660 MW超临界火电机组汽轮机及其调速系统精细化模型研究和应用

Research and Application of Refined Model for 660 MW Supercritical Thermal Power Unit Steam Turbine and Its Governing System

为了解决典型模型适用性差的问题,针对某660 MW超临界火电机组,通过优化调速系统模型,并考虑机组流量特性和主蒸汽压力变化对一次调频特性的影响,搭建了汽轮机及其调速系统的精细化数学模型。采用典型模型和精细化模型对机组20%,40%,50%额定负荷下的一次调频响应过程进行仿真,将仿真结果与实测数据进行对比。结果表明:在不同工况下,精细化模型能更准确地反映机组一次调频功率的响应特性、机组流量指令响应特性和主蒸汽压力响应特性,并提出判断模型是否能正确反映机组一次调频特性的原则,对汽轮机及其调速系统模型的优化和改进具有一定的指导意义。

In order to solve the problem of poor applicability of typical models,a refined mathematical model of the steam turbine and its speed control system was established for a 660 MW supercritical ther⁃mal power unit by optimizing the speed control system model and considering the impact of unit flow char⁃acteristics and main steam pressure changes on the primary frequency control characteristics.The primary frequency regulation response process of the unit at 20%,40%and 50%rated load was simulated using typical and refined models,and the simulation results and the measured data were compared.The results show that under different operating conditions,the refined model can more accurately reflect the response characteristics of the unit′s primary frequency regulation power,unit flow command response characteris⁃tics and main steam pressure response characteristics.The principle of judging whether the model can correctly reflect the unit′s primary frequency regulation characteristics is proposed,which has a certain guiding significance for the optimization and improvement of the turbine and its speed control system model.