火电厂主汽温的西门子控制策略应用研究  

Siemens control strategy of main steam temperature in power plant

作　　者：王文兰[1] 孔昭东[2] 刘剑恒 

机构地区：[1]内蒙古工业大学电力学院,内蒙古呼和浩特010080 [2]内蒙古电力科学研究院,内蒙古呼和浩特010020 [3]内蒙古惠丰集团,内蒙古呼和浩特010010

出　　处：《电力自动化设备》2011年第3期139-141,共3页Electric Power Automation Equipment

摘　　要：汽温控制一直是火电厂模拟量控制系统的难点,主要是因为汽温控制对象具有大延迟、大惯性、非线性和时变性等特点,采用常规和简单的控制规律难以获得较好的调节效果。针对以上特点,提出采用西门子公司主汽温度控制策略控制主汽温。该策略是一个具有导前温度信号的双回路汽温调节系统,内回路采用导前温度为反馈信号,通过计算进入过热器的蒸汽具有的焓值,来确定喷水减温阀出口温度的设定值。动态时系统输出与主汽温相等,从而改善了主汽温调节对象的动态特性。通过电厂实际数据的测试,证明了该控制策略具有抗干扰能力强、对惯性和延迟适应能力强的优点,系统具有良好的控制品质。As the object of temperature control in thermal power plant has big delay,large inertia,nonlinearity and time-variability,the regulating effect of conventional and simple control law is poor.Siemens control strategy is thus adopted in the control of main steam temperature,which is a dual-loop regulation system.The inner loop applies the temperature before differentiation as the feedback signal and the calculated enthalpy of the steam entering into the superheater is used as the outlet temperature setting of spay-type attemperator valve.The dynamic system output is same as the main steam temperature to improve the dynamic characteristics of the controlled object.Test with actual plant data demonstrates that,the introduced control strategy has better adaptability to inertia and delay,with great anti-interference capability and excellent system control quality.

关 键 词：主汽温 西门子控制策略 PTn模块 焓值 

分 类 号：TM714[电气工程—电力系统及自动化]