汽轮机的长期动态模型与仿真

Long-term dynamic model and simulation of steam turbines

为了全面、可靠、快捷地研究调峰及负荷变化过程中各种锅炉汽轮机发电机组的长期动态特性,通过合理的机理分析和简化建立起汽轮机本体及其汽水系统回热加热器的简化数学模型,并以此为工具对某600MW超临界机组的长期动态特性进行了仿真研究。结果表明:本模型能较为合理地反映锅炉给水流量和新蒸汽压力变化对汽轮机抽汽的压力、流量以及机组功率变化的作用和影响,为各种锅炉汽轮机发电机组的长期动态特性研究提供了一个十分简便、新颖的数学模型。

Old steam turbine dynamic models typically ignore changes in the extraction steam flow rate. This paper presents a simplified steam turbine dynamic model based on physical principles that reflect the longterm dynamics for 10 minutes or longer. The model considers the effect of changes in the main boiler steam pressure and temperature, and in the boiler feed water flow rate on the turbine extraction steam flow rate and power output changes. Dynamic simulation of a 600 MW supercritical power plant shows that the extraction steam flow changes play an important role in the longterm dynamics. 