600MW超临界机组简化非线性模型研究

Study on Simplified Nonlinear Model of 600-MW Supercritical Units

目前,在国内对超临界机组模型的研究中大多将其简化为一个传递函数矩阵,不能观测机组内部其他参数的动态特性。通过采用机理分析和参数辨识相结合的方法,建立了600 MW超临界机组的简化非线性模型,利用某600 MW"W"火焰超临界直流锅炉机组负荷变动试验运行工况点的数据确定模型动静态参数。通过对Simulink仿真结果与实际运行数据对比表明,该模型能够很好地反映机组的非线性动态特性,可用于"W"火焰锅炉超临界机组协调控制策略研究及动态特性分析,通过修正参数也可以用于其他超临界机组相关方面的研究。

So far,in most studies,the supercritical unit is simply modeled in the form of transfer function matrix,from which the dynamic characteristics of other internal parameters cannot be observed.In this paper,the simplified nonlinear model of a 600-MW supercritical unit is established with the combination of mechanism analysis and parameter identification method.The dynamic and static parameters of the model are determined based on the data obtained from load variation test of one 600-MW ＂W＂ flame supercritical once-through boiler unit.Comparison between the Simulink simulation results and actual operation curves shows that the new model reflects the nonlinear dynamic characteristics of the unit well and can be used to study the coordinated control strategy and dynamic characteristic analysis for the supercritical units with ＂W＂ flame furnace.By modifying some parameters,the model can be used for research on other related aspects of supercritical units as well.