基于系统辨识的超临界600MW机组给水控制热工对象建模与仿真  

The Modeling and Simulation on Feed-Water Control Thermal Object of Supercritical 600MW Unit Based on System Identification

作　　者：米克嵩 王波[2] 杨建蒙[2] 

机构地区：[1]内蒙古国华呼伦贝尔发电有限公司,内蒙古呼伦贝尔021025 [2]华北电力大学,河北保定071003

出　　处：《应用能源技术》2011年第9期26-29,共4页Applied Energy Technology

摘　　要：超临界机组给水控制的任务是以中间点温度或焓值作为表征量,进而控制汽温和不同负荷下的给水量。中间点焓值概念明确、灵敏度高,并且由于工质大比热特性,故应用中间点焓作为表征量更科学。对于直流锅炉给水的吸热、蒸发和过热之间没有明确分界的复杂对象,机理建模已难于适用。而以输入输出数据提供的信息来建立热工对象模型的系统辨识方法则显出优越性。依据某超临界600MW机组DCS数据图,应用MATLAB系统辨识建立了中间点焓值—给水量热工对象数学模型并降阶简化。最后以一仿真实例验证了模型的有效性、准确性及工程应用价值。The feed-water control apphcation of supercritical unit is keeping the steam temperature and water supply under different load as a characterization of intermediate point temperature or enthalpy value. The concept of intermediate point enthalpy is clear, the sensitivity is accurate, and due to the characteristic of large specific heat of refrigerant, it is reasonable that taking intermediate point enthalpy as a characterization. It is a complicated phenomenon that there is no clear divide among the heat transfer, steaming and overheat about once-through boiler, the mechanism modeling is not easy. But the system identification which is modeling by the information providing by input and output data is superior. According to the DCS data, building and simplifying a mathematical model by using the MATLAB system identification. Finally verifying the model is effective, accurate and applied in engineering.

关 键 词：超临界机组 给水控制 系统辨识 建模 仿真 

分 类 号：TK223.5[动力工程及工程热物理—动力机械及工程]