超（超）临界机组高加给水旁路调节方式的一次调频控制技术研究与试验

基于某1 050 MW超超临界机组高压加热器给水旁路的工程实施,介绍了给水旁路调节方式下,多种调频手段共同参与的机组最大一次调频能力试验,获得了该机组给水旁路设计规模下的调频特性和多种调频方式下的调频效果对比分析。针对给水旁路下机组的负荷响应特性、省煤器进出口给水温降及其蓄热利用效率,开展给水旁路参与一次调频运行边界条件探讨。提出了一种超（超）临界机组的节能型一次调频控制方法,为挖掘超（超）临界机组蓄热潜力提供了试验依据,为特高压受端电网下超（超）临界发电机组一次调频能力提升提供探索路线。

Research and Test of the Primary Frequency Control in Ultra-Supercritical Units Under Feed Water Bypass Control of HP Heater

Based on the implementation of the feed water bypass of the HP heater in a 1 050 MW ultra-supercritical power unit, this paper introduces the primary frequency test at the maximum regulating capacity under the feed water bypass control mode. In the test, the characteristics of feed water bypass control regulation at the designed value are obtained and compared with those of combined regulation methods. According to the load response characteristics, the feed water temperature falling of the economizer inlet and outlet and the utilization efficiency of the boiler thermal storage, the boundary conditions of the primary frequency regulation operation are discussed under the feed water bypass control mode. At last the energy-saving hybrid frequency modulation scheme is proposed for the ultra- supercritical unit. The study results provide experimental evidence for excavating the regenerative potential of the ultra-supercritical unit and for the exploration of the primary frequency modulation capability enhancement of the ultra-supercritical power generation unit in the UHV receiving end power grid.