过热蒸汽温度的稳定控制是火电机组安全、经济运行的重要指标。本文分析了1 000 MW火电机组负荷变化对过热汽温的影响机理，指出了传统过热串级控制方法的局限性，设计了串级与精确前馈相结合的控制策略，并给出了前馈控制器的工程整定及其在线修正方法。工程应用效果显示：与单纯串级控制方法相比，串级与精确前馈相结合的控制策略对过热器控制效果更具有效性。

The stable control of the superheated steam temperature is an important indicator for the safety and economic operation of thermal power units. This paper analyzes the influence mechanism of 1 000 MW thermal power unit load change on the superheated steam temperature, points out the limitations of the traditional superheated cascade control method, designs a control strategy combining cascade and precise feed forward, and gives the engineering setting and its online correction method of a feed forward controller. The engineering application effect shows that compared with the pure cascade control method, the control strategy combining cascade and precise feed forward is more effective for the superheater control effect.

TK26;TK323

浙江省火力发电高效节能与污染物控制技术研究重点实验室开放基金（HLFD-OP-2021-01）；国家重点研发计划项目（2017YFB0902101）