汽轮机转速不等率对机组一次调频能力的影响

汽轮发电机组一次调频能力不稳定的现象较为普遍，严重地影响到电网运行的安全。结合华东电网的具体案例，分析指出造成机组一次调频能力不稳定的根本原因是汽轮机局部转速不等率差别过大；分析了影响汽轮机组局部转速不等率的主要因素，指出汽轮机局部转速不等率与需要响应的电网频差密切相关。以某600MW超临界汽轮机为例，给出配汽函数优化前后不同频差下的局部转速不等率随调节阀开度的变化曲线；研究结果可用于提升汽轮机的机网协调能力。

Influence of Turbine Droop on the Primary Frequency Control Capacity of Steam Turbine Units

The instability of primary frequency modulation of steam turbine units is not rare, and it affects the security of power grid operation seriously. The study on the specific case of East China power grid figures out the root cause of primary frequency control capacity instability of being the large turbine local droop. After analyzing the main factors influencing the turbine local droop, it is concluded that the turbine local droop is closely related to the corresponding power grid frequency deviation. A 600-MW supercritical steam turbine is taken as a case to generate the optimized local droop curve. The results can be used to enhance the capability of the turbine and power grid coordination of steam turbines.