大机组汽包锅炉给水控制系统毕业论文

大机组汽包锅炉给水控制系统的设计与讨论摘要给水全程控制系统是火力发电厂单元机组协调控制中的主要子系统之一，针对其可靠运行直接关系到整个发电系统的安全问题，采纳单冲量和三冲量控制系统有机结合的控制策略，应用自动控制理论对单元机组给水的要求和特点进行了全面的分析，使单元机组给水全程控制从锅炉点火到机组满负荷运行，始终保持汽包水位在允许的围，而且系统稳态误差小，控制精度高，超调量小。此外还提出了在系统设计时应注意的几个关键问题，这对单元机组给水全程控制系统的设计和调试均具有一定的参考价值。关键词：三冲量；串级；切换；跟踪DESING AND RESEARCH OF DRUM LEVEL FULL CONTROLAbstractThe full-range feed-water control system is a main subsystem of thermo-electric generating unit in coordinated control. Its reliability is most closely related to the safety of whole power network. The feed-water features and requirements of thermo-electric generating unit were analyzed comprehensively based on basic automatic control theories. and the control strategy was realized by combining three-impulse with single-impulse feed-water control system. From startup to full load operation, The full-range feed-water control system always keeps the steam level withinanacceptablerange. Thesystemhasthecharacteristicsofhigherwaterlevel controlaccuracy, smallerovershootandlowererrorinsteadystate. Inaddition, severalkeydesigntechniquesarepresented, whichcanbeappliedtothedesignanddebuggingofThe full-range feed-water control systemKeywords: three element control；cascade configuration；switch ；track目 录摘要 IABSTRACT........................................................................................................II目录 I1 绪论 11.1 课题的讨论背景与意义 11.2 国外全程给水讨论现状 11.3 课题主要讨论工作 22 给水被控对象的动态特性 32.1 全程控制的概念 32.2 给水控制对象的动态特性 32.2.1 给水流量扰动下水位的动态特性 32.2.2 蒸汽流量扰动下水位的动态特性 52.2.3 炉膛热负荷扰动下水位的动态特性 ...