步进电机驱动的实现方法

随着工业自动化的发展，步进电机的应用越来越广泛，步进电机是一种用于开环控制的驱动元件。阐述了步进电机的工作原理和特性，提出了基于单片机控制的步进电机驱动实现方法及软硬件设计方法。     

Design and analysis of multi-source multi-area deregulated power system for automatic generation control using quasi-oppositional harmony search algorithm

The present article focuses on the study of automatic generation control (AGC) of a realistic power system having a distinct combination of multi-area multi-source generating units in each control area under deregulated framework. An attempt is made in this paper to integrate reheat thermal, hydro and gas generating unit in a single control area and, then, extended this combination to five control areas. In this work, six reheat thermal, six hydro and three gas generating units are taken into account for the modeling of five-area power system. Some important physical constraints like time delay, governor dead band and generation rate constraint are imposed in the power system dynamics to get an accurate perception of the deregulated AGC subject. The highlighting features of the present work are to model, simulate, optimize and co-relate their inter-related dynamic performances for the purpose of AGC study. For such a complex AGC model, the vital role of the proposed quasi-oppositional harmony search (QOHS) algorithm, as an optimizing tool, is signified while solving the AGC problem in deregulated regime. The simplicity of the structure and acceptability of the responses of the well-known proportional–integral–derivative controller, inherently, enforces to employ in this work. The three classes of extensive deregulated cases (in the presence of load following and physical constraints) are demonstrated by examining the closed loop performance of the studied model. The simulation results show that the designed power system model may be a feasible one and the proposed QOHS algorithm may be a promising optimization technique under these circumstances.     

Response time for primary frequency control of hydroelectric generating unit

For evaluating the power quality in primary frequency control for hydroelectric generating units, the power response time is an indicator which is of main concern to the power grid. The aim of this paper is to build a suitable model for conducting reliable simulation and to investigate the general rules for controlling the power response time. Two huge hydropower plants with surge tank from China and Sweden are applied in the simulation of a step test of primary frequency control, and the result is validated with data from full scale measurements. From the analytical aspect, this paper deduces a time domain solution for guide vane opening response and a response time formula, of which the main variables are governor parameters. Then the factors which cause the time difference, between the power response time and the analytical response time of opening, are investigated from aspects of both regulation and water way system. It is demonstrated that the formula can help to predict the power response and supply a flexible guidance of parameter tuning, especially for a hydropower plant without surge tank.     

下福电厂调速器故障分析与处理

本文分析了灯泡贯流式机组调速器远端甩负荷、孤网运行不稳定、机组孤网带厂用电运行、自动化元件故障等问题,提出了处理意见,采取了相应的防范措施,使问题得到了解决。     

水轮机调节系统控制策略发展与应用

概述了水轮机调节系统的特点及其调速器的发展,着重介绍了PID控制、自适应控制和智能控制的特点及其在水轮机调节系统中的应用.提出将多种控制策略相结合形成复合控制,将是水轮机调节系统控制策略的发展方向.     

无机房电梯的一种平层标识救援方法

某建筑物安装有一台无机房电梯,因受现场条件限制．原有的曳引钢丝绳平层标识达不到应急救援的要求,故综合现场实际情况。提出了一种在限速器钢丝绳上设置平层标识的新方法．通过采用该方法．使得整改后满足了应急救援要求。     

利用Matlab/Fuzzy Logic进行柴油机电子调速器PID参数模糊自整定设计与仿真

电站柴油机电子调速器PID参数模糊自整定是目前研究的一个方向，模糊控制系统的设计是模糊控制应用中的主要工作，而系统的仿真是设计中的重要步骤和必要的保证。本文介绍了如何利用Matlab中Fuzzy Logic工具箱及Simulink仿真平台进行电站柴油机电子调速器PID参数模糊自整定的设计与仿真。这种方法使模糊控制的设计、仿真及优化变得容易、直观且迅速。     

联网燃气轮机的动态特性分析

介绍了燃气轮机发电机组及其励磁系统和调速系统的数学模型,并在MATLAB中建立了燃气轮机励磁系统的仿真模型,对其动态特性进行了仿真计算.利用电力系统分析综合程序(PSASP 6.1版)建立了燃气轮机励磁系统及调速系统的用户自定义模型,并结合典型配电网,对并网后的燃气轮机进行了暂态分析和小干扰稳定分析计算,分析了励磁系统及调速系统的有关参数对燃气轮机动态特性的影响,为研究分布式电源对电力系统暂态特性的影响奠定了基础.     

基于台达PLC的水轮机调速器设计与开发

本文介绍了一种水轮机调速器产品的设计和开发,设计中采用了台达EH系列高性能PLC,配置了专用的测频卡,弥补了大多数中小型PLC不能直接进行脉冲频率测量的不足。重点描述了产品的整体设计、测频回路的原理及测试、供电模块及频率处理模块的开发,并给出了机组的控制流程。该设计案例可为我国诸多中小型水电调速设备的新建和改造提供有益的借鉴。     

一种调速过程的模糊自适应控制

动力系统中柴油机类调速控制的寻优过程一直探索了许多年，令人满意的控制方案仍难见到，尤其是对于负荷随机变化而导致的速度变化，始终未有很好的解决方案，本文给出了在柴油机电子调速顺微机控制中，采用模拟自适应控制的、优越的控制算法，成功地解决了这一类速度控制的问题，从仿真结果和实验曲线中可以看出，所给的设计方法是有效的。