摘要
火电厂的主汽温度存在大惯性、大延迟等缺陷,而常规串级控制难以取得良好的控制效果。针对以上问题,提出采用西门子公司的主汽温度控制策略控制主汽温。它是一个具有导前温度信号的双回路汽温调节系统,其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。仿真结果表明,此控制策略具有抗干扰能力强、对惯性和延迟适应性好等优点。
As an important controlled object in fossil-fired power plant,the main steam temperature features large inertia and time lag.It is difficult to reach good control effect by using conventional cascade control.In accordance with this issue,the control strategy offered by Siemens is proposed.This strategy is based on a dual-loop steam temperature regulating system with lead-temperature signal.The inner loop uses the lead-temperature as the feedback signal,through calculating the enthalpy of the steam entering superheater to determine the set-point of output temperature of spray desuperheating valve.The result of simulation indicates that this controller features higher anti-interference capability and good adaptability to the inertia and time lag.
出处
《自动化仪表》
CAS
北大核心
2010年第11期15-16,20,共3页
Process Automation Instrumentation
关键词
主汽温
控制策略
串级控制
焓值
仿真
Main steam temperature Control strategy Cascade control Enthalpy Simulation
