励磁控制器,具有很好的应用前景.     

基于PLC数控车床上下料机器人软件设计

机床上下料机器人能够提高生产效率和机床利用率,研究中选用可编程控制器控制工业机器人和数控车床协调工作,设计其工作流程,并根据工作流程配置了可编程控制器接口和机器人基板硬件,采用梯形图编程方法编写可编程控制器程序,采用示教编程方法编写机器人程序。调试结果表明所设计的数控车床上下料机器人软件运行安全、平稳,机器人动作精准可靠。     

可编程控制器在变频调速供水中的应用

本文简要介绍了变频调速技术及可编程控制技术，结合变压变量供水技术，介绍了可编程控制器控制的变频调速供水系统的配置及其功能特点。     

可编程控制器在管基树脂干燥炉上的应用

管基树脂的干燥是彩色显像管生产过程中不可缺少的工艺步骤,控制较为复杂,要求十分严格,用可编程控制器控制该生产过程,能大大提高生产率和树脂的硬化质量。本文介绍了H-300A型可编程控制器的性能及其应用情况,文章用流程图和动作顺序图表等形式介绍了干燥炉的工作原理和部分结构。     

NY6200燃气发动机电控系统的设计

以燃气发动机为控制对象,设计了一种基于可编程控制器和新型燃气控制器的燃气发动机电控系统。基于NY6200可编程控制器的控制系统扩展性好,能满足燃气发动机多种控制功能的要求;抗干扰能力强,能满足燃气发动机多种使用环境;开发周期短,能快速满足燃气发动机多种市场需求。基于新型燃气控制器的燃控系统对空燃比控制精度高,响应速度快,能使得燃气发动机燃烧效率得到提升。通过实际运用表明,该设计达到了预期目的,保证发动机正常运行。     

国产MB80可编程控制器主机架典型布局对比分析

国产MB80智能可编程控制器(iPLC)主要应用于大、中型常规水电厂的计算机监控系统,可编程控制器(PLC)是计算机监控系统下位机即现地控制单元的核心控制设备.现地控制单元主机架的典型布局有两种,分别是双CPU(中央处理器)在同一主机架的单主机架结构和双CPU分别布置在两个主机架上的双主机架结构.两种典型的主机架布局各...     

PLC在尾气压缩机联锁控制系统中的应用

本文介绍了用可编程控制器实现压缩机联锁的控制,以及压缩机控制系统的第一事故报警的实现等功能.     

基于可编程控制器的水电站机组RTU控制单元

主要介绍基于可编程控制器的水电站机组ＲＴＵ控制单元的基本功能和结构配置以及一些有用的软件设计特点。     

可编程控制器在烟气余热吸附式空调中的应用

介绍了可编程控制器(PLC)在烟气余热驱动的吸附式机车空调中的应用概况，以及吸附式空调的循环过程、控制方案，控制过程和关键控制模块等。     

Optimization of parallel variable-speed-driven centrifugal pumps operation

This paper presents an optimization framework based on dynamic programming mathematic tool suitable to be implemented in programmable logic controllers to improve the automated control of parallel pumping loops aiming at energy conservation. The paper also contributes with simple methods to derive system curve and pumping head-flow speed-dependent characteristic from ordinary field measurements.     

工业以太网在冶金自动化系统中的应用

介绍了西门子Ｓ７－４００系列可编程程序控制器在过程极自动化网络系统中的硬件,软件和组态过程,ＳＩＮＥＣ ＨＩ网的主要性能及作用。     

A programmable dynamometer for testing rotating machinery using athree-phase induction machine

A programmable dynamometer is proposed where the user can define the steady-state and inertial torque-speed characteristic of the load. Rotating machinery can be tested on this dynamometer to determine their transient and steady-state characteristics with a practical load. The user inputs the desired load characteristics by selecting polynomial and inertia coefficients. The system uses proportional-integral (PI) controllers to control a three-phase induction motor using indirect field orientation. Simulations show that the dynamometer offers excellent tracking of the desired torque-speed characteristic and simplicity of use     

Modernization of a Burner Control System in a Thermoelectric Power Plant using Logic Programmable Controllers

The increasing need of maintenance, the lack of spare parts and the extra requirements of a very complex interconnected electrical system demands a new strategy which can support the reliability of a particular power plant. The present maturity of microprocessor technology makes feasible the development of a Burner Management System based on programmable controllers (PLC's). This paper reviews the retrofit of such system utilizing local PLC's developed by the Institute of Electrical Research (IIE). The problem is described in detail including its main constraints. The general characteristics (hardware and software) of the new system are also mentioned.     

Decentralized control strategy for fuel cell/PV/BESS based microgrid using modified fractional order PI controller

The concept of renewable energy based microgrid (MG) and its control has been evolved as key area of research in energy sector. In this paper, a decentralized control strategy based on modified fractional order PI (MFO-PI) and two-degree of freedom PI (2DOF-PI) controllers is proposed for efficient operation of an autonomous MG. The autonomous MG consists of solid oxide fuel cell (SOFC) & photovoltaic (PV) system as distributed generation (DG), battery energy storage system (BESS) as a storage unit and various AC & DC loads. The MFO-PI controller is utilized for controlling voltage source inverters (VSI) and 2DOF-PI is utilized for controlling various DGs and BESS. An evaporation rate-based water cycle algorithm (ERWCA) is employed to optimally tune the proposed controllers. To show the effectiveness of the proposed decentralized control strategy, a comparison of various performance indices such as overshoot, settling time and integral absolute error is made with PI and fractional order PI controllers. The results show that proposed control strategy is efficient in improving the steady state as well as dynamic performance of the system under all operating conditions by effectively regulating the real and reactive power flows among the DGs.     

变风量空调系统中的实时优化节能控制

在对变风量空调系统局部控制的分析基础上,利用其变风量末端风门的开度作为各区域相对负荷的指示信号,提出送风静压的实时优化控制方案;同时,针对新的ＡＳＨＲＡＥ通风标准,还提出了基于室内人数检测和焓控制的新风实时优化控制方案。试验结果证明,同常规的控制方案相比,在保证室内热舒适性和空气质量的前提下,这两个方案分别有较好的节能作用。综合采用两种优化方案,系统不仅能够达到节能的目的,而且在较小负荷情况下能够提高室内空气的品质。     

Modelling of a 5-kW wind energy conversion system with induction generator and comparison with experimental results

A 5-kW wind energy conversion system (WECS) having induction generator is designed and implemented. The induction machine is connected to the power system through PWM inverter and PWM rectifier. Two digital PI controllers are used, one of them is for regulating dc link voltage and the other is for speed control of induction machine. The whole system is governed by a single fixed point digital signal processing unit (DSP). A detailed simulation program is prepared by using Matlab facilities in order to predict the performance of the controllers before implementation.     

Control design for an autonomous wind based hydrogen production system

This paper presents a complete control scheme to efficiently manage the operation of an autonomous wind based hydrogen production system. This system comprises a wind energy generation module based on a multipolar permanent magnet synchronous generator, a lead-acid battery bank as short term energy storage and an alkaline von Hoerner electrolyzer. The control is developed in two hierarchical levels. The higher control level or supervisor control determines the general operation strategy for the whole system according to the wind conditions and the state of charge of the battery bank. On the other hand, the lower control level includes the individual controllers that regulate the respective module operation assuming the set-points determined by the supervisor control. These last controllers are approached using second-order super-twisting sliding mode techniques. The performance of the closed-loop system is assessed through representative computer simulations.     

Power management of PV/battery hybrid power source via passivity-based control

In this paper, the power electronic interface between a DC hybrid power source with a photovoltaic main source and a Li-ion battery storage as the secondary power source is modelled based on the Euler–Lagrange framework. Subsequently, passivity-based controllers are synthesised using the energy shaping and damping injection techniques. Local asymptotic stability is ensured as well. In addition, the power management system is designed to manage power flow between components.Evaluation of the proposed system and simulation of the hybrid system are accomplished using MATLAB/Simulink. The results show that the outputs of the hybrid system have good tracking response, low overshoot, short settling time and zero steady-state error. Afterwards, linear PI controllers are provided to compare the results with those of passivity-based controller responses. This comparison demonstrates the robustness of the proposed controllers for reference DC voltage and load resistance changes.