火电机组一次调频功率响应特性精细化建模

由于火电机组的功率响应具有较强的非线性特性，常规线性模型难以精确反映机组实际的一次调频响应特性。通过分析汽轮机阀门流量特性、主汽压力等关键因素对机组一次调频功率响应特性影响，引入阀门流量特性和主汽压力耦合函数、主汽压力模型和调节级压力-负荷动态转换系数，在典型汽轮机模型基础上构建火电机组一次调频功率响应特性精细化模型。结合某660 MW超临界机组的一次调频试验对所建立模型的性能进行验证。结果表明，与常规模型相比，新模型能够更好地反映实际机组的一次调频功率响应特性。

Refined Modeling for Power Response Characteristic of Thermal Power Unit under Primary Frequency Control

Due to the strong-nonlinearity characteristics of the power response of thermal power units, it is difficult to represent the practical power characteristics precisely in terms of the typical linear model. In this paper, through the analysis of the impacts of key factors such as the discharge characteristics of steam turbine valves and throttle pressure on the power response characteristics under primary frequency control, the steam turbine’s valve discharge characteristic and throttle pressure coupling function are introduced as well as the throttle pressure model and the dynamic conversion factor between first stage pressure and load. Then the refined model of power response under primary frequency control is established based on the typical steam turbine model. Finally, the performance of the established model is validated in combination with the primary frequency control test on an actual 660 MW supercritical unit. The results indicate that compared with the typical model, the proposed model demonstrates higher accuracy regarding the power characteristics under primary frequency control.