摘要
火电单元机组为一复杂多变量对象,给水流量与机组负荷-机前压力系统之间存在明显的耦合。利用能量及质量守恒定律,从锅炉侧和汽轮机侧分别分析给水流量影响机组负荷和机前压力的机理,建立给水流量-锅炉燃料量-汽轮机调门开度与机组负荷-机前压力之间的三入二出动态模型。模型以微分方程形式给出,主要参数均具有明确的物理意义,便于工程实用。并针对一实际机组,根据其设计数据确定模型参数。通过构建控制系统仿真发现,机跟炉和炉跟机控制方式均不能有效消除给水流量波动对机组负荷及机前压力造成的影响。
Thermal power unit is a complicated object with multi- variables; there is obvious coupling in feed water flow and unit load - pressure system. By virtue of the law of energy conservation and mass conservation, the mechanism of influence feed water flow exerts on the unit load and the main steam pressure is analyzed from boiler side and from turbine side respectively. Furthermore the dynamic model of three inputs and two outputs is constructed. The three inputs are feed water flow, boiler fuel flow and turbine regulating valve opening; the two outputs are unit load and the main steam pressure. The model is described with differential equations. The main parameters of the model have clear physical meanings, so it is easily used in practical engineering. According to the design data of a real unit, the model parameters are confirmed. By the construction of control system and the simulation analysis, it is found that, neither the turbine following mode or the boiler following mode can eliminate the influence feed water flow exerts on units load and on the main steam pressure.
出处
《华北电力大学学报（自然科学版）》
CAS
北大核心
2009年第5期56-60,共5页
Journal of North China Electric Power University：Natural Science Edition
基金
国家自然科学基金资助项目(50776030)
关键词
自动控制技术
汽包锅炉
给水
负荷-压力
耦合
仿真分析
automatic control technique
drum-boiler
feed water
load-pressure
coupling
simulation analysis
