关键词: 火电机组, 汽轮机, 调节门, 流量特性, 建模, 阀切换, 一次调频

Abstract: Aiming at the problems of load jump, valve jitter, poor load and primary frequency control qualities caused by the large function deviation between the real flow characteristics of the high-pressure governing valve and the theoretical setting values in DEH during the operation process, the linear model of governing valve opening-flow commands is established in sections based on dead-zone projection, and combing with the discretization formula of inlet-steam-quantity and valve switching, the characteristic functions are obtained in both single and sequence valve controls. At the end, the feasibility of the proposed method is verified by applying it on a 200-MW thermal power unit.

Key words: thermal power unit, steam turbine, governing valve, flow characteristic, modeling, valve switching, primary frequency regulation