描述
300MW及以上容量机组的热工控制已全面采用DCS控制系统，逐步形成了数据采集(DAS)、模拟量控制(MCS)、顺序控制(SCS)、燃烧器管理(BMS)四大系统。从实际运行情况来看，DCS较好地实现了其控制功能，并发挥了安全经济、使用可靠的优点，取得了良好的效果，而电气控制仍然采用较常规的控制手段，使用盘台上一对一硬手操方式。随着计算机的快速发展和控制技术的不断提高，使得机炉控制与电气控制日益显得不协调，控制水平也逐渐拉大。为了解决这一矛盾，有效的办法就是将电气纳入DCS控制之中，这样既利用DCS已成熟的分散控制技术，又能提高电气控制水平。电气控制纳入DCS以后，可充分利用DCS的手段，使电气防误操作等功能实现更方便、更完备，并且将相关量的显示报警与电气设备的控制调节有机地结合起来，有效提高整个电气控制的安全性和可靠性。
1997年7月原电力部召开了热工自动化领导小组第六次扩大会，对电气设计如何与DCS配合提出了具体意见：“实现炉、机、电集中管理，使电厂主控室炉、机、电控制水平协调发展是必要的而且在现有技术和装备条件下是可行的，可以起到省人、省主控制室面积，便于集控值班运行的作用，而且不提高造价。领导小组要求以积极的态度加入电气纳入DCS的工程试点。”按此精神，九江电厂三期2×350MW、信阳电厂一期2×300MW、益阳电厂一期2×300MW工程电气系统均纳入DCS监控。现依据这几个工程中具体实施的过程和要求，就电气系统纳入DCS监控的一些有关问题进行分析和探讨。
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