500MW机组简化的非线性动态模型

A Simplified Non-Linear Dynamic Model of 500MW Unit

建立火电机组的简化模型,可以为控制系统的设计提供依据,也可以作为一个通用仿真平台用来评价各种控制算法的性能。针对机组负荷/压力对象,依据基本的质量平衡、容积平衡和能量平衡关系,采用机理分析和实验数据拟合相结合的方法,分析制粉过程、锅炉蓄热、过热器差压、汽轮机动态的特点,建立得到机组在大范围变工况运行下简化的非线性动态模型。模型采用机组稳定运行工况点的数据确定静态参数,利用汽轮机调门开度扰动和燃料量扰动实验确定动态参数。实验表明,模型能够反映机组主要的动态特性和非线性特性,具有很好的复现性。

The simplified non-linear unit model not only can provide the inherent rules by control system design, but also can be use as a simulation process to evaluate the performance of the control algorithms. After analyses the complementally physics relationship: mass balance, volume balance and energy balance, the physics law research method combined with experimental data fitting method are adopt to analysis the mill process, boiler heat storage process, superheater pressure differential process, turbine dynamic. The simplified unit non-linear dynamic model then is constructed, which can run in large scale working point. The model static parameters are calculated by unit stable running operating point, and the model dynamic parameters are derived by turbine disturbance and fuel flow disturbance experiments. The simulation illustrates that this model can fit well with the practical unit dynamic and can truly express the key dynamic and non-linear characteristics.Figs 7 and refs 9.